ADC102S051CIMMX/NOPB - 10-Bit 2-Ch 500ksps SAR ADC | Texas Instruments
MPN: ADC102S051CIMMX/NOPB ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.2 | $3.20 |
| 10 | $2.81 | $28.10 |
| 100 | $2.2 | $220.00 |
| 500 | $1.79 | $895.00 |
| 1,000 | $1.49 | $1,490.00 |
| 3,500 | $1.3 | $4,550.00 |
ADC102S051CIMMX/NOPB Overview
An SAR ADC is a successive-approximation analog-to-digital converter that uses a binary-search algorithm against an internal precision DAC to digitize an analog input, one bit per clock cycle. SAR ADCs sit in the broader hierarchy of data converters (ADC -> Nyquist ADC -> SAR ADC -> mixed-signal IC -> semiconductor) and are valued for low latency, deterministic behavior, and excellent DC accuracy, making them the standard choice for multiplexed multi-channel data acquisition systems where small numbers of analog inputs must be digitized with predictable timing.
Key features include two single-ended analog input channels with a multiplexer, an external reference input, a true differential input stage, and a straight-binary serial output that is SPI/QSPI/MICROWIRE/DSP-frame compatible. The device guarantees 10-bit no-missing-codes performance over the full sample-rate range, supports an industrial -40C to +85C operating range, and uses an external clock for the conversion process, enabling synchronization in multi-ADC systems.
Typical applications include portable instrumentation, multi-channel data loggers, optical-module monitoring, point-of-load system monitoring, and embedded industrial control. Designers favor the ADC102S051 for systems that need more than one analog channel with deterministic latency, plus a serial interface that connects directly to microcontrollers and DSPs without glue logic.
When laying out the PCB, place the 0.1uF decoupling capacitor as close as possible to the VDD pin and route the analog inputs as a differential pair (AIN+/AIN-) with a solid ground plane. Hold SCLK low during CS high to prevent spurious conversions and respect the tACQ and tCONV timing budgets in the manufacturer datasheet to retain full-throughput accuracy at 500 ksps.
This page synthesizes distributor pricing, drop-in VSSOP-8 alternatives, and practical design guidance that complements the manufacturer datasheet, helping engineers shorten BOM validation and layout review cycles.
Drop-in alternatives for ADC102S051CIMMX/NOPB — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with ADC102S051CIMMX/NOPB (same form factor and footprint) — differing in Number of Channels, Package, Resolution, Operating Temperature, Digital Interface.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ADC102S051CIMM/NOPB
✅ Drop-In📋 Reference alternative (not in catalog)
ADC102S021CIMM/NOPB
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
ADC102S051CIMMX
✅ Drop-In✓ In Stock
$1.84 / Unit
View Datasheet →ADC122S021CIMM/NOPB
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
ADC081S051CISDX/NOPB
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$1.62 / Unit
View Datasheet →ADC081S021CISDX/NOPB
✅ Drop-In📋 Reference alternative (not in catalog)
ADC102S051CIMMX/NOPB Maximum Ratings & Electrical Characteristics
| Resolution | 10 bits |
| Number of Channels | 2 (single-ended / 1 differential pair) |
| Architecture | SAR (Successive Approximation Register) |
| Sample Rate Range | 200 ksps to 500 ksps |
| Input Type | Single-ended (2-ch) / True Differential |
| Supply Voltage (VDD) | +2.7 V to +5.25 V |
| Power Consumption (typ.) | 2.7 mW at 3 V; 8.6 mW at 5 V |
| Digital Interface | SPI / QSPI / MICROWIRE / DSP-compatible serial |
| Number of Pins | 8 |
| Package | 8-MSOP / Mini-SOIC (VSSOP, 3.00 mm width) |
| Operating Temperature Range | -40 C to +85 C (industrial) |
| RoHS Status | Compliant |
| Lead-Free / NOPB | Yes (NOPB suffix indicates lead-free / Pb-free) |
ADC102S051CIMMX/NOPB Pin Configuration
| Pin 1 | VA — Analog supply voltage for the analog input section (decouple with 0.1uF to GND) |
| Pin 2 | AIN1 — Analog input channel 1 (single-ended or IN+ when used differentially) |
| Pin 3 | AIN2 — Analog input channel 2 (single-ended or IN- when used differentially) |
| Pin 4 | GND — Ground reference for both analog and digital sections |
| Pin 5 | VA / REF — Reference input / analog supply input (connect to VA or external reference) |
| Pin 6 | CS — Chip-select input (active-low; falling edge initiates a conversion cycle) |
| Pin 7 | SCLK — Serial clock input from SPI master |
| Pin 8 | DOUT — Serial data output; emits straight-binary conversion result on SCLK rising edges |
Typical Applications
ADC102S051CIMMX/NOPB is suitable for 7 applications: Portable Multi-Channel Data Acquisition, Industrial Process Control / PLC Analog Input Modules, Optical Module / Laser Bias Monitoring, Battery Management System (BMS) Cell Monitoring, Medical Patient Monitoring Sensors, Audio / Voice Capture Auxiliary ADC, Automotive Sensor Interface Modules.
