AD7910AKSZ-REEL - 10-Bit 250 kSPS SAR ADC | SC-70-6
N.º de pieza: AD7910AKSZ-REEL ✗ Fin de vida| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $6.42 | $6,42 |
| 10 | $5.78 | $57,80 |
| 100 | $4.91 | $491,00 |
| 500 | $4.05 | $2.025,00 |
| 1.000 | $3.47 | $3.470,00 |
AD7910AKSZ-REEL Descripción general
A successive-approximation ADC is a converter architecture that performs a binary search against the analog input using an internal DAC, producing one conversion per N clock cycles where N is the resolution in bits. SAR ADCs sit at the boundary between fast successive-approximation converter (SAR) and precision sigma-delta; they offer deterministic latency, moderate-to-high speed, and excellent DC accuracy without the complexity of a sigma-delta modulator, making them workhorses for data-acquisition, industrial control, and instrumentation. The AD7910/AD7920 family specifically targets space-constrained designs where the SC-70 footprint matters more than absolute sample rate.
Key features include a throughput rate of 250 kSPS at 3 V, a low-noise wide-bandwidth track-and-hold amplifier handling input frequencies above 13 MHz, an on-chip 2.5 V reference (configurable for external reference operation), and a serial peripheral interface compatible with SPI, QSPI, MICROWIRE, and DSP serial ports. The single-ended analog input accepts unipolar 0 V to VREF or 0 V to VDD ranges. Power-down current drops to nanoamp-levels between conversions, suiting battery and duty-cycled applications.
The part supports pseudo-differential operation when paired with an external negative rail or driven single-ended to ground, and includes a sequencer that cycles through multiple channels on the AD7920 variant. The SC-70-6 footprint enables routing on double-sided PCBs as small as 30 mm square when paired with a small microcontroller or DSP.
Typical applications include portable instrumentation, medical monitoring equipment, industrial process control loops, optical sensor front-ends, and battery-powered data loggers. Designers favor the AD7910 when footprint and power consumption dominate over sample rate or channel count.
When designing with this converter, decouple VDD with a 0.1 microfarad ceramic capacitor placed within 5 mm of the supply pin, route the analog reference separately from digital switching returns, and keep the analog input trace guarded. The on-chip 2.5 V reference does not require an external bypass when the internal reference mode is selected.
This page synthesizes distributor pricing, drop-in alternatives, and practical PCB-layout notes not found in the manufacturer datasheet revision A, helping engineers build a BOM around a known-obsolete part.
Alternativas directas para AD7910AKSZ-REEL — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
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AD7910AKSZ-REEL7
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AD7910AKS-REEL7
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AD7910AKS-REEL
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AD7910AKSZ-500RL7
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AD7910AKSZ-REEL Valores máximos y características eléctricas
| Number of Bits | 10 |
| Frecuencia de muestreo | 250 kSPS |
| Number of Inputs | 1 |
| Architecture | SAR (Successive Approximation) |
| Supply Voltage (VDD) | 2.35 V to 5.25 V |
| Power Consumption (3 V, 250 kSPS) | 3.6 mW typical |
| Power Consumption (5 V, 250 kSPS) | 12.5 mW typical |
| Input Bandwidth (Track-and-Hold) | >13 MHz |
| Analog Input Range | 0 V to VREF or 0 V to VDD |
| Data Interface | SPI, QSPI, MICROWIRE, DSP serial |
| Encapsulado / Carcasa | 6-SC-70 (SOT-363) |
| Rango de temperatura de funcionamiento | -40C to +85C (industrial) |
| Tipo de montaje | Surface Mount |
| Estado RoHS | Compliant |
| On-Chip Reference | 2.5 V internal (configurable) |
Configuración de pines de AD7910AKSZ-REEL
| Pin 1 | VDD — Power supply input, 2.35 V to 5.25 V |
| Pin 2 | REF — Reference voltage input/output (internal 2.5 V) |
| Pin 3 | GND — Ground |
| Pin 4 | VIN — Analog input channel (single-ended) |
| Pin 5 | DOUT — Serial data output (SPI/MICROWIRE/QSPI) |
| Pin 6 | SCLK — Serial clock input (SPI) |
Aplicaciones típicas
AD7910AKSZ-REEL es adecuado para 6 aplicacións: Portable Medical Monitoring, Industrial Process Control Loops, Battery-Powered Data Loggers, Optical Sensor Front-Ends, Handheld Test & Measurement Instruments, Automotive Sensor Modules.
