ADC/DAC
Products (2398)
AD7683BCPZRL - 16-Bit 100kSPS PulSAR ADC | Analog Devices
The Analog Devices AD7683BCPZRL is a 16-bit, 100 kSPS successive-approximation PulSAR analog-to-digital converter housed in an 8-lead LFCSP-WD (3x3 mm) package with an exposed thermal pad. According to the Analog Devices datasheet, the device operates from a single 2.7 V to 5.5 V supply and uses a charge-redistribution SAR architecture to deliver 16-bit resolution with no missing codes (B grade), typical INL of ±1 LSB, and a maximum INL of ·3 LSB across the full temperature range. A successive-approximation register (SAR) ADC is a precision data-converter type that compares the sampled input against an internal binary-weighted capacitor DAC one bit per conversion cycle. PulSAR is Analog Devices' proprietary name for its family of low-power, high-speed, charge-redistribution SAR ADCs. SAR ADCs sit within the broader data-converter family alongside delta-sigma ADCs and pipeline ADCs; they are favored where low-latency single-shot conversions, deterministic throughput, and excellent DC linearity are required. The AD7683BCPZRL integrates a low-noise, wide-bandwidth track-and-hold with short aperture delay, an internal conversion clock, and a serial SPI-compatible digital interface. A pseudo-differential analog input accepts a 0 V to VREF unipolar range, with VREF allowed up to VDD. The compact LFCSP-8 (3x3) footprint and SPI interface make the part a strong fit for channel-dense PCBAs that must keep board area, BOM count, and firmware complexity to a minimum. The device consumes only a few milliwatts at full throughput, enabling continuous 100 kSPS conversion without thermal concerns and supporting battery-powered portable instruments. Its pseudo-differential input and high-impedance sampling front end make the part resilient to source-impedance variation, simplifying analog front-end design for transducer, sensor, and process-control signal chains. Typical uses include industrial process control loop sensing, multichannel data-acquisition modules, portable medical instruments, weigh-scale and strain-gauge digitizers, and precision sensor readout. The +2.7 V to +5.5 V supply range maps directly onto common 3.3 V and 5 V rails, and the SPI port simplifies isolation in high-noise industrial systems. When designing with this ADC, observe the layout guidance in the Analog Devices datasheet: keep the analog signals on one side of the package and the digital signals on the other, use a solid ground plane beneath the part, and route digital traces away from the analog inputs to minimize digital-noise coupling into the sampled signal. This page synthesizes distributor pricing benchmarks, B-grade SAR pin-compatible alternatives, and practical PCB-layout guidance from the Analog Devices datasheet in one consolidated reference - information typically scattered across the manufacturer datasheet, distributor listings, and individual application notes.
AD7684BCPZ - 16-Bit 100kSPS PulSAR ADC | Analog Devices
The AD7684BCPZ is a 16-bit, charge redistribution, successive approximation, PulSAR analog-to-digital converter (ADC) from Analog Devices. It operates from a single power supply, VDD, between 2.7 V and 5.5 V, and features a low power, high speed, 16-bit sampling ADC with no missing codes, an internal conversion clock, and a serial SPI-compatible interface. The device is available in a 20-lead LFCSP (4x4 mm) package, offering a compact solution for precision data acquisition systems. What is a successive approximation register (SAR) ADC? A SAR ADC is a type of analog-to-digital converter that uses a binary search algorithm to convert an analog input into a digital output. It typically consists of a comparator, a digital-to-analog converter (DAC), and a successive approximation register. SAR ADCs are known for their high speed, low power consumption, and excellent accuracy, making them ideal for applications such as industrial process control, medical instrumentation, and portable battery-powered devices. They are a subset of the broader ADC family, which also includes delta-sigma and pipeline converters, and are widely used in data acquisition systems. Key features of the AD7684BCPZ include a 16-bit resolution with no missing codes, a throughput of 100 kSPS, and a differential input. The device also features a low noise performance, with a typical SNR of 92 dB and a typical THD of -110 dB. It includes an internal conversion clock and a serial interface that is SPI-compatible, simplifying integration with microcontrollers and DSPs. The power consumption is typically 4.5 mW at 5 V and 2.5 mW at 2.7 V, making it suitable for power-sensitive applications. The AD7684BCPZ uses a charge redistribution architecture, which provides inherent sample-and-hold functionality and excellent linearity. The device includes a low noise, wide bandwidth track-and-hold amplifier that can handle input frequencies up to 45 kHz. The reference input is buffered, allowing the use of low-cost external references. The device also features a power-down mode that reduces current consumption to 1 uA, ideal for battery-powered systems. Typical applications for the AD7684BCPZ include battery-powered instrumentation, portable medical devices, data acquisition systems, and industrial process control. Its high accuracy and low power make it an excellent choice for applications where precision and energy efficiency are critical. When designing with the AD7684BCPZ, ensure that the reference voltage is stable and well-decoupled, as it directly affects the conversion accuracy. The analog input should be driven by a low-impedance source, and proper layout techniques should be used to minimize noise and parasitic capacitance.
AD7685ARMZRL7 - 16-Bit 250 kSPS PulSAR ADC | Analog Devices
The Analog Devices AD7685ARMZRL7 is a 16-bit, 250 kSPS PulSAR successive approximation register (SAR) analog-to-digital converter with no missing codes, housed in a 10-lead MSOP (RM-10) package supplied on tape and reel. It operates from a single supply VDD of 2.3 V to 5.5 V and communicates over a SPI/MICROWIRE/QSPI/DSP-compatible serial interface. A SAR ADC is a type of analog-to-digital converter that successively approximates the input voltage using a binary search algorithm with a capacitive DAC. Within the signal-chain hierarchy, the AD7685 sits between the analog front end (amplifiers, filters, sensors) and the digital controller, converting real-world signals into 16-bit digital words for processing. PulSAR is Analog Devices' proprietary SAR architecture optimized for low power and high accuracy. Key features include 16-bit resolution with no missing codes, 250 kSPS maximum throughput, INL of +/-0.6 LSB typical and +/-2 LSB maximum, and a separate VIO logic supply compatible with 1.8 V, 2.5 V, 3 V, or 5 V logic. The pseudo-differential input with wide common-mode range, together with the low-noise analog input lowpass filter formed by RIN and CIN, allows a noisier driver amplifier to still meet a given system noise specification. Technical depth: the AD7685 uses a charge-redistribution SAR core with an internal conversion clock, so no external clock is required for conversion. Its noise performance is lower than most other 16-bit ADCs per the Analog Devices datasheet, contributing to higher effective resolution in practical systems. Operation is specified from -40 C to +85 C. Typical applications include battery-powered portable instrumentation, industrial process control data acquisition, and medical monitoring equipment, where the 250 kSPS rate and low power consumption fit multi-channel scanning systems. Design consideration: the separate VIO pin lets you drop logic level to 1.8 V for modern microcontrollers, but keep the REF pin decoupled with low-ESR ceramics to preserve linearity. This page synthesizes distributor pricing, drop-in alternatives, pinout detail, and practical design notes not found in the manufacturer datasheet alone.