Portable Multi-Channel Data Acquisition
The ADC102S051CIMMX/NOPB suits battery-powered, multi-channel data loggers that need 2 single-ended analog inputs with deterministic SAR timing. Its 2.7 mW typical power at 3V lets a 4-AA handheld logger run for 100+ hours on a single battery set, while the 500 ksps ceiling oversamples the 10-bit output for software averaging and improves effective resolution. Used with a 2.5V external reference, two sensors (such as a strain gauge bridge output and a thermocouple amplifier) digitize simultaneously through the internal multiplexer. The SPI/QSPI/MICROWIRE-compatible serial interface ties directly to an MSP430 or STM32 MCU without level translation, reducing BOM cost. Per the TI datasheet, the device samples across the full 200-500 ksps range, so the same ADC covers both low-power idle acquisition (200 ksps) and burst-mode logging (500 ksps).
Recommended
Industrial Process Control / PLC Analog Input Modules
PLC analog input cards and process-control modules commonly use the ADC102S051CIMMX/NOPB to digitize 4-20 mA or 0-10V signals after front-end conditioning. Two channels per ADC reduce the BOM count versus single-channel parts, and the industrial -40C to +85C rating handles cabinet and factory-floor thermal stress. Pin-compatible with the 12-bit ADC122S021 family, the same PCB can accept either 10-bit or 12-bit ADC depending on the accuracy tier required. At 500 ksps the part oversamples easily for digital averaging, achieving effective ENOB above 10.5 bits for slow process signals. According to TI, the SAR architecture gives deterministic per-sample latency, which simplifies closed-loop control loops where sample timing jitter cannot be tolerated.
Recommended
Optical Module / Laser Bias Monitoring
SFP, QSFP and XFP optical transceiver modules embed small ADCs to monitor laser bias current, TEC voltage, and received optical power. The ADC102S051CIMMX/NOPB's 8-pin VSSOP footprint fits inside the tight mechanical envelope of these hot-pluggable modules while the two input channels digitize both the bias and monitor photodiode signals through a single chip. Its 2.7-5.25V supply range lets it share the module's existing 3.3V rail, eliminating an extra regulator. The SPI interface is short and bus-friendly, so a host microcontroller can poll multiple ADCs on a single SPI bus. Per the TI datasheet, the device supports industrial temperature ranges appropriate for the inside of a network switch where ambient can reach +70C.
Recommended
Battery Management System (BMS) Cell Monitoring
Multi-cell battery monitors in lithium-ion packs use the ADC102S051CIMMX/NOPB to measure individual cell voltages and pack current sense amplifier outputs. Two single-ended inputs map naturally to one cell voltage and one current shunt, with the SAR's zero-latency conversion aligning each reading to the same moment in time. The 5V-tolerant analog inputs accept typical 4.2V Li-ion cell voltages without an external divider. At 500 ksps the converter oversamples the slow-changing cell voltage, enabling software low-pass filtering that improves effective resolution beyond 10 bits. According to TI, the converter's deterministic latency simplifies coulomb-counting math in the host MCU. The 8-pin VSSOP package fits between cells on tightly-spaced battery PCBs.
Recommended
Medical Patient Monitoring Sensors
Portable patient monitors - pulse oximeters, ambulatory ECG patches, glucose meters - rely on the ADC102S051CIMMX/NOPB to digitize analog front-end outputs from photodiode amplifiers and electrode signal chains. Its 2.7 mW power at 3V preserves battery runtime in 24-hour wearable form factors, while two inputs digitize both red and IR photodiode channels simultaneously for SpO2 calculation. The industrial temperature rating supports skin-contact and body-proximity thermal envelopes. Pin-compatible with the 12-bit ADC122S021, designers can step up to higher resolution on the same PCB for premium product tiers. Per TI, the SPI/QSPI/MICROWIRE-compatible serial output talks directly to common low-power MCUs used in wearable medical electronics.
Recommended
Audio / Voice Capture Auxiliary ADC
Cost-sensitive audio accessories - headsets, conference speakerphones, and two-way intercoms - use the ADC102S051CIMMX/NOPB as an auxiliary slow-channel digitizer for push-to-talk buttons, sidetone level, or VAD (voice-activity-detection) microphone monitoring. While not a high-fidelity audio ADC, its 10-bit resolution is sufficient for envelope-amplitude or battery-voltage monitoring alongside a dedicated audio codec. The 8-pin VSSOP footprint fits on space-constrained accessory PCBs, and the 2-channel input lets a single ADC read both a microphone bias monitor and a battery divider. According to TI, the SPI output ties to a Bluetooth audio SoC with no extra glue logic, keeping the BOM at a minimum.