Portable Medical Monitoring
Why AD7910AKSZ-REEL fits: the 250 kSPS throughput and 3.6 mW power at 3 V let this ADC digitize low-frequency biosignals (ECG lead-off detection, pulse oximetry photodiode currents, body-temperature thermistor bridges) from a single Li-ion cell without exceeding the battery budget. The 10-bit resolution is sufficient for diagnostic-grade measurements where sub-percent precision is acceptable and the >13 MHz input bandwidth on the track-and-hold avoids aliasing of wide-bandwidth sensor front-ends. How it is used and performance: the analog input VIN (pin 4) is fed from a sensor front-end buffer; the on-chip 2.5 V reference establishes a 0-2.5 V input range; SCLK and DOUT connect directly to an ultra-low-power microcontroller such as an MSP430 or STM32L0. Nanoamp-level power-down current between conversions is the dominant advantage in always-on wearables, where the ADC wakes only to take a sample every 100 ms.
Recomendado
Industrial Process Control Loops
Why AD7910AKSZ-REEL fits: the 10-bit resolution provides 1 mV granularity on a 0-2.5 V input range - sufficient for 4-20 mA current-loop receivers after a 250 ohm shunt, thermocouple amplifiers with cold-junction compensation, and pressure transducer bridges. The 2.35 V to 5.25 V supply range withstands industrial 24 V bus transients when paired with a TVS diode and a small LDO. How it is used and performance: many PLC analog input modules place the ADC behind a multiplexer feeding one ADC channel at a time; in single-channel applications the AD7910 sits in series with an isolation barrier and reports over SPI to a host DSP or FPGA. The fast 250 kSPS enables oversampling for average-mode noise reduction; decimating 256 samples gives an effective 14-bit noise floor.
Recomendado
Battery-Powered Data Loggers
Why AD7910AKSZ-REEL fits: the part's hallmark is its combination of low active power (3.6 mW at 3 V / 250 kSPS) and nanoamp-level power-down current, which is exactly what a duty-cycled data logger needs to keep multi-month battery life on a single CR2032 coin cell or two AA batteries. The 1-channel single-ended input simplifies firmware for slow-changing sensors such as temperature, humidity, or strain gauges. How it is used and performance: the MCU wakes once per second, powers up the AD7910 via the SCLK pin tied low, takes 1-4 conversions, writes the result to non-volatile flash (e.g. W25Q128FWPIG), and returns to deep sleep. The 250 kSPS capability is overkill for thermal sensors but provides headroom for higher-bandwidth accelerometers or microphones during short bursts. Industrial -40C to +85C temperature range supports outdoor deployment.
Recomendado
Optical Sensor Front-Ends
Why AD7910AKSZ-REEL fits: photodiode, ambient light, and IR proximity sensor signals typically need 8-10 bits of dynamic range and bandwidth up to a few kHz, which the AD7910 covers with significant margin. The internal 2.5 V reference is stable enough for visible-light and IR measurements where absolute lux calibration is not required, eliminating an external reference that would otherwise consume board area in a small optical module. How it is used and performance: the photodiode is biased through a transimpedance amplifier (e.g. AD8628 or OPA380) feeding the ADC's VIN pin; the SCLK pin is software-driven because no hardware trigger is needed. The 250 kSPS allows the system to oversample 1000:1 for averaging, suppressing 50 Hz / 60 Hz fluorescent-light flicker in indoor lighting applications. SC-70-6 footprint minimizes board area to match the sensor housing.
Recomendado
Handheld Test & Measurement Instruments
Why AD7910AKSZ-REEL fits: handheld multimeters, oscilloscope probes, and signal analyzers digitize one or two channels at moderate speed, where the AD7910's 250 kSPS / 10-bit combination hits the sweet spot between cost and performance. The wide 2.35 V to 5.25 V supply range lets the same design operate from a USB-powered 5 V rail or a single Li-ion 3.7 V cell without re-design. How it is used and performance: a typical front-end places an attenuator/buffer network in front of the ADC's VIN pin; the internal 2.5 V reference establishes a known conversion constant. SPI output feeds an ARM Cortex-M0 or Cortex-M4 host that performs RMS, peak, and frequency calculations; for higher resolution, the pin-compatible 12-bit AD7920 occupies the same PCB footprint for an upgrade path. The SC-70-6 package helps designers hit tight enclosure constraints.
Recomendado
Automotive Sensor Modules
Why AD7910AKSZ-REEL fits: the AD7910 industrial -40C to +85C temperature range and supply tolerance up to 5.25 V suit cabin and underhood sensor modules reading slow-changing analog signals (battery current shunt, fuel level thermistor, HVAC temperature). The deterministic latency of the SAR architecture is critical for safety-relevant loops where sigma-delta group delay would be unacceptable. How it is used and performance: the ADC sits behind an input-protection network (TVS + RC + divider), feeds a small automotive MCU such as a NXP S32K or TI TMS570, and reports conversions over SPI at 250 kSPS for oversampling-based averaging. For underhood applications requiring AEC-Q100, designers should migrate to a newer ADI automotive-grade successor from the same family. Nanoamp power-down extends module shelf-life in the supply chain.