AD7685BCPZ - 16-Bit 250kSPS PulSAR ADC | Analog Devices
The AD7685BCPZ is a 16-bit, charge redistribution successive approximation register (SAR) analog-to-digital converter (ADC) from Analog Devices, operating from a single 2.3 V to 5.5 V power supply. It achieves a throughput of 250 kSPS with no missing codes, making it ideal for high-precision data acquisition systems. The device is available in a compact 10-lead LFCSP-WD (3x3 mm) package, suitable for space-constrained designs. A SAR ADC is a type of analog-to-digital converter that uses a binary search algorithm to convert an analog input into a digital output. It employs a charge redistribution capacitor array to perform the conversion, offering a balance of speed, resolution, and power consumption. SAR ADCs are widely used in applications requiring high accuracy and moderate sampling rates, such as industrial process control, medical instrumentation, and portable battery-powered devices. Key features of the AD7685BCPZ include 16-bit resolution with no missing codes, a 250 kSPS sampling rate, and a low power consumption of typically 3.5 mW at 5 V supply. The device also features a pseudo-differential input, an SPI-compatible serial interface, and a power-down mode for energy savings. The LFCSP package provides excellent thermal performance and a small footprint, enabling high-density PCB layouts. The AD7685 uses a charge redistribution architecture with an internal track-and-hold circuit, ensuring accurate sampling of the input signal. The device includes a precision reference input that can be driven by an external reference, allowing flexibility in system design. The SPI interface supports daisy-chaining of multiple ADCs, simplifying multi-channel data acquisition systems. Typical applications include battery-powered instrumentation, data acquisition systems, industrial process control, and medical devices. The AD7685's low power and high accuracy make it suitable for portable and remote sensing applications where power efficiency is critical. When designing with the AD7685BCPZ, ensure a clean analog supply and a stable reference voltage to achieve optimal performance. Proper PCB layout with adequate decoupling and grounding is essential to minimize noise and maximize SNR.
AD7685CCPZ-R2 - 16-Bit 250 kSPS SAR ADC | Analog Devices | LFCSP-10
The Analog Devices AD7685CCPZ-R2 is a 16-bit, 250 kSPS successive-approximation-register (SAR) analog-to-digital converter that operates from a single 2.3 V to 5.5 V supply, housed in a 10-pin LFCSP-WD (3x3) package with exposed die pad. According to the Analog Devices AD7685 datasheet, it integrates a low-power, high-speed 16-bit sampling ADC with no missing codes, an internal conversion clock, and a versatile digital interface. A SAR ADC (Successive Approximation Register Analog-to-Digital Converter) is a precision data converter architecture that resolves one bit per clock cycle by switching a charge-redistribution capacitor DAC against the input signal. The SAR architecture is the de-facto choice for applications requiring low latency, deterministic acquisition, and excellent DC accuracy at moderate sampling rates; it sits hierarchically under ADC -> data converter -> signal chain IC -> semiconductor. Compared to delta-sigma converters, SAR ADCs deliver faster settling with no digital decimation delay. Key features of the AD7685 include 16-bit resolution with no missing codes, true differential analog input, SPI/QSPI/MICROWIRE/DSP-compatible serial interface, and a low 4 mW typical power dissipation at 250 kSPS with 5 V supply. The internal oscillator and reference buffer remove the need for external clock or buffer components, enabling compact BOM-precision or data acquisition front ends. The wide 2.3 V-5.5 V supply range supports both 3.3 V and 5 V system rails. Architecturally, the AD7685 uses a charge-redistribution switched-capacitor DAC core with inherent sample-and-hold, followed by a precision successive-approximation register and digital error correction. The LFCSP-WD-10 (3x3) package provides a thermal pad that must be soldered to the PCB ground plane to achieve the rated AC and DC performance, since the die pad is the primary thermal and electrical return. Typical applications include industrial process control (4-20 mA loop digitization), portable instrumentation and battery-powered data loggers, precision sensor signal conditioning, and medical monitoring front ends. When designing with the AD7685, ensure the exposed pad is soldered to a grounded copper pour of at least 10 mm^2; missing this connection degrades linearity. Use short, symmetric analog input traces and place the reference decoupling capacitor within 5 mm of the REF pin to preserve 16-bit performance. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, giving engineers a single-source reference for selecting the AD7685CCPZ-R2 in precision data-acquisition designs.
AD7686BCPZ - 16-Bit 500kSPS PulSAR ADC | Analog Devices
The AD7686BCPZ is a 16-bit, 500 kSPS successive approximation (SAR) analog-to-digital converter (ADC) from Analog Devices, featuring a PulSAR architecture. It operates from a single 2.3V to 5.5V power supply and is available in a 10-lead LFCSP-WD (3x3 mm) package. The device offers a high-speed serial interface (SPI) and a pseudo-differential analog input, making it suitable for a wide range of precision data acquisition applications. An ADC (analog-to-digital converter) is an electronic component that converts continuous analog signals into discrete digital values. The AD7686 is a SAR ADC, which uses a binary search algorithm to determine the digital output, offering a good balance of speed, resolution, and power consumption. SAR ADCs are widely used in industrial, medical, and instrumentation systems where high accuracy and moderate sampling rates are required. Key features of the AD7686BCPZ include a maximum sampling rate of 500 kSPS, 16-bit resolution with no missing codes, and a typical signal-to-noise ratio (SNR) of 92 dB. The device also features a low power dissipation of 12.5 mW at 500 kSPS, which scales with throughput, making it ideal for battery-powered applications. The pseudo-differential input allows for flexible signal conditioning, and the SPI-compatible serial interface simplifies connection to microcontrollers and DSPs. The AD7686 uses a charge redistribution (capacitive DAC) architecture with an internal reference buffer, achieving excellent linearity and low noise. The device includes a 1-pole low-pass filter on the analog input, which helps to reduce external noise. The LFCSP package provides a compact footprint and good thermal performance, enabling dense PCB layouts. Typical applications include portable instrumentation, medical devices, data acquisition systems, and industrial process control. The high SNR and low power make it suitable for battery-operated equipment where power efficiency is critical. The device is also used in vibration analysis, motor control, and other precision measurement systems. When designing with the AD7686BCPZ, ensure that the reference voltage is stable and well-decoupled. The analog input should be driven by a low-impedance source to maintain accuracy. The serial interface timing must be respected to avoid data corruption. Proper PCB layout, including a solid ground plane and short traces, is essential for achieving the specified performance.
