ADC/DAC
製品 (2518)
AD7878LN - 12-Bit 100kHz ADC with DSP Interface | Analog Devices
The Analog Devices AD7878LN is a complete 12-bit, 100 kHz sampling analog-to-digital converter (ADC) with an integrated 8-word FIFO and DSP interface, housed in a 28-pin PDIP (N-28) through-hole package. It integrates a track-and-hold amplifier with 2 microsecond acquisition time, a 7 microsecond successive-approximation ADC core, a 3 V internal Zener reference, and the FIFO plus control logic for direct connection to high-speed DSP processors. The part achieves 72 dB SNR at 10 kHz input and is specified over the commercial 0 to +70 C temperature range, making it a classic LC2MOS data-acquisition front end. A successive-approximation register (SAR) ADC is a deterministic, sample-by-sample converter that compares the held input against an internal binary-weighted DAC using a precision comparator. SAR ADCs deliver deterministic latency, no pipeline delay, excellent DC linearity, and inherently strong anti-alias behavior when paired with an external analog filter, which is why they remain the preferred topology for multiplexed data-acquisition systems and DSP front ends where each conversion result must arrive on a known clock edge. Key features of the AD7878LN include 12-bit resolution with no missing codes, a maximum 100 kHz throughput, integrated track/hold with 2 microsecond acquisition, on-chip 3 V reference, an 8-word deep FIFO that decouples conversion timing from DSP read timing, and a DSP-friendly parallel interface. The wide digital host compatibility spans the ADSP-2100, TMS320, and DSP56000 families, allowing the part to drop into a range of signal-processing designs without glue logic. The device operates from a single +5 V analog supply plus a separate +5 V digital supply, providing isolation between the analog input chain and the noisy DSP bus. The architecture minimizes digital feedthrough into the analog front end and supports unipolar 0 to +5 V input ranges, simplifying signal conditioning for transducer and process-control signals. Typical applications include DSP-based data acquisition front ends, process control and industrial instrumentation, motor control feedback sampling, multiplexed analog input subsystems, and portable or bench-top test equipment that requires deterministic 100 kHz sampling with a fast DSP read path. The integrated FIFO is particularly valuable when the DSP must service interrupts or run real-time algorithms without losing samples. When designing with the AD7878LN, allocate board area for a 1 microfarad decoupling cap on each analog supply pin and place the analog input trace away from the parallel digital bus to limit coupling. Because the part is a through-hole 28-pin PDIP, it is best suited for prototype, instrumentation, and legacy industrial designs rather than high-density SMT assemblies; for SMT equivalents in the same family see the alternatives section.
AD7887ARZ-REEL - 12-Bit 125kSPS 2-Ch SAR ADC | Analog Devices
The Analog Devices AD7887ARZ-REEL is a 12-bit successive-approximation-register (SAR) analog-to-digital converter (ADC) capable of 125 kSPS throughput from a single 2.7 V to 5.25 V supply. It offers 1 or 2 analog inputs, an integrated 2.5 V internal reference, and a high-speed SPI/QSPI/MICROWIRE/DSP-compatible serial interface. The part is supplied in an 8-lead SOIC (0.154 inch, 3.90 mm body width) and ships in a 2,500-piece Tape & Reel package, marked with the Z (lead-free, RoHS) finish. An ADC is a data converter that maps a continuous analog input voltage onto a discrete binary codeword. The 12-bit resolution means each LSB equals the full-scale range divided by 4096 - giving ~0.024% of FS step size and enabling precise measurement of low-bandwidth signals such as sensor outputs, motor currents, and instrumentation front-ends. Within the broader converter family, SAR ADCs excel where low latency, deterministic sampling, and excellent DC linearity are required, sitting between flash (fastest, lowest resolution) and sigma-delta (highest resolution, slowest) architectures. Key features of the AD7887 include a 500 ns input track-and-hold acquisition window, single-ended sampling architecture, straight-binary output coding, and a low-power CMOS process that consumes only a few milliwatts at full throughput. The serial interface can be operated from a single 3 V or 5 V supply, and dual-/single-channel mode is selectable through the on-chip control register. Power-down modes between conversions further reduce quiescent current to microamp levels, making the device attractive for battery and portable designs. Architecture-wise, the AD7887 combines a charge-redistribution DAC, a high-speed comparator, and an internal 2.5 V bandgap reference. The internal reference can be applied externally via the AIN1/VREF pin in single-channel mode, eliminating the need for an external reference IC and saving both cost and PCB area. Typical applications include industrial process control loops, portable and battery-powered instrumentation, motor-control current sense, optical sensor front-ends (e.g., photodiode signal conditioning), and general-purpose data acquisition in PLC and embedded systems. When designing with this device, bypass VDD with a 0.1 uF ceramic capacitor placed within 5 mm of the pin and keep the analog input trace short and guarded from digital switching nodes. The internal reference needs at least a 1 uF external decoupling capacitor on the REFCAP pin for the 2.5 V reference to settle within datasheet limits. This page synthesizes distributor pricing, pin-compatible drop-in alternatives, and practical PCB/thermal notes that go beyond the AD7887 datasheet standalone.
AD7888ARZ-REEL - 12-Bit 125kSPS 8-Ch Micropower ADC | ADI
The Analog Devices AD7888ARZ-REEL is a 12-bit, 8-channel, successive-approximation-register (SAR) analog-to-digital converter that operates from a single 2.7V to 5.25V supply and delivers up to 125 kSPS throughput in a 16-pin SOIC_N (R-16) surface-mount package, supplied on a 13-inch tape-and-reel. The part features eight single-ended analog inputs (AIN1 through AIN8), an on-chip 2.5V reference accessible at REF IN/REF OUT, and a high-speed serial interface compatible with SPI, QSPI, MICROWIRE, and most DSP serial ports. The input track-and-hold acquires a signal in 500 ns, supporting accurate sampling of fast-changing single-ended signals. An SAR ADC is a type of data converter that uses a binary-search successive-approximation algorithm to digitize an analog input, producing one sample per conversion cycle without the latency of pipelined or sigma-delta architectures. The AD7888 belongs to the SAR sub-family of analog-to-digital converters, which sits under the broader ADC category within data-converter ICs in the signal-chain block of mixed-signal systems. Low-power CMOS construction keeps typical dissipation at 2 mW during normal operation and only 3 uW in full power-down mode, making the part well-suited to battery-powered monitoring applications. Key features of the AD7888ARZ-REEL include a flexible reference arrangement (internal 2.5V reference or external 1.2V to VDD reference via the REF IN/REF OUT pin), a shutdown pin that drops quiescent current to microamp levels between conversions, and guaranteed operation over the -40C to +105C automotive-industrial temperature range. The wide supply range and simple SPI-compatible serial interface also ease integration with microcontrollers and DSPs that lack parallel ADC ports. Architecturally, the AD7888 uses a charge-redistribution DAC array with a sample-and-hold on each channel select, an internal oscillator that can be overdriven by an external clock for deterministic conversion timing, and automatic power-down between conversions to extend battery life. The 8 single-ended inputs share one ADC core, so channel switching is handled through the on-chip analog multiplexer; this keeps the package pin count to 16 while still serving multi-channel data-acquisition tasks. The serial interface supports daisy-chaining of multiple AD7888 devices for systems that need more than 8 channels. Typical applications include portable and battery-powered data acquisition, multi-channel sensor monitoring (temperature, pressure, strain, flow), industrial process control front ends, instrumentation and panel meters, and automotive sensor interfaces. Designers should pay particular attention to reference decoupling and analog-input filtering: place a 0.1 uF ceramic close to REF IN/REF OUT and a small RC network on each AIN to limit broadband noise that would otherwise degrade the converter's SNR. This page consolidates distributor pricing, 8-channel SAR alternative selections, and practical design notes that go beyond the manufacturer datasheet.