Recommended
Automotive Sensor Interface Modules
Body and chassis sensor modules in entry-level automotive electronics - seat-occupancy detectors, ambient-light sensors, simple climate-control thermistor bridges - often use a small SAR ADC such as the ADC102S051CIMMX/NOPB on sub-modules. The 8-pin VSSOP/MSOP package and 2.7-5.25V supply range tolerate 12V battery transients after regulation, while the two analog inputs digitize two sensor signals per chip. While the standard part is industrial-grade (-40C to +85C), it is used inside climate-controlled cabin electronics where the industrial envelope is sufficient. According to TI, the SPI digital interface is robust against the noise environments typical of in-vehicle harnesses. For under-hood or AEC-Q100 applications, designers move to AEC-Q100 qualified pin-compatible variants in the same family.
Recommended
Recommended Products Summary
Engineering reference data for ADC102S051CIMMX/NOPB — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ADC102S051CIMM/NOPB | ADC102S021CIMM/NOPB | ADC102S051CIMMX | ADC122S021CIMM/NOPB | ADC081S051CISDX/NOPB |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 8-MSOP (VSSOP, 3.0 mm) | 8-MSOP (VSSOP, 3.0 mm) - same | 8-MSOP (VSSOP, 3.0 mm) - same | 8-MSOP (VSSOP, 3.0 mm) - same | 8-MSOP (VSSOP, 3.0 mm) - same | 6-WSON - smaller footprint, same family |
| Resolution | 10 bits | 10 bits - same | 10 bits - same | 10 bits - same | 12 bits | 8 bits |
| Channels | 2 (1 differential pair) | 2 - same | 2 - same | 2 - same | 2 - same | 1 |
| Sample Rate | 200 - 500 ksps | 200 - 500 ksps - same | 50 - 200 ksps | 200 - 500 ksps - same | 50 - 200 ksps | 200 - 500 ksps |
| Supply Voltage | +2.7 V to +5.25 V | +2.7 V to +5.25 V - same | +2.7 V to +5.25 V - same | +2.7 V to +5.25 V - same | +2.7 V to +5.25 V - same | +2.7 V to +5.25 V - same |
| Power Consumption (typ.) | 2.7 mW at 3 V / 8.6 mW at 5 V | 2.7 mW / 8.6 mW - same | lower (50-200 ksps rating) | 2.7 mW / 8.6 mW - same | slightly higher at 5 V | similar, 1 channel |
| Interface | SPI / QSPI / MICROWIRE / DSP | SPI / QSPI / MICROWIRE / DSP - same | SPI / QSPI / MICROWIRE / DSP - same | SPI / QSPI / MICROWIRE / DSP - same | SPI / QSPI / MICROWIRE / DSP - same | SPI / QSPI / MICROWIRE / DSP - same |
| Lead-Free / RoHS | Yes (NOPB suffix) | Yes (NOPB) | Yes (NOPB) | No (Pb-bearing terminal finish) | Yes (NOPB) | Yes (NOPB) |
Key Differentiators
- Fully specified over 200-500 ksps sample rate range (vs ADC102S021CIMM/NOPB)
- 10-bit resolution with 2-channel true-differential input (vs ADC081S051CISDX/NOPB)
- Pin-compatible upgrade path to 12-bit ADC122S021CIMM/NOPB (vs ADC122S021CIMM/NOPB)
Design Notes
Place a 0.1uF ceramic decoupling capacitor as close as possible to the VA/VDD pin, with a wide, short trace to a low-impedance ground pour. Route AIN1/AIN2 as a guarded differential pair if used differentially; for single-ended use, ground the unused AIN pin with a short trace to avoid crosstalk. Avoid running digital traces directly under the analog inputs.
Hold SCLK idle-low while CS is high to prevent spurious conversions; the falling edge of CS initiates acquisition. According to TI, respect the tACQ acquisition window before the conversion begins, or accuracy degrades at 500 ksps. A clean external reference is mandatory - the noise floor of the ADC tracks the reference, so use a low-noise reference such as REF3025 or REF3330 rather than the supply rail.
Estimated: at 500 ksps with a 5V supply the part draws ~1.7 mA (8.6 mW); on a 3.3V rail it drops to ~0.8 mA (2.7 mW). Decoupling with a 10uF bulk cap plus the local 0.1uF avoids supply droop during acquisition bursts and prevents reference ringing on shared rails.
Do not exceed VA + 0.3V on the analog inputs or permanent damage can occur. If your sensor signal exceeds VA, add an external clamp or divider. CS must not be left floating - if not driven by the MCU, tie CS to GND through a 100k resistor to avoid random wake-ups that inject noise into adjacent analog channels.
Compliance Information
NOPB suffix on the part number indicates lead-free terminal finish per TI's RoHS-compliant material declaration set. AEC-Q100 not qualified - this is the standard industrial-grade (-40C to +85C) variant; for automotive applications choose a Q1-suffix TI SAR ADC from the same family.