AD7686BCPZ-R2 - 16-Bit 500 kSPS SAR ADC | Analog Devices
The Analog Devices AD7686BCPZ-R2 is a 16-bit, single-channel, 500 kSPS successive approximation register (SAR) analog-to-digital converter (ADC) housed in a 10-pin LFCSP-WD (3x3) package with an exposed pad. It operates from a single 5 V supply (VDD) and a logic interface supply (VIO) from 2.3 V to 5.5 V, integrating a low-power, high-speed sampling ADC with no missing codes, an internal conversion clock, and a versatile serial SPI-/QSPI-/MICROWIRE-/DSP-compatible digital interface. The part's typical power dissipation is around 10 mW at 500 kSPS and drops to less than 1 µW in full power-down, supporting portable and thermally constrained applications. A successive-approximation ADC (SAR ADC) is a sampled-data converter that performs one bit-trial per clock cycle using a charge-redistribution digital-to-analog converter (DAC) and a comparator. In the broader signal-chain taxonomy, the AD7686 sits in the precision-medium-speed tier between general-purpose SAR ADCs (<100 kSPS, 12-14 bit) and high-speed pipeline ADCs (>1 MSPS, 14-16 bit). It is widely used as a precision front end where 16-bit resolution at moderate sampling rates is required, including instrumentation, process control, and data acquisition front ends. Key features of the AD7686BCPZ-R2 include 16-bit resolution (no missing codes), 500 kSPS throughput, a single-ended analog input range of 0 V to VREF (or 0 V to 2xVREF in bipolar mode), an internal 2.5 V or external reference option, true differential analog inputs, single-supply 5 V operation with 2.3 V-5.5 V logic compatibility, low power consumption of approximately 10 mW at full speed, and SPI/QSPI/MICROWIRE/DSP-compatible serial interface with chain-mode daisy chaining. The on-chip temperature sensor and integrated input protection further simplify board design. The architecture combines a charge-redistribution capacitive DAC with a high-speed comparator and successive-approximation register, achieving 16-bit performance with no pipeline latency. This makes the part ideal for multiplexed applications and DC measurements where latency must be deterministic. The -R2 reel designation refers to the small-quantity reel package, and the BC speed grade designates 500 kSBS throughput. Typical applications include industrial process control and PLC analog input modules, precision data acquisition systems, medical instrumentation front ends, battery-powered portable measurement devices, optical sensor monitoring, and multichannel data-acquisition systems with channel-to-channel isolation. The wide input common-mode range and robust ESD rating make it well-suited for harsh industrial environments. A key design consideration is the choice between the internal 2.5 V reference and an external low-noise reference. While the internal reference saves board area, an external ADR445 or ADR01 reference improves SNR by up to 3 dB in demanding instrumentation applications. Decoupling of the VDD and VIO rails with 10 µF tantalum and 0.1 µF ceramic capacitors placed within 5 mm of the supply pins is recommended in the datasheet typical-application circuit. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
AD7687BCPZ - 16-Bit 250kSPS PulSAR ADC | Analog Devices
The AD7687BCPZ is a 16-bit, 250 kSPS successive approximation (SAR) analog-to-digital converter (ADC) from Analog Devices, part of the PulSAR family. It features a differential input and operates from a single 2.3 V to 5.5 V supply, with a separate VIO pin for digital interface compatibility with 1.8 V, 2.5 V, 3 V, or 5 V logic. The device is housed in a compact 10-lead LFCSP-WD (3x3 mm) package, making it suitable for space-constrained applications. An ADC (analog-to-digital converter) is an electronic component that converts continuous analog signals into discrete digital numbers. The AD7687 is a SAR ADC, which uses a successive approximation register algorithm to perform conversions with high speed and accuracy. SAR ADCs are widely used in data acquisition systems, industrial process control, and medical instrumentation due to their excellent balance of speed, resolution, and power consumption. The AD7687 belongs to the PulSAR family, known for its low power and high precision. Key features of the AD7687BCPZ include 16-bit resolution with 1.5 LSB INL (integral nonlinearity), a maximum sampling rate of 250 kSPS, and a differential input range of ±VREF. The device offers a serial SPI-compatible interface with daisy-chain capability and an optional BUSY indicator via the SDI pin. Power consumption scales linearly with throughput, enabling low-power operation in battery-powered systems. The ADC also features a pseudo-differential input option and a dedicated VIO pin for flexible logic-level interfacing. Technically, the AD7687 uses a charge-redistribution capacitive DAC architecture, which provides inherent sample-and-hold functionality and excellent linearity. The device includes an internal reference buffer, but an external reference voltage (VREF) is required, typically ranging from 0.5 V to VDD. The ADC achieves a signal-to-noise ratio (SNR) of 92 dB and a total harmonic distortion (THD) of -108 dB, making it suitable for high-precision measurement applications. The LFCSP package offers a small footprint with an exposed pad for improved thermal performance. Typical applications include portable instrumentation, battery-powered data loggers, medical devices such as patient monitors, and industrial process control. The AD7687's low power consumption (typically 4.5 mW at 250 kSPS) and small package make it ideal for these applications. The SPI interface simplifies connection to microcontrollers and DSPs, and the daisy-chain feature allows multiple ADCs to share a single bus. When designing with the AD7687, ensure that the reference voltage is stable and well-decoupled, as it directly affects conversion accuracy. The VIO pin must be connected to the appropriate logic supply to match the host interface voltage. Proper PCB layout with separate analog and digital ground planes is recommended to minimize noise and achieve optimal performance.
AD7687BCPZ-R2 - 16-Bit 250kSPS PulSAR Differential ADC | Analog Devices
The Analog Devices AD7687BCPZ-R2 is a 16-bit, 1.5 LSB INL, 250 kSPS PulSAR differential analog-to-digital converter (ADC) housed in a 10-pin LFCSP-WD (3x3) package with an exposed pad. It operates from a single 2.3 V to 5.5 V VDD supply, integrates a low-power high-speed 16-bit sampling ADC with no missing codes, and supports a separate VIO logic supply for 1.8 V, 2.5 V, 3.3 V, or 5 V digital interface compatibility. Throughput scales linearly with sample rate, allowing users to trade speed for power. A successive-approximation register (SAR) ADC, also known as a PulSAR, performs conversion through charge redistribution on a capacitive DAC. This architecture delivers deterministic latency (no pipeline delay), inherent sample-and-hold behavior, and excellent DC accuracy, making SAR ADCs the preferred topology for precision multiplexed data acquisition, industrial instrumentation, and motor control feedback. Within the broader taxonomy, SAR ADCs sit under data converters -> ADCs -> precision ADCs. Key features include a true differential analog input, ±VREF common-mode range, 1.5 LSB maximum INL, no missing codes at 16 bits, low power consumption proportional to throughput, an SPI-compatible serial interface with optional BUSY indicator via SDI, and daisy-chain capability for multi-ADC 3-wire buses. The integrated reference input and compact LFCSP-10 footprint simplify board layout while keeping noise immunity high through the exposed thermal pad tied to ground. The internal conversion is governed by a precision DAC and comparator clocked by an internal oscillator; a single CNV rising edge initiates acquisition and conversion, and the BUSY line signals completion. Power dissipation scales linearly with throughput, so at 250 kSPS the part consumes its maximum rated current while at reduced sample rates power drops proportionally - a useful trait for battery-instrumented designs. Typical applications include industrial process control and PLC analog input modules, medical instrumentation signal acquisition, battery-powered portable sensors, multi-channel data acquisition systems (DAQ), motor and motion control feedback loops, and precision weigh scales. The differential input and excellent DC accuracy make it especially suited to bridge and thermocouple front ends. When designing with the AD7687BCPZ-R2, treat the exposed pad as the primary thermal and ground path - solder it to a sufficiently large ground plane. Use a low-noise reference (such as the ADR45xx family) and keep analog/digital ground returns separated until they join under the IC's exposed pad to preserve CMRR. This page consolidates distributor pricing, drop-in alternatives, and applied design notes that go beyond the manufacturer datasheet's content to accelerate your precision-ADC design.