AD7888BR-REEL - 12-Bit 125 kSPS 8-Ch SAR ADC | Analog Devices
The Analog Devices AD7888BR-REEL is a high-speed, low-power, 12-bit successive-approximation analog-to-digital converter (SAR ADC) that operates from a single 2.7 V to 5.25 V power supply. Packaged in a 16-pin SOIC and shipped on a 13-inch tape-and-reel carrier, this micropower ADC achieves a 125 kSPS throughput rate while consuming only 2 mW typical power at 3 V, with a power-down current of 1 µA. A SAR ADC is a type of analog-to-digital converter that uses a binary-search successive-approximation algorithm to digitize an analog input in N conversion cycles for an N-bit code. SAR ADCs sit within the broader hierarchy of data converters (ADC -> Nyquist-rate ADC -> SAR ADC -> mixed-signal IC -> semiconductor). They are valued for low-latency conversions, deterministic behavior, and excellent DC accuracy without pipeline delay, making them ideal for multiplexed channel sampling in embedded systems. Key features include 8 single-ended analog input channels (AIN1-AIN8), an input track-and-hold with 500 ns acquisition time, a serial interface compatible with SPI/QSPI/MICROWIRE/DSP, and an analog input range of 0 V to VREF. The AD7888 operates from a single supply and offers low power consumption, which makes it suitable for battery-powered and portable designs. The converter's throughput of 125 kSPS supports multichannel scanning applications such as sensor arrays and process control. The AD7888 uses an on-chip clock and reference input buffer; external VREF up to VDD is supported. The serial interface allows direct connection to most modern microcontrollers and DSPs without glue logic. The architecture also integrates channel-selection logic, so a single command initiates a conversion on the addressed channel and streams the 12-bit result. Typical applications include portable instrumentation, data acquisition systems, battery-powered monitoring, industrial process control, and sensor signal conditioning. The wide supply range (2.7 V to 5.25 V) simplifies integration with 3.3 V and 5 V MCUs. When designing with this part, place 0.1 µF decoupling capacitors close to AVDD and ensure the serial clock stays below the rated throughput to avoid data corruption. For multi-channel scanning, sequence channel switches between conversions to allow full settling of the input track-and-hold. This page combines verified distributor stock data, drop-in SOIC-16 alternative MPNs, and practical design guidance not always visible in the manufacturer datasheet, giving engineers a single reference for evaluation, sourcing, and PCB design.
AD7888BR-REEL7 - 12-Bit 125kSPS 8-Ch ADC SOIC-16 | ADI
The Analog Devices AD7888BR-REEL7 is a 12-bit successive-approximation analog-to-digital converter (ADC) offering 8 single-ended analog input channels, 125 kSPS throughput, and a serial SPI/MICROWIRE/QSPI-compatible interface, housed in a 16-pin SOIC_N package supplied on a 7-inch reel. It operates from a single 2.7 V to 5.25 V supply, includes an internal 2.5 V reference (or accepts an external REF input), and provides a power-down mode that drops supply current to under 1 µA for battery-aware designs. An ADC (Analog-to-Digital Converter) is a data-conversion IC that samples continuous analog voltage levels and translates them into discrete digital codes for microcontrollers, DSPs, or FPGAs. Within the converter hierarchy, the AD7888 sits in the SAR (successive-approximation register) sub-family of ADCs, characterized by deterministic latency and low power consumption compared to delta-sigma or pipeline architectures; it is itself part of the larger data-converter domain of mixed-signal ICs. Key features include a 500 ns input track-and-hold acquisition time, eight single-ended channels multiplexed to a single ADC core, a true analog input range of 0 V to VREF on each channel, daisy-chainable serial interface, and a hardware shutdown pin. The internal reference and channel sequencer reduce external component count, which is valuable in space-constrained sensor-interface PCBs. Technically, the AD7888 uses a charge-balancing DAC and a high-speed comparator inside its SAR loop to deliver 12-bit resolution without pipeline delay, making it well-suited to multiplexed applications that need deterministic per-channel conversion timing. Its low-power CMOS process keeps active current around 1 mA typical at full throughput. Typical applications include portable instrumentation, multi-channel sensor monitoring (temperature, pressure, strain-gauge bridges), battery-powered data loggers, and industrial process-control front ends where multiple slow-moving analog signals must be digitized by a single MCU. When designing with this device, ensure that the analog input pins are not driven above VDD or below GND, and add a 0.1 µF decoupling capacitor close to the supply pin to reduce digital-coupling noise on the analog sampling instant. This page synthesizes ADI-authorized datasheet data, current distributor pricing, and drop-in SOIC-16 cross-references so engineers can compare the AD7888 against modern pin-compatible ADCs in one place.
AD7890AN-2 - 8-Channel 12-Bit Serial ADC | Analog Devices
The AD7890AN-2 is an 8-channel, 12-bit data acquisition system from Analog Devices, integrating an input multiplexer, an on-chip track/hold amplifier, a high-speed 12-bit ADC, a 2.5 V reference, and a high-speed serial interface. It operates from a single 5 V supply and accepts an analog input range of 0 V to 2.5 V for the -2 version. The device is packaged in a 24-pin PDIP (N) package, suitable for through-hole mounting in industrial and instrumentation applications. A data acquisition system (DAS) is a complete signal chain that samples multiple analog signals, converts them to digital words, and transfers the data to a host processor. The AD7890AN-2 combines the multiplexer, track/hold, ADC, reference, and serial interface in a single IC, simplifying board design and reducing component count. It is part of the broader family of analog-to-digital converters (ADCs) used in industrial control, data logging, and medical monitoring systems. Key features include a fast 12-bit ADC with a 5.9 µs conversion time, eight single-ended analog input channels, and a serial interface that supports SPI-compatible communication. The on-chip 2.5 V reference eliminates the need for an external reference, while the track/hold amplifier ensures accurate sampling of dynamic signals. The device also allows separate access to the multiplexer and ADC, providing flexibility in system design. Technically, the AD7890AN-2 uses a successive approximation register (SAR) architecture, which offers a good balance of speed and power consumption. The 117 kSPS sampling rate is suitable for multi-channel monitoring applications where each channel is sampled sequentially. The serial interface reduces pin count and simplifies isolation in industrial environments. The device operates over the industrial temperature range of -40°C to +85°C. Typical applications include industrial process control, data acquisition systems, battery monitoring, and medical instrumentation. The 0 V to 2.5 V input range is ideal for sensors with unipolar outputs, such as temperature and pressure transducers. The serial interface allows easy connection to microcontrollers and DSPs. When designing with the AD7890AN-2, ensure that the analog input signals are within the specified range and that the reference is properly decoupled. The serial clock should be limited to the maximum specified frequency to ensure accurate data transfer. Consider using a low-pass filter on each analog input to reduce aliasing.