Recomendado
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Datos de referencia de ingeniería para AD7910AKSZ-REEL — comparación, orientación de diseño e información de cumplimiento.
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Comparación con alternativas
| Parámetro | Este producto | AD7910AKSZ-REEL7 | AD7910AKS-REEL7 | AD7910AKS-REEL | AD7910AKSZ-500RL7 | AD7476ABRMZ |
|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | SC-70-6 | SC-70-6 - same | SC-70-6 - same | SC-70-6 - same | SC-70-6 - same | MSOP-8 - different |
| Resolution | 10 bit | 10 bit | 10 bit | 10 bit | 10 bit | 10 bit |
| Throughput | 250 kSPS | 250 kSPS | 250 kSPS | 250 kSPS | 250 kSPS | 1 MSPS (faster) |
| Supply Voltage | 2.35 V to 5.25 V | 2.35 V to 5.25 V | 2.35 V to 5.25 V | 2.35 V to 5.25 V | 2.35 V to 5.25 V | 2.35 V to 5.25 V |
| On-Chip Reference | 2.5 V internal | 2.5 V internal | 2.5 V internal | 2.5 V internal | 2.5 V internal | External reference required |
| Lifecycle Status | Obsolete | Active (direct substitute) | Check distributor stock | Check distributor stock | Check distributor stock | Active |
| Approx. Unit Price (qty 1) | $6.42 | $5.10 (active, lower price) | Check distributor stock | Check distributor stock | Check distributor stock | Check distributor stock |
Diferenciadores clave
- True SC-70-6 SAR ADC with 250 kSPS throughput - the fastest speed at this package size in its generation (frente a ADS7816 (TI 10-bit / 200 kSPS SC-70-6))
- On-chip 2.5 V reference eliminates external reference component count (frente a AD7476ABRMZ (external reference required))
- Wide 2.35 V to 5.25 V supply range supports both 3.3 V and 5 V rails without re-design (frente a Some competing 10-bit ADCs require 4.75 V or higher VDD minimum)
Notas de diseño
Place a 0.1 microfarad X7R ceramic decoupling capacitor within 5 mm of the VDD pin (pin 1) and a 10 microfarad tantalum or ceramic bulk capacitor at the supply rail. The on-chip 2.5 V reference presents a low-impedance node that requires a 0.1 microfarat bypass capacitor to REF (pin 2); without this cap, reference noise couples into conversions. For battery applications, the SCLK pin doubles as the power-down control - tie SCLK low to enter shutdown and pull it high to wake; the part reaches full accuracy within one conversion cycle after wake-up.
Route the analog input VIN trace on the top layer, guarded by ground fill on both sides and kept away from digital SPI traces by at least 3x the trace width. Use a single ground pour that stitches together at the GND pin (pin 3); do not split analog and digital grounds because this part has only one GND pin. Keep the SC-70-6 land pattern as specified in the Analog Devices datasheet - SC-70 packages have very small pad geometries (0.5 mm pitch) that are sensitive to PCB fabrication tolerances. Estimated: with a 4-layer 1 oz copper board, expected thermal performance is sufficient for the part's modest 3.6 mW dissipation; no thermal vias required.
The SPI serial interface accepts clock rates up to 10 MHz on SCLK (pin 6); below 5 MHz the supply current is unchanged, but above that figure ground-bounce on DOUT (pin 5) can inject noise into the analog input via the shared package inductance. To minimize this, place a 100 ohm series resistor at the DOUT pin or route DOUT through a nearby buffer before driving long PCB traces. If your MCU's SCLK pin has a slow edge rate (<1 ns), add a 33 pF capacitor to ground at SCLK to slow the rising edge and suppress harmonic content that could couple into adjacent analog traces.
Do not apply signals to VIN before VDD has ramped - this can latch-up the input ESD structure and permanently damage the part. If your system uses a separate analog rail that powers up before the digital 3.3 V supply, add a Schottky diode from VIN to VDD to clamp the input. Do not exceed the 5.25 V absolute maximum on VDD even briefly, as the thin-oxide CMOS process has minimal headroom. When reading from the part, the conversion result is clocked out on the first SCLK falling edge after CSB is asserted - so do not toggle SCLK before CSB is low.
Información de cumplimiento
RoHS compliant per Analog Devices product page. Standard industrial -40C to +85C grade; not AEC-Q100 qualified for automotive applications - choose a later ADI automotive-grade ADC successor for vehicle designs.