AD7687BCPZRL - 16-Bit 250kSPS Differential SAR ADC | Analog Devices
The Analog Devices AD7687BCPZRL is a 16-bit, 250 kSPS, differential-input, successive-approximation-register (SAR) analog-to-digital converter (ADC) housed in a 10-pin LFCSP-WD (3 mm x 3 mm) package with an exposed pad for thermal dissipation. A SAR ADC is a precision data converter that performs a binary search against the analog input using an internal capacitive DAC and comparator, returning fully-settled conversion results in a deterministic number of clock cycles. Within the broader converter hierarchy, the AD7687 belongs to the successive-approximation family, which sits between flash converters (fastest, lowest resolution) and sigma-delta converters (highest resolution, lowest bandwidth). SAR ADCs are widely favored in multiplexed data-acquisition systems, control loops, and precision instrumentation because of their deterministic latency, low latency to first valid sample, and lack of pipeline delay. Key specifications for the AD7687BCPZRL include 16-bit resolution with no missing codes, 250 kSPS throughput, INL of +/-0.4 LSB typical and +/-1.5 LSB maximum, dynamic range of 96.5 dB, and signal-to-noise-plus-distortion (SINAD) measured at 20 kHz. The device accepts a true differential analog input and operates from a single 2.5 V to 5.5 V analog supply, with a separate VIO logic supply that allows 1.8 V, 2.5 V, 3.3 V, or 5 V digital interfacing without level shifters. The SPI-compatible serial interface supports 3-wire and 4-wire modes, optional BUSY indication through the SDI pin, and daisy-chaining of multiple converters on a single 3-wire bus. Typical applications include industrial process control and PLC analog input modules, multichannel data-acquisition systems, medical instrumentation front-ends, and precision sensor signal chains. The combination of high dynamic range, low noise, and small 3 mm x 3 mm footprint also makes it well suited for portable battery-powered measurement equipment where PCB real estate is constrained. When designing with the AD7687BCPZRL, place the decoupling capacitors as close as possible to the analog and digital supply pins, route the analog and digital grounds as separate planes joined at a single point beneath the exposed pad, and ensure that the REF pin is driven by a low-noise, low-drift reference such as the ADR45xx family to avoid degrading the converter's noise performance. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes that supplement the manufacturer datasheet and accelerate your evaluation of the AD7687BCPZRL for precision analog front-end designs.
AD7688BCPZ - 16-Bit 500kSPS PulSAR ADC | Analog Devices
The AD7688BCPZ is a 16-bit, 500 kSPS successive approximation (SAR) analog-to-digital converter (ADC) from Analog Devices, featuring a true differential input and a tiny 10-lead LFCSP-WD (3x3 mm) package. It operates from a single 2.3 V to 5.5 V supply and provides excellent DC and AC performance, including ±0.4 LSB typical INL, 96.5 dB dynamic range, and 95.5 dB SNR at 20 kHz. The device uses the PulSAR architecture, which combines a capacitive DAC with a high-speed comparator to achieve fast, accurate conversions with low power consumption. A SAR ADC is a type of analog-to-digital converter that uses a binary search algorithm to determine the digital output. It compares the input signal against a reference voltage using a successive approximation register, converging to the final value in N steps for an N-bit converter. SAR ADCs are widely used in data acquisition systems, industrial process control, medical instrumentation, and portable devices due to their high resolution, low latency, and low power consumption. The AD7688 belongs to the PulSAR family, known for its high precision and ease of use. Key features of the AD7688BCPZ include 16-bit resolution with no missing codes, a throughput of 500 kSPS, and a true differential analog input range that can be configured for unipolar or bipolar operation. The device offers a serial interface (SPI) that operates at clock speeds up to 50 MHz, allowing for high-speed data transfer. It also includes a busy indicator and a conversion result readback feature, simplifying system integration. The LFCSP package is lead-free and RoHS compliant, making it suitable for environmentally conscious designs. Technically, the AD7688 uses a charge redistribution architecture with an internal reference buffer, eliminating the need for an external reference driver in many applications. The device provides excellent linearity with a maximum INL of ±1.5 LSB (±23 ppm of FSR) and a THD of -118 dB at 20 kHz, ensuring high-fidelity signal acquisition. The input range is fully differential, allowing the ADC to reject common-mode noise and improve dynamic performance. The device operates over the industrial temperature range of -40°C to +85°C, making it suitable for harsh environments. Typical applications include high-speed data acquisition systems, medical imaging equipment, industrial process control, and portable instrumentation. The AD7688's combination of high speed, high resolution, and low power makes it ideal for battery-powered devices where performance and efficiency are critical. Its small package footprint also enables compact PCB designs. When designing with the AD7688BCPZ, ensure that the reference voltage is stable and well-decoupled, as it directly affects conversion accuracy. Use a low-noise reference such as the ADR4550 and place decoupling capacitors close to the VDD and VIO pins. The differential input should be driven with a low-impedance source to maintain linearity.
AD7690BCPZRL7 - 18-Bit 400kSPS PulSAR ADC | Analog Devices
The AD7690BCPZRL7 is an 18-bit, successive approximation register (SAR) analog-to-digital converter (ADC) from Analog Devices, offering a 400 kSPS throughput in a compact 10-lead LFCSP-WD (3x3 mm) package. It operates from a single 5V supply (VDD) and features a differential input, an internal conversion clock, and a versatile SPI-compatible serial interface. The device guarantees no missing codes over the full operating temperature range, making it suitable for precision measurement applications. An ADC (analog-to-digital converter) is an electronic component that converts a continuous analog voltage into a discrete digital representation. SAR ADCs use a binary search algorithm to approximate the input voltage, balancing speed and resolution. The AD7690 belongs to the PulSAR family, known for low power consumption and high accuracy, and is part of the broader class of data converters used in signal processing chains. Key features include 18-bit resolution with no missing codes, integral nonlinearity (INL) of ±0.75 LSB typical and ±1.5 LSB maximum (±6 ppm of FSR), and a dynamic range that scales with throughput. The device supports daisy-chaining via the SDI input, allowing multiple ADCs on a single 3-wire bus, and includes an optional busy indicator. It is compatible with 1.8V, 2.5V, 3V, or 5V logic through a separate VIO supply. The AD7690 uses a low-power, high-speed 18-bit sampling ADC architecture with an internal conversion clock, eliminating the need for external clocking. The power consumption scales linearly with throughput, enabling efficient operation in battery-powered systems. The differential input provides excellent common-mode rejection, and the device is specified from 4.75V to 5.25V. Typical applications include precision data acquisition systems, medical instrumentation, industrial process control, and vibration analysis. The high resolution and low noise make it ideal for sensor interfaces where accuracy is critical. The small LFCSP package saves board space, and the SPI interface simplifies connection to microcontrollers and DSPs. When designing with the AD7690, ensure a clean, low-noise analog supply and proper decoupling. The reference input should be driven by a low-impedance source, and the layout should minimize parasitic capacitance on the analog inputs to maintain specified performance.