AD7890ANZ-10 - 8-Channel 12-Bit Serial DAS | Analog Devices
The AD7890ANZ-10 is an 8-channel, 12-bit serial data acquisition system (DAS) from Analog Devices, integrating an input multiplexer, an on-chip track/hold amplifier, a high-speed 12-bit ADC, a 2.5 V reference, and a high-speed serial interface. It operates from a single 5 V supply and accepts an analog input range of ±10 V for the -10 variant. The device is packaged in a 24-pin PDIP (ANZ suffix) and is designed for industrial temperature ranges from -40°C to +85°C. A data acquisition system (DAS) is a complete signal chain that samples multiple analog signals, converts them to digital, and interfaces with a microcontroller or DSP. The AD7890 integrates the multiplexer, track/hold, ADC, and reference into a single IC, simplifying design and reducing board space compared to discrete implementations. It belongs to the family of serial data acquisition systems, which are essential in industrial automation, process control, and instrumentation. Key features include a fast 12-bit ADC with 5.9 µs conversion time, eight single-ended analog input channels, and a serial interface compatible with SPI. The on-chip track/hold amplifier ensures accurate sampling of dynamic signals, while the internal 2.5 V reference eliminates the need for external reference circuitry. The multiplexer is independently accessible, allowing users to insert antialiasing filters or signal conditioning between the multiplexer and the ADC. The AD7890 uses LC2MOS technology, combining low power consumption with high-speed performance. The serial interface supports high-speed data transfer, and the device can be configured for various input ranges (0-2.5 V, 0-4.096 V, ±10 V) depending on the variant. The 24-pin PDIP package is suitable for through-hole assembly, providing ease of prototyping and robust mechanical connection. Typical applications include industrial process control, data logging, and multi-channel sensor monitoring. The AD7890ANZ-10 is ideal for systems requiring simultaneous sampling of multiple analog signals with 12-bit resolution and serial output for easy microcontroller interfacing. When designing with this device, ensure proper decoupling of the 5 V supply and careful layout of the analog input traces to minimize noise. The independent multiplexer access allows flexible signal conditioning, but the track/hold acquisition time must be considered for accurate sampling of high-frequency signals.
AD7890BR-4 - 8-Channel 12-Bit DAS | Analog Devices
The AD7890BR-4 is a complete, 8-channel, 12-bit data acquisition system (DAS) from Analog Devices, fabricated in LC2MOS technology. It integrates a fast 12-bit ADC with a 5.9 µs conversion time, an 8-channel multiplexer, an on-chip track/hold amplifier, and an on-chip reference. The device operates from a single 5 V supply and accepts an analog input range of 0 V to 4.096 V for the AD7890-4 variant. The multiplexer is independently accessible, allowing the user to insert an antialiasing filter or signal conditioning between the multiplexer and the ADC. The AD7890BR-4 is packaged in a 24-pin SOIC (narrow body) and communicates via a serial interface, making it ideal for industrial process control, data acquisition systems, and battery-powered instrumentation. A data acquisition system (DAS) is a complete signal chain that samples multiple analog signals, converts them to digital, and outputs the data to a processor. It typically includes a multiplexer, an ADC, a track/hold amplifier, and a reference. The AD7890BR-4 integrates these functions into a single IC, reducing board space and design complexity. In the hierarchy of signal chain components, a DAS sits above a standalone ADC, as it includes the multiplexer and reference, but below a full system-on-chip that might include a microcontroller. This integration is particularly valuable in multi-channel monitoring applications where space is constrained. Key features of the AD7890BR-4 include its 8 single-ended analog input channels, 12-bit resolution, and a serial interface that simplifies connection to microcontrollers and DSPs. The device offers a choice of input ranges: ±10 V (AD7890-10), 0 V to 4.096 V (AD7890-4), and 0 V to 2.5 V (AD7890-2). The on-chip track/hold amplifier ensures accurate sampling of fast-changing signals, while the on-chip reference eliminates the need for an external reference, saving cost and board area. The device operates over a temperature range of -40°C to +85°C, making it suitable for industrial environments. Technically, the AD7890BR-4 uses a successive approximation register (SAR) architecture, which provides a good balance of speed and resolution. The 5.9 µs conversion time corresponds to a maximum sample rate of approximately 117 kSPS when all channels are scanned sequentially. The serial interface is SPI-compatible, with a clock input and data output, allowing easy integration with most microcontrollers. The device also features a busy output that indicates when a conversion is in progress, simplifying synchronization. Typical applications include industrial process control, where multiple sensors need to be monitored; data acquisition systems for test and measurement; and battery-powered instrumentation, where the low power consumption and single-supply operation are advantageous. The AD7890BR-4 is also suitable for medical monitoring equipment and automotive test systems. When designing with the AD7890BR-4, ensure that the analog input signals are within the specified range and that adequate decoupling is provided on the power supply pins. The serial interface should be isolated if the system is subject to high noise, and the reference output should be buffered if driving external loads.
AD7892AR-1 - 12-Bit 500kSPS Bipolar SAR ADC | Analog Devices
The Analog Devices AD7892AR-1 is a 12-bit, 500 kSPS successive-approximation analog-to-digital converter (SAR ADC) in a 24-pin SOIC package with bipolar ±10 V (or 0 to +10 V) input range. It operates from a single +5 V supply, integrates an on-chip track/hold amplifier, an internal +2.5 V reference, and supports both serial and parallel interface modes, making the AD7892AR-1 a high-performance single-supply data-acquisition front end for industrial process controls and instrumentation. An ADC (analog-to-digital converter) is a data-converter integrated circuit that translates a continuous analog input voltage into a discrete digital code. Within the converter taxonomy, SAR (Successive Approximation Register) ADCs sit between high-speed flash ADCs and high-resolution delta-sigma ADCs, offering an attractive balance of speed (100 kSPS to multi-MSPS), resolution (12-18 bits), and low power. SAR converters are widely used in industrial control loops, motor-control current sensing, multichannel data-acquisition systems (DAS), and instrumentation where deterministic latency and excellent DC accuracy are required. Key headline specifications include 12-bit resolution, 500 kSPS throughput (1.47 µs conversion time using the internal clock), a single +5 V supply with bipolar ±10 V input range (selected via the R1 input), ±5 V or 0 V to +5 V alternative input options on other AD7892 grades, 60 dB typical SNR at 50 kHz input, low power dissipation of around 60 mW, and a parallel or serial digital interface. The bipolar input capability eliminates the need for external level-shift or negative-rail signal conditioning in many 4-20 mA, ±5 V sensor, and motor-current applications. The AD7892AR-1 uses an LC²MOS process with an on-chip buried-zener reference trimmed to ±10 mV initial accuracy, ensuring 12-bit performance without external reference components. The integrated track/hold amplifier handles input signals up to several hundred kHz, and the successive-approximation conversion delivers zero-pipeline latency, which simplifies closed-loop and oversampling applications. Typical applications for the AD7892AR-1 include industrial process control (4-20 mA loop digitization), AC motor-control current and voltage sensing, instrumentation and data-acquisition systems, battery-cell monitoring, and CCD image processing. The combination of bipolar input and single +5 V supply simplifies analog front-end designs. When designing with the AD7892AR-1, pay close attention to the input-protection network - a small series resistor and clamping diodes limit fault currents during over-voltage transients, as recommended in the AD7892 datasheet. Buffer the signal source with a low-impedance driver to preserve AC performance at high input frequencies. This page synthesizes distributor pricing, drop-in package-compatible alternatives, and design notes for the AD7892AR-1 that go beyond the manufacturer datasheet, including cross-brand Bipolar SAR ADC equivalents and same-grade ADI AD7892 family pin-compatibles.