AD7690BRMZ - 18-Bit 400kSPS PulSAR ADC | Analog Devices
The AD7690BRMZ is an 18-bit, successive approximation register (SAR) analog-to-digital converter (ADC) from Analog Devices, offering a 400 kSPS throughput in a compact 10-lead MSOP package. It operates from a single 5V supply (VDD) and features a differential input with a maximum integral nonlinearity (INL) of 1.5 LSB, ensuring high accuracy for precision measurement applications. The device includes an internal conversion clock and a versatile SPI-compatible serial interface that supports daisy-chaining multiple ADCs on a single 3-wire bus, with an optional busy indicator. It is compatible with 1.8V, 2.5V, 3V, or 5V logic via a separate VIO supply, making it flexible for various digital host interfaces. An ADC (analog-to-digital converter) is a device that converts continuous analog signals into discrete digital numbers, enabling digital processing of real-world signals. SAR ADCs use a binary search algorithm to approximate the input voltage, offering a good balance of speed, resolution, and power consumption. The AD7690 belongs to the PulSAR family, known for low power and high precision, and is widely used in data acquisition systems, industrial process control, and medical instrumentation. Key features of the AD7690BRMZ include 18-bit resolution with no missing codes, a 400 kSPS sampling rate, and a power dissipation that scales linearly with throughput. The differential input range is ±VREF, with VREF ranging from 2.3V to 5.25V, allowing flexible reference configurations. The device also offers a pseudo-differential mode for single-ended applications. The SPI interface supports daisy-chaining, reducing the number of digital lines required in multi-channel systems. Technically, the AD7690 uses a charge redistribution architecture with a capacitive DAC, achieving excellent linearity and low noise. The internal conversion clock eliminates the need for an external clock, simplifying design. The device operates over a temperature range of -40°C to +125°C, making it suitable for industrial environments. The MSOP-10 package is small, saving board space, and is available in tape and reel for automated assembly. Typical applications include high-speed data acquisition, industrial process control, medical imaging, and battery-powered instrumentation. The high resolution and speed make it ideal for precision measurement systems where accuracy is critical. The low power consumption, which scales with throughput, is beneficial for portable devices. When designing with the AD7690BRMZ, ensure a clean, low-impedance reference voltage and adequate decoupling on VDD and VIO. The differential input should be driven with a low-impedance source to maintain accuracy. For best performance, use a precision reference and careful PCB layout to minimize noise.
AD7690BRMZ-RL7 - 18-Bit 400kSPS PulSAR ADC | Analog Devices
The AD7690BRMZ-RL7 is an 18-bit, successive approximation (SAR) analog-to-digital converter (ADC) from Analog Devices, operating from a single power supply, VDD. It delivers a throughput of 400 kSPS with no missing codes, ensuring excellent linearity and accuracy for precision measurement applications. The device features a differential input, an internal conversion clock, and a versatile SPI-compatible serial interface that supports daisy-chaining and an optional busy indicator. Housed in a compact 10-lead MSOP package, the AD7690BRMZ-RL7 is ideal for space-constrained designs requiring high-resolution data acquisition. An ADC (analog-to-digital converter) is an electronic component that converts continuous analog signals into discrete digital values, enabling digital systems to process real-world signals. The AD7690 belongs to the PulSAR family of SAR ADCs, which are known for their high speed, low power, and excellent DC accuracy. SAR ADCs use a binary search algorithm to approximate the input voltage, offering a good balance between resolution, speed, and power consumption. They are widely used in industrial process control, medical instrumentation, and data acquisition systems where precision and reliability are paramount. Key features of the AD7690BRMZ-RL7 include 18-bit resolution with no missing codes, a maximum integral nonlinearity (INL) of ±1.5 LSB (±6 ppm of FSR), and a typical dynamic range of 102 dB at 400 kSPS. The device operates from a single 2.3V to 5.5V supply, with power scaling linearly with throughput, making it energy-efficient for battery-powered applications. The reference voltage is applied externally and can be set up to the supply voltage, providing flexibility in system design. The SPI-compatible interface supports daisy-chaining multiple ADCs on a single 3-wire bus, simplifying multi-channel data acquisition. Technically, the AD7690 uses a charge redistribution SAR architecture with an internal conversion clock, eliminating the need for an external clock source. The differential input reduces common-mode noise and improves signal integrity, making it suitable for bridge sensors and other low-level signal applications. The device also features a busy indicator, which can be used to synchronize data reads with conversion completion. The MSOP package offers a small footprint while maintaining excellent thermal performance, and the device is specified for operation over the industrial temperature range of -40°C to +125°C. Typical applications include precision data acquisition systems, industrial process control, medical instrumentation, and battery-powered portable devices. The AD7690BRMZ-RL7 is particularly well-suited for applications requiring high resolution and low power, such as portable medical monitors and field instruments. Its differential input and high dynamic range make it ideal for vibration analysis, weigh scales, and other sensor interfaces. When designing with the AD7690BRMZ-RL7, ensure that the reference voltage is stable and well-decoupled, as it directly affects conversion accuracy. Use a low-noise reference and place decoupling capacitors close to the VDD and REF pins. The SPI interface should be kept short and properly terminated to avoid signal integrity issues at high throughput rates.
AD7691BCPZ - 18-Bit 250kSPS Differential ADC | Analog Devices
The AD7691BCPZ is an 18-bit, 250 kSPS successive approximation register (SAR) analog-to-digital converter (ADC) from Analog Devices, housed in a 10-lead LFCSP-WD (3x3 mm) package. It features a fully differential input with a maximum integral nonlinearity (INL) of 1.5 LSB, ensuring high accuracy for precision measurement applications. The device operates from a single 2.3 V to 5.5 V supply and supports a separate VIO supply for logic interface compatibility with 1.8 V, 2.5 V, 3 V, or 5 V systems. An ADC (analog-to-digital converter) is an electronic component that converts continuous analog signals into discrete digital codes for processing by digital systems. The AD7691 is a SAR ADC, which uses a binary search algorithm to approximate the input voltage with high speed and low power. SAR ADCs are widely used in data acquisition systems, industrial process control, and medical instrumentation due to their excellent balance of speed, resolution, and power consumption. Key features of the AD7691BCPZ include a 250 kSPS throughput, 18-bit resolution, and a pseudo-differential input that can be configured for true differential operation. The SPI-compatible serial interface supports daisy-chaining multiple ADCs on a single 3-wire bus using the SDI input, and provides an optional busy indicator. The device also features a track-and-hold amplifier with a 1 MHz full-power bandwidth, making it suitable for high-frequency signal acquisition. The AD7691 uses a charge redistribution SAR architecture with an internal reference buffer, achieving a signal-to-noise ratio (SNR) of 101 dB and a total harmonic distortion (THD) of -118 dB at 1 kHz. The device operates over the industrial temperature range of -40°C to +85°C and is available in both MSOP and LFCSP packages. The LFCSP package (CPZ suffix) offers a compact footprint for space-constrained designs. Typical applications include battery-powered instruments, data acquisition systems, industrial process control, medical instrumentation, and seismic data acquisition. The high resolution and low noise make it ideal for precision sensor interfaces and vibration analysis. When designing with the AD7691, ensure proper decoupling of the AVDD and DVDD supplies with 10 µF and 0.1 µF capacitors placed close to the pins. The reference input should be driven by a low-impedance source, and the VIO supply must be matched to the host logic level to avoid interface damage.
AD7691BCPZRL - 18-Bit, 250kSPS PulSAR ADC | Analog Devices
The Analog Devices AD7691BCPZRL is an 18-bit, charge-redistribution, successive-approximation-register (SAR) analog-to-digital converter that operates from a single 2.3V to 5V power supply. It delivers up to 250 kSPS throughput with ±1.5 LSB maximum INL (typical ±0.75 LSB) and 102 dB dynamic range, housed in a 10-pin LFCSP-WD (3x3) package. The differential input architecture features an external reference up to VDD, allowing system designers to optimize dynamic range for sensors and industrial signals. An SAR ADC is a precision data converter that uses a binary-search algorithm through an internal capacitive DAC to digitize an input voltage in a single conversion cycle, producing a sample on demand with deterministic latency. SAR converters like the AD7691 sit in the hierarchy of analog-to-digital converters -> data converters -> signal chain ICs -> mixed-signal semiconductors. Compared with delta-sigma ADCs, SAR parts excel at multi-channel multiplexed systems and DC-to-multiplexed Nyquist applications because they do not require decimation filters and offer excellent DC accuracy. Key features of the AD7691BCPZRL include 18-bit no-missing-codes performance, an SPI-/QSPI-/MICROWIRE-/DSP-compatible serial interface, an optional SDI input for daisy-chaining multiple ADCs on a single 3-wire bus, an external REF pin, and a low 6 mW typical power dissipation at 250 kSPS with 5V supply. The PulSAR charge-redistribution core achieves true 18-bit resolution without latency, and the analog input span scales with the reference voltage so the same part serves 5V industrial, 3.3V logic, and low-voltage sensor rails. Typical applications include industrial process control loops, weigh scales and load-cell digitizers, precision data acquisition front-ends, instrumentation, sensor interfaces, and medical monitoring equipment. The wide 2.3V to 5V supply range and external reference allow a single BOM to span legacy 5V systems and modern 3.3V MCU platforms. When designing with this part, ensure the REF pin is decoupled with at least 10uF (low-ESR ceramic recommended) and that the analog input common-mode stays within the linear range supported by VDD/REF. Average power scales linearly with throughput, so duty-cycling the CONVST pin enables significant power savings in battery-powered sensor nodes. Designers should also add a small RC anti-alias filter on the input to remove out-of-band noise above the Nyquist frequency.
AD7693BCPZ - 16-Bit 500kSPS PulSAR ADC | Analog Devices
The AD7693BCPZ is a 16-bit, 500 kSPS successive approximation (SAR) analog-to-digital converter (ADC) from Analog Devices, part of the PulSAR family. It features a differential input, an SPI-compatible serial interface, and operates from a single 5V supply. The device is housed in a compact 10-lead LFCSP-WD (3x3 mm) package, making it suitable for space-constrained industrial and instrumentation applications. An ADC (analog-to-digital converter) is an electronic component that converts continuous analog signals into discrete digital values. The AD7693 is a SAR ADC, which uses a capacitive digital-to-analog converter and a comparator to perform binary search conversion. SAR ADCs are known for their high speed, low power, and excellent accuracy, making them ideal for data acquisition systems, medical instrumentation, and industrial process control. The AD7693 sits within the hierarchy: SAR ADC -> ADC -> data converter -> mixed-signal IC -> semiconductor. Key features of the AD7693BCPZ include 16-bit resolution with no missing codes, a throughput of 500 kSPS, and excellent linearity with INL/DNL of ±0.25 LSB typical and ±0.5 LSB maximum (±8 ppm of FSR). It achieves a dynamic range of 96.5 dB and a SINAD of 96.5 dB at 1 kHz input, ensuring high-fidelity signal acquisition. The device supports an input voltage range of 4.5V to 5V and operates over the industrial temperature range of -40°C to +85°C. Technically, the AD7693 uses a charge redistribution architecture with a precision reference input. It features a separate VIO supply for logic interface, allowing compatibility with 1.8V, 2.5V, 3V, or 5V logic. The SPI interface supports daisy-chaining multiple ADCs on a single 3-wire bus and provides an optional busy indicator. The device also includes a power-down mode for reduced power consumption between conversions. Typical applications include high-speed data acquisition systems, medical imaging, industrial process control, and battery-powered instrumentation. Its combination of high resolution, speed, and low power makes it ideal for portable and embedded systems where accuracy and efficiency are critical. When designing with the AD7693, ensure a clean, low-impedance reference voltage and adequate decoupling on the power supply pins. The differential input should be driven with a low-impedance source to maintain specified performance. Proper PCB layout, including a solid ground plane and short trace lengths, is essential for achieving the best SNR and linearity.
AD7693BCPZRL - 16-Bit 500kSPS SAR ADC, 10-LFCSP | Analog Devices
The Analog Devices AD7693BCPZRL is a 16-bit, 500 kSPS, charge-redistribution successive-approximation-register (SAR) analog-to-digital converter with a single pseudo-bipolar differential input, housed in a 10-lead LFCSP-WD (3x3) package. It operates from a single 4.5 V to 5.5 V analog supply, draws 7 mW typical power at 500 kSPS, and achieves ±1.0 LSB typical INL. The interface is SPI/QSPI/MICROWIRE/DSP-compatible and supports 1.8 V to 5 V logic via the separate VIO supply. A SAR ADC is a successive-approximation-register analog-to-digital converter that performs a binary search through an internal capacitive DAC to produce a digital output in N conversion cycles for N-bit resolution. The SAR architecture sits in the broader taxonomy of ADC -> data converter -> signal chain IC -> semiconductor. SAR ADCs are valued for low latency, deterministic throughput, and excellent DC accuracy, making them a leading choice for multiplexed data-acquisition systems and precision instrumentation. Key features include a 500 kSPS throughput with no latency between conversions, true differential input with wide common-mode range, and an optional external reference up to 5 V for input-span scaling. An SDI input enables daisy-chaining multiple ADCs onto a three-wire serial bus, while an optional BUSY indicator simplifies host timing on fast acquisitions. The 10-lead LFCSP package is pin-for-pin compatible with the 16-bit AD7687 and AD7688 and with the 18-bit AD7690 and AD7691, allowing PCB reuse across a resolution ladder. The internal architecture uses a charge-redistribution capacitive DAC and an on-chip clock for conversion, eliminating the need for an external high-speed serial clock. The analog-input structure accepts unipolar 0 V to VREF and true-bipolar ±VREF with proper driver design, and the device includes internal reference buffers to minimize analog-input current. Proprietary CMRR and THD optimization yields 102 dB typical SNR and −100 dB THD at the audio Nyquist, which is important for instrumentation front ends. Typical applications include industrial process control (4-20 mA loop monitoring), portable or rack-mount medical instrumentation, precision weigh scales and strain-gauge digitizers, multichannel multiplexed data-acquisition boards, and battery-powered test-and-measurement equipment. Designers choose the AD7693 when low noise, wide common-mode input, and fast throughput are required. When designing with the AD7693, pay attention to the input-driver bandwidth: the SAR input presents a switched-capacitor load that requires a settling-friendly op-amp (often the AD8021 or AD8251) and a small RC between driver and ADC input. Decouple VDD and VIO with low-ESR 10 µF and 0.1 µF ceramics placed as close as possible to the pins, and keep the REF capacitor (4.7 µF typical) close to the REF pin to preserve linearity. This page consolidates distributor pricing, drop-in alternatives, and practical design considerations not collected in the manufacturer datasheet, giving the engineer a single reference for sourcing, comparison, and PCB reuse decisions.