AD7892AR-1REEL - 12-Bit 500kSPS SAR ADC | Analog Devices
The Analog Devices AD7892AR-1REEL is a 12-bit, 500 kSPS successive-approximation analog-to-digital converter that operates from a single +5 V supply and is offered in a 24-pin SOIC wide-body package (tape and reel packaging). The part integrates a 1.47 µs SAR ADC core, an on-chip track/hold amplifier, an internal +2.5 V reference, and versatile serial/parallel interface logic, enabling direct connection to microcontrollers, DSPs, and high-speed data acquisition ASICs. An ADC (analog-to-digital converter) is a mixed-signal semiconductor that translates real-world analog voltages into discrete digital codes for processing by microcontrollers, DSPs, or FPGAs. Within the data-converter hierarchy, SAR (successive-approximation register) ADCs sit between flash converters and sigma-delta ADCs in speed and resolution: they offer 8-18 bits of resolution with 0.1-10 MSPS throughput and low latency, making them the workhorse for multiplexed control loops, instrumentation, and motor control. The AD7892 family belongs to this SAR category and is further classified as a bipolar-input, single-supply precision ADC for industrial measurement applications. Key specifications include 12-bit resolution (no missing codes), 500 kSPS throughput (the AD7892-1 grade; the AD7892-3 grade reaches 600 kSPS), bipolar ±5 V or ±10 V analog input range, ±5 V single-supply operation, internal 2.5 V reference, and 1.47 µs ADC conversion time. The 24-pin SOIC wide-body package offers 0.295 inch (7.50 mm) body width and operates from -40 °C to +85 °C ambient, suitable for industrial environments. Architecturally, the converter combines a high-speed comparator, charge-redistribution DAC array, and successive-approximation register clocked from an internal oscillator. The on-chip track/hold front-end settles in ~150 ns, allowing full throughput at the rated 500 kSPS without external buffering for many sensor signals. Typical applications include industrial process control, motor control feedback loops, multi-channel data acquisition systems, instrumentation front-ends, and precision transducer signal conditioning. Design engineers select the AD7892-1 when bipolar input range and single-supply operation are required in a compact analog front-end.
AD7892ARZ-2REEL - 12-Bit 500kSPS Single-Supply ADC | ADI
The Analog Devices AD7892ARZ-2REEL is a 12-bit successive-approximation analog-to-digital converter operating from a single +5 V supply with a 500 kSPS throughput rate, housed in a 24-pin SOIC wide-body package supplied on a 7-inch reel. The AD7892 integrates a 1.47 µs SAR ADC core, an on-chip track-and-hold amplifier, an internal +2.5 V reference, and versatile parallel or serial interface logic on a single die, allowing system designers to replace multi-chip discrete ADC solutions with one compact part. The AD7892-2 variant specified by the -2 speed grade pin straps its analog input range to either 0 V to VREF or ±10 V operation, with self-calibration on power-up providing ±1 LSB max linearity error. A successive-approximation register (SAR) ADC is a precision data converter that resolves an analog input to a digital code in N clock cycles using a binary-search algorithm. SAR ADCs are favored over delta-sigma and pipeline types when applications need deterministic latency, low latency per conversion, and excellent DC linearity at moderate-to-high sampling rates. Within the broader signal-chain hierarchy, the SAR ADC sits between general-purpose data converters and precision instrumentation; AD7892 specifically targets single-supply, low-power industrial and instrumentation systems where bipolar input ranges are required without a negative rail. Key features include 500 kSPS throughput in the -2 grade, 1.47 µs conversion time, on-chip +2.5 V reference with low drift, input range pin-strapping for 0-VREF or ±10 V operation, and 60 mW typical power dissipation from a single +5 V supply. Fabricated in ADI's LC2MOS process that mixes precision bipolar input stages with low-power CMOS logic, the AD7892 achieves low power without sacrificing analog input accuracy. Interface options include high-speed parallel or two-wire serial output, allowing the same silicon to serve memory-mapped microcontroller buses or low-pin-count DSP serial ports. Typical applications include industrial process control loops, portable battery-powered instrumentation, motor control current sensing, and DSP front-end data acquisition. The on-chip reference and single +5 V supply simplify system BOM and reduce PCB area, while the ±10 V input range option makes the part suitable for legacy ±12 V industrial signal paths when powered from a single +5 V rail via input attenuation. Designers should note that the -2 grade throughput is 500 kSPS versus the -3 grade's 600 kSPS, and the -1 grade offers single-ended rather than dual analog inputs. For thermal management, the 24-pin SOIC plastic package combined with 60 mW typical dissipation requires only standard PCB thermal practice. The internal reference decouples design effort from external reference selection; bypass with the recommended capacitor network per the datasheet to minimize conversion noise. The reel-packaged -REEL suffix denotes 7-inch tape and reel for high-volume SMT assembly. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the standalone manufacturer datasheet.
AD7892BR-1 - 12-Bit 500kSPS Bipolar ADC | Analog Devices
The Analog Devices AD7892BR-1 is a 12-bit, 500 kSPS successive-approximation analog-to-digital converter that operates from a single +5 V supply. The part contains a 1.47 µs SAR ADC, an on-chip track/hold amplifier, an internal +2.5 V reference, and versatile parallel or serial interface structures for direct microprocessor connection. It is offered in a 24-pin SOIC wide-body (0.295", 7.5 mm) package and accepts bipolar analog input ranges including true bipolar ±10 V or ±5 V (model dependent) via the AD7892-1 input scaling network. What is a SAR ADC? A successive-approximation register analog-to-digital converter is a sampling data converter that performs bit-by-bit decision against an internal DAC to converge on the input voltage. In the broader taxonomy, the AD7892 sits as: ADC -> data converter -> signal chain IC -> mixed-signal semiconductor. SAR ADCs trade raw speed for deterministic latency and excellent DC accuracy, making them the dominant architecture for 12-/14-/16-bit precision instrumentation at sample rates from 100 kSPS to 10 MSPS. Key features include ±17 V overvoltage protection on analog inputs (AD7892-1/2/3 variants), single-supply +5 V operation, an on-chip 2.5 V reference (or external reference option), choice of parallel 12-bit word or serial data output formats, and low power consumption of approximately 60 mW typical at 500 kSPS. The bipolar input stage on AD7892-1 extends usable dynamic range for industrial transducer signals that swing around ground. Architecturally, the AD7892BR-1 combines a high-impedance input attenuator, a fast track/hold, the SAR core clocked by an internal oscillator, and an internal 2.5 V bandgap reference. The single-supply bipolar topology uses input resistor scaling and level shifting so that the internal ADC core always sees a 0 V to 2.5 V (or 0 V to 5 V) unipolar signal — a classic Analog Devices LC2MOS approach that predates modern pin-compatible CMOS ADCs. Typical applications include industrial process control data acquisition, motor control current/voltage sensing, instrumentation front-ends, and medical monitoring signal chains where bipolar ±10 V inputs must be digitized directly without external signal conditioning. It is also used in test-and-measurement equipment and DSP front-end digitization. When designing with the AD7892BR-1, ensure the analog input is properly buffered because the input attenuator presents a relatively high source impedance that interacts with sample-rate-dependent acquisition time. Decouple VDD with 10 µF tantalum in parallel with 100 nF ceramic placed within 5 mm of the supply pin; do not share digital and analog ground returns under the package. This page synthesizes distributor pricing and cross-reference findings not presented in the datasheet, focusing on practical guidance rather than parameter repetition.
AD7892BR-1REEL - 12-Bit 500kSPS Bipolar SAR ADC | Analog Devices
The Analog Devices AD7892BR-1REEL is a 12-bit successive-approximation analog-to-digital converter (SAR ADC) offering 500 kSPS throughput with bipolar analog input operation from a single +5 V supply, housed in a 24-pin SOIC package (300 mil body width) and shipped on tape-and-reel. The -1 input variant accepts a ±5 V or ±10 V bipolar analog input range (device-grade dependent) and provides both serial and parallel digital output interfaces, allowing direct connection to microprocessors, microcontrollers, and digital signal processors with no external glue logic. Internal blocks include a track-and-hold amplifier, a +2.5 V buried-Zener reference, and a high-speed successive-approximation register core that completes a full conversion in 1.47 µs. A SAR (successive-approximation register) ADC is a class of Nyquist-rate converter that uses a binary-search algorithm against an internal DAC to determine each bit of the output, one decision per clock cycle. SAR ADCs sit in the data-converter hierarchy between flash converters (fastest, lowest resolution) and sigma-delta ADCs (highest resolution, lower bandwidth). The AD7892 belongs to the integrated data-acquisition IC family, which combines the converter, reference, and interface logic on a single CMOS die, simplifying the BOM for industrial and instrumentation designs. Key specifications include 12-bit resolution, 500 kSPS sampling rate (AD7892-1/AD7892-2 grade), 1.47 µs conversion time, single +5 V supply operation, ±10 V bipolar analog input range, internal +2.5 V reference, and low power dissipation of approximately 60 mW. The serial interface operates up to the full conversion rate and can be configured for word-mode operation, while the parallel interface provides fast bus access times suitable for direct connection to standard microprocessors. Typical applications include industrial process control, instrumentation, signal monitoring, motor control current/voltage sensing, and data acquisition front-ends requiring a bipolar-input ADC. The bipolar input range eliminates the need for external signal-conditioning amplifiers in many ±5 V or ±10 V instrumentation environments, reducing both BOM cost and board area. When designing with the AD7892BR-1REEL, allow sufficient settling time at the analog input pins and place the power-supply decoupling capacitors as close to the AVDD and DVDD pins as possible to achieve the rated linearity performance.
AD7893ACHIPS-2 - 12-Bit, 117 kSPS ADC | Analog Devices
The Analog Devices AD7893ACHIPS-2 is a 12-bit successive-approximation analog-to-digital converter (ADC) specified for ±10 V input range with 117 kSPS throughput, supplied in a bare die / chip form (CHIPS suffix). The part is fabricated in Analog Devices' Linear Compatible CMOS (LC²MOS) mixed-technology process, combining precision bipolar analog circuits with low-power CMOS logic, and is offered in 8-pin plastic mini-DIP, 8-pin SOIC, and bare die (CHIPS) options. Single +5 V supply operation, low power dissipation, and an on-chip track/hold amplifier make the AD7893 suitable for high-density system designs. A successive-approximation ADC (SAR ADC) is a type of analog-to-digital converter that uses a binary-search algorithm to digitize an analog input. Each conversion takes one clock cycle per bit of resolution, so a 12-bit SAR ADC produces one sample in 12 conversion clock periods. SAR ADCs offer deterministic latency, no pipeline delay, and excellent DC accuracy, making them the dominant choice for multiplexed data acquisition systems, industrial process control, and instrumentation front-ends where both high accuracy and fast single-shot response are required. The AD7893 family sits in the product hierarchy: ADC -> data converter -> signal chain IC -> mixed-signal semiconductor. Key specifications include 12-bit resolution, 117 kSPS maximum sampling rate (model -2 variant), ±10 V analog input range, single +5 V supply, low power dissipation, and an on-chip track/hold. The CHIPS suffix denotes the bare die / wafer form intended for hybrid module assembly, multi-chip modules, and applications requiring a smaller footprint or hermetic packaging beyond what the 8-pin mini-DIP / SOIC plastic parts can offer. The die is qualified to Analog Devices' standard commercial operating temperature range and is shipped in waffle packs or Gel-Pak carriers. The AD7893 architecture uses a capacitive charge-redistribution DAC core, a high-speed comparator, and a successive-approximation register, all clocked by an internal oscillator that can be overdriven by an external clock for precise sampling-rate control. This architecture delivers true 12-bit linearity, ±1 LSB maximum INL/DNL (typical), and low input capacitance, simplifying front-end drive requirements. Typical applications include industrial process control and PLC analog input modules, multi-channel data acquisition systems on PC/104 and CompactPCI boards, medical instrumentation front-ends, and avionics / military signal-conditioning modules where the bare-die form is preferred for size, weight, or hermeticity reasons. When designing with the AD7893ACHIPS-2, the user is responsible for die attachment, wire bonding, and package-level ESD protection - the bare-die option is intended for hybrid assembly houses with MCM/COB capability, not for hand-soldered prototypes. A proper anti-aliasing filter must precede the analog input to avoid fold-back of out-of-band noise. This page synthesizes distributor pricing, parametric specifications, drop-in alternatives, and practical design notes for the AD7893ACHIPS-2 not found on a typical distributor listing.
AD7893AR-10REEL - 12-Bit 6µs SAR ADC | Analog Devices | SOIC-8
The Analog Devices AD7893AR-10REEL is a 12-bit successive-approximation analog-to-digital converter (SAR ADC) with a 6 µs conversion time, offered in an 8-pin SOIC package and supplied on a 13-inch reel. The part operates from a single +5 V supply, accepts a bipolar ±10 V analog input range, and includes an on-chip track-and-hold amplifier plus a high-speed serial interface that simplifies board routing in space-constrained designs. A SAR ADC is a type of analog-to-digital converter that performs conversions using a binary-search algorithm controlled by an internal successive-approximation register. Within the broader data-converter hierarchy, SAR converters sit between flash ADCs (fast, expensive, low resolution) and sigma-delta ADCs (high resolution, lower bandwidth). SAR ADCs are widely used in industrial control, instrumentation, and process automation where mid-bandwidth 12- to 16-bit conversions with deterministic latency are required. The defining feature of the AD7893 family is its LC2MOS (Linear-Compatible CMOS) process, which integrates precision bipolar analog circuitry with low-power CMOS logic on a single die. This process delivers 12-bit accuracy with no missing codes and reliable operation over the industrial -40 °C to +85 °C temperature range. The on-chip track/hold front end handles full-scale transients between conversions without an external buffer, and the serial data output reduces pin count versus parallel-output ADCs of equivalent resolution. In system architecture, the AD7893 typically sits between sensor signal-conditioning circuitry and a microcontroller, DSP, or FPGA that consumes the serial data stream. Its single-supply ±10 V input option simplifies front ends that previously required bipolar analog rails, and the 6 µs conversion time supports multiplexed multi-channel scanning at reasonable per-channel sample rates. Power consumption is approximately 25 mW during conversion, making the part attractive for portable battery-powered instrumentation and motor-control feedback loops. Typical applications include industrial process control data acquisition boards, motor-speed and position feedback loops, portable medical instrumentation, multi-channel data loggers, and precision sensor signal chains. The 8-pin SOIC footprint saves board area versus larger pin-count parallel ADCs and fits easily on mixed-signal PCBs that already carry an MCU. When designing with this part, observe the analog-input common-mode range, place a 0.1 µF decoupling capacitor close to the supply pin, and route the serial clock and data lines away from the analog input traces to minimize digital feedthrough. The device is being phased out by Analog Devices, so designers should plan a second source or migration strategy. This page consolidates distributor pricing, drop-in cross-reference information (including active alternatives such as AD7893ARZ-10REEL7), and practical design notes that complement the manufacturer datasheet.