AD7694BCPZ - 16-Bit 250kSPS PulSAR ADC | Analog Devices
The AD7694BCPZ is a 16-bit, 250 kSPS, charge redistribution successive-approximation analog-to-digital converter (ADC) from Analog Devices, part of the PulSAR family. It operates from a single power supply, VDD, between 2.7 V and 5.25 V, and features a low power, high speed, 16-bit sampling ADC with no missing codes (B grade), an internal conversion clock, and a serial SPI-compatible interface port. The device is available in a 10-lead LFCSP (CP-10-2) package, offering a compact solution for precision data acquisition systems. An ADC (analog-to-digital converter) is an electronic component that converts continuous analog signals into discrete digital numbers, enabling digital processing of real-world signals. The AD7694 is a successive approximation register (SAR) ADC, which uses a binary search algorithm to determine the digital output. SAR ADCs are known for their high speed, low power, and excellent accuracy, making them ideal for applications such as industrial process control, medical instrumentation, and portable battery-powered devices. The AD7694 sits within the hierarchy: ADC -> SAR ADC -> PulSAR ADC -> precision ADC -> data acquisition system. Key features of the AD7694BCPZ include 16-bit resolution with no missing codes (B grade), a maximum sampling rate of 250 kSPS, and a typical power dissipation of only 4.5 mW at 5 V supply. The device offers a true differential analog input with a peak-to-peak voltage range of ±VREF, and an SPI-compatible serial interface that operates at clock speeds up to 50 MHz. The internal conversion clock eliminates the need for an external clock, simplifying system design. The device also includes a busy indicator and a power-down mode to reduce power consumption between conversions. Technically, the AD7694 uses a charge redistribution architecture with a capacitive DAC, achieving excellent linearity and low noise. The B grade ensures no missing codes, guaranteeing monotonicity over the full temperature range. The device operates over a temperature range of -40°C to +85°C, making it suitable for industrial environments. The LFCSP package provides a small footprint (3 mm x 3 mm) with an exposed pad for improved thermal performance. Typical applications include battery-powered instrumentation, portable medical devices, data acquisition systems, and industrial process control. The low power consumption and small package make it ideal for space-constrained designs. The SPI interface allows easy connection to microcontrollers and DSPs. When designing with the AD7694, ensure that the reference voltage (VREF) is stable and well-decoupled, as it directly affects conversion accuracy. The analog input should be driven by a low-impedance source to avoid sampling errors. The device requires a 10 µF decoupling capacitor on VDD and a 1 µF capacitor on VREF for optimal performance.
AD7699BCPZ - 16-Bit 8-Ch 500kSPS SAR ADC | Analog Devices
The AD7699BCPZ is a 16-bit, 8-channel, 500 kSPS successive approximation register (SAR) analog-to-digital converter (ADC) from Analog Devices. It operates from a single 5V supply and features a charge redistribution architecture with no missing codes. The device is available in a 20-lead LFCSP (4x4 mm) package, making it suitable for space-constrained industrial and instrumentation designs. An ADC (analog-to-digital converter) is an electronic component that converts continuous analog signals into discrete digital values for processing by digital systems. The AD7699 is a SAR ADC, which uses a binary search algorithm to approximate the input voltage with high speed and accuracy. SAR ADCs are widely used in data acquisition systems, motor control, and medical instrumentation due to their excellent balance of speed, resolution, and power consumption. Key features of the AD7699BCPZ include 16-bit resolution with no missing codes, an 8-channel multiplexer with unipolar single-ended, differential (GND sense), and pseudobipolar input modes, and a throughput of 500 kSPS. It offers an INL of ±0.5 LSB typical and ±1.5 LSB maximum (±23 ppm of FSR), ensuring high linearity for precision measurements. The device also features a dynamic range of [DATA_NEEDED: dynamic range] and operates over a temperature range of -40°C to +125°C. The AD7699 uses a charge redistribution SAR architecture with an internal track-and-hold circuit, providing accurate sampling without external sample-and-hold components. It includes a flexible serial interface that is compatible with SPI, QSPI, MICROWIRE, and DSPs, simplifying integration with microcontrollers and FPGAs. The device also offers a busy indicator and a conversion result readback feature, enhancing system design flexibility. Typical applications include multichannel data acquisition systems, industrial process control, medical instrumentation, and battery-powered portable devices. The AD7699's low power consumption and small package make it ideal for these applications, where board space and power efficiency are critical. When designing with the AD7699BCPZ, ensure proper decoupling of the VDD and VIO pins with 0.1 µF and 10 µF capacitors, and provide a clean reference voltage to achieve specified performance. The analog input range should be set according to the selected input mode, and the reference voltage should be stable and low-noise for optimal SNR.
AD7703AR - 20-Bit Sigma-Delta ADC, SOIC-20 | Analog Devices
The Analog Devices AD7703AR is a 20-bit sigma-delta analog-to-digital converter (ADC) in a 20-pin SOIC (AR suffix) package, offering a single differential input channel with serial output and a maximum output data rate of 4 kSPS at the specified master clock frequency (one distributor listing states up to 16 kSPS; per the Analog Devices AD7703 datasheet the nominal line rate is 4 kSPS). A sigma-delta ADC is a type of oversampling converter that digitizes an analog input by integrating it at a very high sampling rate and then decimating the result with a digital filter. Within the data-conversion hierarchy, the AD7703 sits above general-purpose successive-approximation ADCs in resolution, trading conversion speed for extremely high precision, and belongs to Analog Devices' LC2MOS (linear-compatible CMOS) data-acquisition family. Key features include 20-bit resolution with no missing codes, self-calibration and system calibration modes that remove offset and gain error, and a flexible serial interface that supports both internal and external clocking. Because the digital sinc filter shapes the noise floor, the device achieves effective performance that discrete multi-stage designs cannot match without extensive trimming. The LC2MOS process combines precision analog circuitry with low-power CMOS logic on one die. All dynamic characteristics, including input sampling frequency, output data rate, filter response, and calibration time, scale directly with the master clock f_CLKIN, as stated in the Analog Devices AD7703 datasheet (Rev. F), allowing designers to trade speed against filter settling and noise. Typical applications include precision transducer measurement (thermocouples, RTDs, load cells), weigh-scale front ends, industrial process-control data loggers, and instrumentation requiring resolution beyond 16 bits, where the sigma-delta architecture and on-chip calibration reduce external signal-conditioning complexity. Design consideration: allow full settling time after any calibration or input step; the digital filter's long impulse response means a single conversion immediately after a transient does not reflect the new input value. This page synthesizes distributor pricing, same-family drop-in grading alternatives, and practical design notes not consolidated in the manufacturer datasheet. Pricing and stock referenced as of 2026-10-11.