AD7893AR-2REEL7 - 12-Bit 6µs Serial ADC | Analog Devices
The Analog Devices AD7893AR-2REEL7 is a 12-bit successive-approximation analog-to-digital converter (SAR ADC) with a 6µs conversion time, fabricated in Analog Devices' LC2MOS process and housed in an 8-pin SOIC package. It accepts a bipolar input range of ±10V while operating from a single +5V supply, and integrates an on-chip track/hold amplifier, on-chip clock, and a high-speed two-wire serial interface that delivers output data at up to 117 kSPS. A successive-approximation ADC is a converter architecture that uses a binary-search algorithm across an internal DAC to converge on the input voltage in N clock cycles, where N is the resolution in bits. The SAR architecture is favored for multiplexed data acquisition, motor control feedback loops, and instrumentation because it provides deterministic latency, low latency (single-cycle conversion), and excellent DC accuracy with no pipeline delay. The AD7893AR-2 sits in the broader data-converter taxonomy: ADC -> SAR ADC -> 12-bit ADC -> single-channel serial ADC -> precision data-acquisition IC. Its bipolar ±10V input on a +5V rail is achieved through on-chip input attenuation that allows the part to digitize industrial-level signals without external resistor dividers. Key features include AC and DC specifications such as ±1 LSB INL (typical), 70 dB SNR (typical, with input signal near full scale), and a fast 6µs conversion time that supports sampling rates up to 117 kSPS. The single +5V supply and two-wire serial interface reduce pin count to 8, simplifying board layout in space-constrained designs. The on-chip track/hold amplifier eliminates the need for an external sample-and-hold, reducing BOM cost and analog front-end complexity. Operating from -40°C to +85°C industrial temperature range and supplied on a 7-inch reel (REEL7) for high-volume assembly. Architecturally, the AD7893 uses a capacitive-charge-redistribution DAC core (LC2MOS) that delivers low power dissipation, typically 25 mW, plus a precision comparator and SAR register. The two-wire serial interface is compatible with most popular microcontrollers and DSPs, supporting read-only serial data transfer that allows direct connection to SPI, QSPI, and MICROWIRE ports with minimal glue logic. The integrated clock eliminates external timing components and ensures deterministic 6µs conversion regardless of MCU speed. Typical applications include industrial process control front-ends, data-acquisition boards for PLCs and measurement instruments, motor-control current/voltage monitoring, portable instrumentation that needs bipolar ±10V input on a single supply, and medical monitoring equipment requiring 12-bit resolution. The small 8-pin SOIC footprint makes the device attractive for high-density PCB layouts where 12-bit accuracy, bipolar input range, and serial output are simultaneously required. A key design consideration is that the analog input pin must be driven by a low-impedance source or buffered op-amp; the AD7893's input sampling architecture draws transient charge that can degrade linearity if the source impedance exceeds specification. Decouple VDD with a 0.1µF ceramic capacitor placed within 5 mm of the supply pin, and route the analog input trace over a continuous ground plane to minimize conversion noise. The REEL7 suffix indicates the part is shipped on a 7-inch reel (1,000-piece reel) suitable for high-volume automated pick-and-place assembly. This page synthesizes distributor pricing, drop-in same-brand and cross-brand alternatives, and practical design notes not consolidated in the manufacturer datasheet.
AD7893ARZ-10REEL - 12-Bit 117 ksps Serial ADC, 8-SOIC | Analog Devices
The Analog Devices AD7893ARZ-10REEL is a fast 12-bit successive-approximation analog-to-digital converter (SAR ADC) that operates from a single +5 V supply and is housed in an 8-pin SOIC package. It delivers a conversion time of 6 us and supports a throughput rate of 117 ksps, with a bipolar input range of -10 V to +10 V (the -10 suffix designates this input span). The device integrates an on-chip track-and-hold amplifier, an on-chip clock, and a high-speed serial interface, eliminating most external analog components and simplifying layout. What is a SAR ADC? A successive-approximation-register ADC is a precision data converter that uses a binary-search algorithm and an internal DAC to digitize an analog input one bit at a time. Within the broader hierarchy, a SAR ADC belongs to the ADC family, which in turn sits under data converters (ADC/DAC), mixed-signal ICs, and ultimately the broader semiconductor category. SAR ADCs are valued for their deterministic latency, low power, and excellent DC accuracy, making them a default choice for industrial process control, instrumentation, and precision monitoring. Key features of the AD7893 include 12-bit resolution with no missing codes, typical linearity of +/-1 LSB, low power consumption of approximately 25 mW, and an operating temperature range of -40C to +85C. The device is fabricated in Analog Devices' Linear Compatible CMOS (LC2MOS) mixed-signal process, which combines precision bipolar circuits with low-power CMOS logic to deliver accurate conversions with low power dissipation. The integrated track-and-hold amplifier acquires bipolar input signals in under 1 us, allowing accurate digitization of fast-moving signals without external front-end conditioning in most applications. Typical applications include industrial process control, data acquisition systems, motor control feedback loops, instrumentation, and battery-powered portable measurement equipment. The wide +/-10 V input range makes the part well-suited to industrial signal levels directly off sensors and transducers, while the serial interface reduces pin count and isolates noisy digital switching from the analog input path. When designing with the AD7893ARZ-10REEL, place decoupling capacitors (typically 10 uF tantalum in parallel with 0.1 uF ceramic) as close as possible to the supply and reference pins. Keep the analog input traces short and guarded, and consider an RC input filter if the source impedance is significant. The SCLK and DOUT lines should be length-matched and routed away from noisy switching nodes to preserve conversion integrity. This page synthesizes distributor pricing, drop-in alternatives, and design considerations not found on the manufacturer datasheet alone.
AD7893ARZ-2REEL - 12-Bit 117 kSPS Serial ADC | Analog Devices
The Analog Devices AD7893ARZ-2REEL is a 12-bit successive-approximation analog-to-digital converter (SAR ADC) that operates from a single +5 V supply and is housed in an 8-pin SOIC (R-8) package on a 7-inch reel. The bipolar input range is +/-10 V (model suffix "-2") and the device delivers a throughput of 117 kSPS through a high-speed serial interface. An on-chip track-and-hold amplifier, on-chip clock and serial output stage make the part a compact solution for embedded data acquisition. A successive-approximation ADC is a type of analog-to-digital converter that performs a binary search against the input voltage using an internal DAC and comparator. Within the broader taxonomy, the AD7893 belongs to the successive-approximation register (SAR) ADC family, which sits inside the precision / data-converter class of mixed-signal integrated circuits and ultimately falls under data-converter ICs / signal-chain semiconductors. SAR ADCs are valued for their deterministic latency, lack of pipeline delay, and excellent DC accuracy, making them the preferred architecture for multiplexed precision measurement. The AD7893 is fabricated on Analog Devices' Linear Compatible CMOS (LC2MOS) process, a mixed-technology flow that combines precision bipolar input structures with low-power CMOS logic. The device specifies harmonic distortion and signal-to-noise ratio in addition to traditional DC accuracy parameters such as integral linearity error, full-scale error and offset error. A 6 microsecond conversion time and serial interface simplify galvanic isolation in industrial systems, while the +/-10 V true-bipolar input removes the need for external signal-conditioning scaling networks. Typical applications include industrial process-control analog front ends, motor-control current/voltage sensing, portable instrumentation, multi-channel data-acquisition boards, and power-supply monitoring where a single +5 V rail and serial output reduce opto-isolator channel count. Compared with parallel-output ADCs of equivalent speed, the AD7893's serial interface dramatically reduces the digital I/O count on the host microcontroller or DSP, which is particularly valuable in space-constrained isolated designs. This page synthesizes verified distributor pricing, drop-in same-package alternatives, and practical design notes that go beyond what the manufacturer datasheet alone provides.
AD7893BR-10REEL - 12-Bit 117kSPS Serial Bipolar ADC | Analog Devices
The Analog Devices AD7893BR-10REEL is a 12-bit successive-approximation analog-to-digital converter (SAR ADC) with a 117 kSPS sampling rate and a 6 microsecond conversion time, housed in an 8-pin SOIC package. The -10 speed grade operates from a single +5 V supply and accepts a true bipolar analog input range of +/-10 V, with the part family also available in +/-5 V input variants (AD7893AR-10) and 0 V to +5 V unipolar versions. The serial interface operates at high speed, allowing direct connection to most modern DSPs and microcontrollers without external glue logic. An ADC (analog-to-digital converter) is a mixed-signal integrated circuit that converts a continuous analog voltage into a discrete digital code. SAR ADCs use a binary-search successive-approximation algorithm with an internal track-and-hold amplifier, achieving an excellent balance of speed, resolution, and power consumption. The AD7893 is fabricated on Analog Devices' LC2MOS process, which combines precision bipolar analog circuits with low-power CMOS logic, sitting within the broader hierarchy: ADC -> data converter -> mixed-signal IC -> semiconductor. Key features of the AD7893BR-10 include 12-bit resolution with no missing codes, an on-chip track-and-hold amplifier, a 117 kSPS throughput rate, and a serial data interface with daisy-chain capability. Typical power consumption is 25 mW during conversion, falling to a low standby current between conversions, making the device well suited to portable, battery-powered, and power-conscious designs. Dynamic performance is specified for harmonic distortion and signal-to-noise ratio in addition to traditional DC accuracy parameters such as integral and differential nonlinearity. Typical applications include industrial process control front ends, data acquisition systems, portable instrumentation, motor control feedback paths, and any DSP-based signal chain that requires a compact, single-supply 12-bit ADC. The wide +/-10 V bipolar input eliminates the need for external signal conditioning in many transducer bridge and process-control front ends. Designers should add 0.1 microfarad decoupling capacitors close to the supply pin and observe the analog/digital ground separation recommended in the datasheet to achieve specified dynamic performance.
AD7893BR-10REEL7 - 12-Bit SAR ADC, 6µs, Serial | Analog Devices
The Analog Devices AD7893BR-10REEL7 is a fast 12-bit successive-approximation analog-to-digital converter (SAR ADC) that operates from a single +5 V supply and delivers a complete conversion in 6 microseconds. Housed in an 8-pin SOIC (mini-SOIC, 0.154 inch / 3.90 mm body width), it integrates the SAR core, an on-chip track-and-hold amplifier, an internal clock, and a high-speed serial interface, enabling compact signal-chain designs where PCB real estate and noise immunity are critical. The device is shipped on a 7-inch tape-and-reel carrier (REEL7) for high-speed automated assembly. What is a SAR ADC? A successive-approximation register ADC is a precision converter class that uses a binary-search algorithm against an internal DAC to digitize an analog input one bit at a time per clock cycle. SAR ADCs occupy the middle ground between flash converters (fastest, lowest resolution) and sigma-delta ADCs (highest resolution, slowest), and they excel in multiplexed data acquisition, instrumentation, and process-control loops where 10-16 bit accuracy at 100 kSPS-1 MSPS suffices. The AD7893 family is one of the legacy Analog Devices LC2MOS precision converters and remains popular for retrofit and refresh designs. Key specifications include 12-bit resolution, sampling rate of approximately 117 kSPS per the datasheet, 6 microsecond typical conversion time, single +5 V supply, and an input range of ±10 V (the -10 speed grade featured on this part). It also offers low power consumption, a hardware shutdown pin (extending battery life in portable applications), and a high-speed serial data output that minimizes board-level digital noise coupling. Designed in Analog Devices' LC2MOS process - a mixed-technology node that combines precision bipolar circuitry with low-power CMOS logic - the AD7893 achieves tight dc accuracy (linearity, full-scale, and offset error) alongside specified dynamic performance including total harmonic distortion and signal-to-noise ratio. The integrated track-and-hold eliminates the need for an external sample-and-hold stage, and the serial interface reduces pin count versus parallel-output ADCs. Typical applications include industrial process-control data acquisition, precision instrumentation input stages, motor control current/voltage sensing, portable and battery-powered measurement equipment, point-of-load monitoring in distributed control systems, and retrofit upgrades for legacy Mini-DIP based designs. When designing with this part, pay attention to the analog input bandwidth and source impedance - the track-and-hold aperture interacts with input RC networks and degrades THD if source impedance is too high. Decouple VDD with a 0.1 µF ceramic capacitor placed within 5 mm of the supply pin and keep the analog/digital ground return paths separated to avoid digital-noise induced linearity drift. This page synthesizes distributor pricing, a drop-in alternatives table including the RoHS-compliant AD7893BRZ-10REEL7, application recommendations, and practical design notes not curated into the manufacturer datasheet.
AD7893BRZ-2REEL7 - 12-Bit SAR ADC, Serial, 8-SOIC | ADI
The Analog Devices AD7893BRZ-2REEL7 is a 12-bit successive-approximation analog-to-digital converter (SAR ADC) with 6 microsecond conversion time and a high-speed two-wire serial interface, specified for the industrial temperature range and supplied on a 7-inch tape-and-reel. Housed in an 8-pin SOIC (SO-8) surface-mount package, the part operates from a single +5 V supply and contains a 6 us SAR ADC core, an on-chip track-and-hold amplifier, an on-chip clock and the serial output port, sampling at 117 kSPS per second. What is a SAR ADC? A successive-approximation register analog-to-digital converter is a precision data-converter architecture that performs one bit at a time using an internal DAC and comparator, trading slightly slower conversion speed for high resolution, low power consumption, deterministic latency, and compact die area. SAR ADCs sit at the bottom of the precision-converter hierarchy - below pipelined and sigma-delta ADCs - and are widely used in industrial process control, data acquisition, instrumentation, motor control, and battery-powered sensor readouts where predictable latency and modest sample rates (10 kSPS to 1 MSPS) are required. Key headline specifications include 12-bit resolution, a true bipolar or unipolar input range (this -2 grade is unipolar 0 V to +5 V / +/-5 V/-10 V option family), 117 kSPS throughput, 6 us conversion time, 5 V single-supply operation, low 25 mW typical power dissipation, and a high-speed serial data port. The on-chip track/hold eliminates the need for an external sample-and-hold, while the integrated oscillator removes the requirement for an external clock source, simplifying board layout and BOM cost. The AD7893 is fabricated in Analog Devices' LC2MOS mixed-signal process, which combines precision bipolar input structures with low-power CMOS logic. The bipolar input stage delivers the dc accuracy and low-noise sampling behavior that characterize ADI's precision ADC portfolio, while the CMOS logic keeps digital power and digital-induced ground bounce manageable. The result is a small-footprint converter that competes favorably against discrete ADC + op-amp + reference + clock designs in cost-sensitive applications. Typical applications include industrial process control loops, multi-channel data-acquisition front-ends, motor-speed and position feedback, battery management monitoring, portable instrumentation, and point-of-load monitoring inside power-conversion systems. Designers benefit from the part's small 8-pin package when PCB real estate is at a premium. When designing with this device, follow a standard SAR decoupling scheme with a 0.1 uF ceramic bypass capacitor at the VDD pin and an optional 10 uF bulk capacitor on the analog supply rail to suppress digital switching transients. Keep the analog input traces short and guarded because the input bandwidth of the on-chip track/hold is limited. Drive the SCLK and CONVST signals with clean digital logic to avoid corrupting the conversion result. This page synthesizes distributor pricing, drop-in same-package alternatives, and practical decoupling/layout notes that go beyond what is found in the Analog Devices AD7893 datasheet alone.