AD7703AR-REEL - 20-Bit Sigma-Delta ADC, 20-SOIC | Analog Devices
The Analog Devices AD7703AR-REEL is a 20-bit, single-channel, sigma-delta analog-to-digital converter (ADC) supplied in a 20-pin SOIC (SO-20) wide-body package and shipped on tape-and-reel. It operates from a single +5 V analog supply and a separate +5 V digital supply and converts a true differential analog input into a 20-bit serial output word at a maximum word rate of 4 kSPS. The device uses an on-chip digital filter that delivers >84 dB of 50 Hz mains-power rejection and forms the basis for high-resolution low-bandwidth conversion in instrumentation systems. A sigma-delta ADC is a type of oversampling converter that pushes quantization noise out of the low-frequency band and shapes it toward higher frequencies, where it is removed by a digital decimation filter. The AD7703 family sits within the Analog Devices precision-signal-chain portfolio, which itself belongs to the broader category of data converters (ADC/DAC) and ultimately mixed-signal ICs. Compared with successive-approximation (SAR) converters, sigma-delta parts trade absolute sample rate for resolution and integrated line-rejection, making them well suited to weighing scales, temperature/bridge transducers, and process-control loops where signals vary slowly but must be measured with high accuracy. Key features include 20 effective bits, a ±2.5 V true-differential analog input range, software-selectable unipolar/bipolar modes, an internal calibration controller with self- and system-calibration, and a flexible synchronous serial interface for read/write of the output data and control registers. The calibration engine removes offset and gain errors at both the modulator and the input front-end, allowing the part to retain >18-bit effective resolution over the industrial -40 °C to +85 °C range. The digital filter is configurable for first- and second-order sinc responses, letting the user trade first-notch frequency and settling time for the targeted acquisition rate. Typical applications are sensor signal conditioning for load-cell bridges, RTD and thermocouple cold-junction compensation, industrial weighing instruments, and low-bandwidth data-acquisition front-ends in PLC modules. Because the digital filter attenuates 50 Hz/60 Hz mains pickup, the AD7703 is often used as a stand-alone ADC in EMC-noisy industrial cabinets without additional analog filtering. When designing with this part, decouple both AVdd and DVdd locally with 10 µF + 0.1 µF ceramic capacitors, tie the REF IN/REF OUT pins into a low-TC buffered reference, and keep digital return currents away from the analog ground plane. This page synthesizes distributor pricing, drop-in alternatives, and application notes that go beyond the manufacturer datasheet to support faster board-level decisions.
AD7705BR-REEL - 16-Bit Sigma-Delta ADC, 2Ch, SOIC-16 | ADI
The Analog Devices AD7705BR-REEL is a 16-bit, 2-channel fully differential, sigma-delta analog-to-digital converter (ADC) intended for low-frequency measurement applications, housed in a 16-pin SOIC wide-body (7.50 mm) package and shipped on a 1,000-piece tape-and-reel. It accepts low-level input signals directly from a transducer and produces a serial digital output through an SPI/QSPI/MICROWIRE/DSP-compatible 3-wire interface. Key features include 16-bit resolution with no missing codes, +/-0.003% nonlinearity, less than 600 nV rms noise, a programmable-gain front end with gains from 1 to 128, on-chip digital filtering, and on-chip calibration that removes zero-scale and full-scale errors as well as temperature drift. Two fully differential input channels are multiplexed into the sigma-delta modulator and digital filter, providing effective resolution up to 16 bits at lower output update rates. The AD7705BR-REEL operates from a single 2.7 V to 3.3 V supply or a 4.75 V to 5.25 V supply, drawing only 1 mW of power at 3 V - making it attractive for loop-powered industrial transmitters. The sigma-delta architecture inherently shapes quantization noise away from the signal band, delivering excellent normal-mode rejection of 50 Hz/60 Hz mains interference when the output data rate is programmed to match the notch frequency. Typical applications include weigh scales, pressure transducers, RTD/strain-gauge signal conditioning, industrial process control, temperature measurement, and portable battery-powered instrumentation. The 3-wire serial interface simplifies isolation barrier design in 4-20 mA smart transmitters and lets a low-cost microcontroller configure the part and read conversion data. When designing with this part, decouple AVDD and DVDD separately with 0.1 uF capacitors placed as close to the pins as possible, and choose the output data rate (and master clock) to align the digital filter notch with 50 Hz or 60 Hz interference. The unbuffered analog input mode requires external input buffers when source impedance exceeds the value listed in the datasheet - see the input buffering section for resistor sizing.
AD7707BRUZ-REEL - 16-Bit Sigma-Delta ADC | Analog Devices
The Analog Devices AD7707BRUZ-REEL is a 16-bit, 3-channel sigma-delta analog-to-digital converter (ADC) housed in a 20-pin TSSOP package for low-frequency measurement applications. It accepts low-level transducer signals directly or high-level ±10 V signals, delivers 16-bit no-missing-code performance, ±0.003% accuracy, and on-chip calibration that eliminates zero-scale and full-scale endpoint errors including temperature-drift effects. A sigma-delta ADC is a converter architecture that uses oversampling and noise-shaping to achieve high resolution at low bandwidth; the AD7707 is part of that converter family, which sits within the broader analog-to-digital converter (ADC) category, itself a sub-category of data-conversion ICs and of the larger power management and signal-chain semiconductor hierarchy. The sigma-delta topology enables the AD7707 to integrate a digital filter, programmable gain amplifier, and reference circuitry on a single chip, removing the need for external signal-conditioning components in most thermocouple, strain-gauge, and process-control front ends. Key features include a true 16-bit analog front end with programmable gain amplifier (PGA) for low-level inputs, ±10 V high-level differential inputs, an on-chip digital filter, on-chip calibration, and a low-power 3 V/5 V supply interface. Typical supply current is around 1 mW (3 V/5 V operation), enabling battery-powered measurement instruments without external amplifiers. The serial interface simplifies galvanic isolation, while the 20-TSSOP outline supports compact industrial PC-board layouts. The sigma-delta converter architecture delivers intrinsic monotonicity, low integral non-linearity, and excellent noise immunity due to the modulator's oversampling ratio. The integrated digital filter provides programmable first-notch frequency, allowing trade-offs between output data rate and effective resolution for different transducer bandwidths. Combined with the on-chip PGA, the AD7707 can resolve microvolt-level sensor outputs without additional analog stages. Typical applications include industrial process-control analog front ends, weigh-scale signal conditioning, temperature measurement with thermocouples or RTDs, pressure and flow instrumentation, and battery-powered portable measurement equipment. The ±10 V differential input range also supports general-purpose data-acquisition boards using 4-20 mA loop-powered transducers. When designing with this device, allocate the analog and digital supply pins (AVDD/DVDD) properly and decouple each with a 0.1 µF ceramic capacitor close to the package. Avoid running digital clock traces under the analog input pins to prevent digital-noise coupling into the front-end input. This page synthesises distributor live pricing, drop-in pin-compatible alternatives and practical design notes that consolidate information from the Analog Devices datasheet, DigiKey, Mouser, and the FindIC cross-reference database.