AD7894AR-10REEL7 - 14-Bit 200kSPS Serial ADC | Analog Devices
The Analog Devices AD7894AR-10REEL7 is a 14-bit, 5 µs successive-approximation analog-to-digital converter (SAR ADC) that operates from a single +5 V supply and is housed in an 8-pin SOIC package. It delivers up to 200 kSPS sampling rate, accepts a bipolar ±10 V input range (on the -10 variant), and integrates an on-chip track-and-hold amplifier, an on-chip clock, and a high-speed 2-wire serial interface. The -REEL7 suffix designates a 7-inch tape-and-reel packaging variant for high-volume surface-mount assembly. What is a SAR ADC? A successive-approximation-register analog-to-digital converter is a class of ADC that converts an analog input to a digital code by performing a binary search across an internal DAC and comparator. SAR ADCs occupy a middle ground between flash converters (fastest, lowest resolution) and sigma-delta ADCs (slowest, highest resolution), typically delivering 8-18 bits at 100 kSPS to several MSPS with no pipeline latency. SAR ADCs are the workhorse of industrial data acquisition, motor control, and instrumentation signal chains because each conversion is a single-shot event with deterministic timing. Key features of the AD7894 include ±5 LSB maximum integral nonlinearity, guaranteed ac specifications such as 78 dB SINAD and -85 dB total harmonic distortion at the input tone, hardware configurable for ±5 V or 0-5 V unipolar inputs across the AD7894 family, and a hardware CONVST pin for precise sampling control. The 8-lead SOIC footprint enables compact PCB placement next to analog front ends. Power consumption is approximately 20 mW typical at full sampling rate, allowing the converter to operate in thermally constrained enclosures. The AD7894 uses a capacitive-charge-redistribution DAC core with auto-calibrated switch-capacitor front-end, providing excellent dc accuracy and low aperture uncertainty. The on-chip track-and-hold amplifier settles to 14-bit accuracy within 200 ns, supporting high-bandwidth multiplexed input architectures. The serial interface is hardware- or DSP-compatible, reducing opto-isolation cost in noisy industrial environments. Typical applications include industrial process control, motor control position feedback, portable instrumentation, data acquisition systems, and DSP front-ends. The wide bipolar input range makes the AD7894-10 particularly suited for direct connection to current-sense amplifiers and bridge transducers without additional signal conditioning. When designing with this ADC, place the 0.1 µF decoupling capacitor within 5 mm of the VDD pin and keep analog and digital grounds separated until they connect at the ADC's AGND pin. Avoid routing the CONVST and SCLK traces parallel to noisy switching signals to preserve 14-bit SNR. This page synthesizes verified distributor stock, drop-in cross-references from Analog Devices' own AD7894 family and competitor ADCs, and practical PCB design notes that go beyond the manufacturer datasheet.
AD7894BRZ-10REEL - 14-Bit 200kSPS 5V Serial ADC | Analog Devices
Analog Devices AD7894BRZ-10REEL is a 14-bit, 200 kSPS successive-approximation analog-to-digital converter (SAR ADC) housed in an 8-pin SOIC (SOIC-8) package, specified over a -10 V to +10 V bipolar analog input range and operating from a single +5 V supply. A successive-approximation ADC is a precision data converter type that uses an internal binary-search register to compare the sampled input against a precisely scaled DAC reference voltage, achieving one conversion step per clock cycle on the DAC side. This topology sits one level above flash converters in speed and one level below sigma-delta converters in resolution, occupying the middle ground where 12-16-bit accuracy at tens-to-hundreds of kSPS is required. The AD7894 is a classic member of this category, well-suited to industrial process control, instrumentation, and motor-control feedback loops. Key specifications distinguishing the AD7894BRZ-10 include a 4.5 microsecond conversion time (approximately 200 kSPS throughput), an on-chip track-and-hold amplifier, an on-chip clock, and a high-speed serial interface that reduces external pin count. The bipolar -10 V to +10 V input range eliminates external signal conditioning for many industrial signals. Single-supply +5 V operation simplifies board-level power tree design, and the ADC draws its bias from the same rail that powers the host microcontroller or DSP. Architecturally, the AD7894 integrates the input multiplexer-free front end, charge-redistribution DAC array, comparator, and SAR logic onto a single BiCMOS die. Dynamic performance parameters include harmonic distortion and signal-to-noise ratio specified for the audio and precision-DC measurement bands. Standalone through-pin serial control (RFS, SCLK, SDATA) means the part can be driven from the SPI or DSP-serial port of most microcontrollers without external logic. Typical applications include industrial process control (4-20 mA loop digitization), motor control current/voltage feedback, instrumentation sensors, and data-acquisition front-ends where a bipolar input range and serial interface reduce opto-isolation cost. The wide input common-mode range also simplifies protection circuitry in line-powered installations. When designing with this ADC, allocate the host microcontroller a DMA or interrupt-driven SPI handler because a 200 kSPS throughput demands bus availability roughly every 5 microseconds. Use a low-impedance input buffer (such as the AD8021) if the source impedance exceeds 1 kohm and decouple the +5 V supply with both a 10 microfarad tantalum and a 0.1 microfarate ceramic placed within 5 millimeters of the pin. This page synthesizes distributor pricing, drop-in alternatives in the same SOIC-8 footprint, and practical design notes not found in the manufacturer datasheet alone, helping engineers source and qualify the AD7894BRZ-10REEL quickly for production designs.
AD7898AR-3REEL - 12-Bit 220 kSPS Serial ADC SOIC-8 | Analog Devices
The Analog Devices AD7898AR-3REEL is a 12-bit successive-approximation analog-to-digital converter (SAR ADC) with 220 kSPS throughput, single 5 V supply operation, and a high-speed flexible serial interface in an 8-pin SOIC package. It accepts ±10 V or 0 to 5 V input ranges depending on the speed-grade suffix, where the -3 variant supports 0 to 5 V (unipolar) or ±2.5 V (bipolar) input spans through external RFB/RIN scaling, while integrating a successive-approximation core, on-chip track/hold, on-chip clock, and 3-wire/2-wire serial logic. A SAR ADC (Successive Approximation Register Analog-to-Digital Converter) is a class of data converter that uses an internal binary-search algorithm to resolve each analog sample in N clock cycles (where N is the bit count), making it the dominant topology for medium-speed, medium-resolution precision acquisition in industrial, instrumentation, and process-control designs. SAR ADCs sit in the broader hierarchy of ADC -> data converter -> signal chain IC -> mixed-signal semiconductor, and are typically chosen when both latency and deterministic throughput matter more than raw speed alone. Key specifications include 12-bit resolution, 220 kSPS sampling rate, 5 V single-supply operation, an on-chip 4.5 µs conversion time, and a serial data interface that supports both self-clocked (3-wire) and external-clock (2-wire) modes. The AD7898 also offers dynamic-performance specifications including harmonic distortion (SFDR) and signal-to-noise ratio (SNR) beyond traditional DC linearity, which lets designers predict AC behavior in DSP and motor-control systems. Typical applications include industrial process control, data acquisition systems, battery-powered instrumentation, motor control feedback loops, and portable instrumentation where the 5 V single-supply, low power, and small 8-lead SOIC footprint simplify board layout. The wide input-voltage compliance and on-chip clock also make it well-suited for transducer-bridge digitizers, isolated current-loop readouts, and point-of-load monitor inputs in factory automation. When designing with the AD7898, follow the input-scaling resistor network shown in the datasheet and use a 0.1 µF decoupling capacitor on VDD placed within 50 mm of the supply pin. A high-speed serial clock (SCLK) above 10 MHz requires controlled-impedance routing because the 3-wire interface can couple adjacent traces at full sample rate.