ADC12L032CIWM - 12-Bit+Sign SAR ADC, 2-Ch, SOIC-20 | TI
MPN: ADC12L032CIWM ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $18.5 | $18.50 |
| 10 | $16.2 | $162.00 |
| 100 | $13.85 | $1,385.00 |
| 500 | $11.95 | $5,975.00 |
| 1,000 | $10.4 | $10,400.00 |
ADC12L032CIWM Overview
What is an SAR ADC? A successive-approximation register analog-to-digital converter is a precision data-conversion topology that uses a binary-search algorithm to convert an analog input into a digital code. SAR ADCs sit in the converter hierarchy between flash converters (fastest, lowest resolution) and sigma-delta converters (highest resolution, slower). They offer an attractive trade-off of moderate speed, high accuracy, modest power, and a small footprint, making them the workhorse of industrial process control, instrumentation, and portable data-acquisition systems.
Key differentiating specifications include 12-bit-plus-sign resolution, on-chip self-calibration that reduces offset and gain errors at power-up and on demand, a flexible serial interface compatible with NSC MICROWIRE and SPI, and 2 analog input channels that expand to 1, 2, or pseudo-differential configurations via the MUX. The device is specified for operation from -40C to +85C (industrial grade), making it robust for harsh environments while remaining in a compact surface-mount package.
Typical applications include portable instrumentation, sealed-battery data loggers, isolated sensor read-out, panel-meter front-ends, and multichannel sensor-conditioning boards. The 3.3 V supply and low current draw align naturally with lithium-thionyl-chloride and lithium-ion battery chemistries, and the serial interface minimizes microcontroller pin count in space-constrained designs.
When designing with this ADC, ensure the analog supply is decoupled with a 0.1 uF ceramic capacitor placed as close as possible to the AVDD pin, and route digital lines away from analog traces. The self-calibration cycle must be initiated after power-up and after any major temperature change to maintain specified accuracy over temperature and time.
Drop-in alternatives for ADC12L032CIWM — 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 ADC12L032CIWM (same form factor and footprint) — differing in Self-Calibration, Architecture, Analog Supply Voltage, Data Interface, Input Type.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ADC12032CIWM/NOPB
✅ Drop-In✓ In Stock
$4.75 / Unit
View Datasheet →ADC12L030CIWM/NOPB
✅ Drop-In✓ In Stock
$9.31 / Unit
View Datasheet →ADC12H032CIWM
✅ Drop-In✓ In Stock
$10.45 / Unit
View Datasheet →ADC12L032CIWM Maximum Ratings & Electrical Characteristics
| Resolution | 12-bit plus sign |
| Architecture | SAR (Successive Approximation Register) |
| Number of Analog Input Channels | 2 (single-ended) / 1 (differential) |
| Sample Rate (max) | 73 ksamples/s (0.73 MHz) |
| Conversion Time | 8.8 us |
| Analog Supply Voltage | 3.0 V to 5.5 V |
| Digital Supply Voltage | 3.0 V to 5.5 V |
| Data Interface | NSC MICROWIRE, Serial, SPI-compatible |
| Input Type | Pseudo-differential / Single-ended |
| Self-Calibration | Yes (on-chip, on-demand) |
| Sample/Hold | Integrated |
| Operating Temperature | -40C to +85C (industrial grade) |
| Package | 20-pin SOIC Wide (300 mil, EIAJ) |
| Mounting Type | Surface Mount |
ADC12L032CIWM Pin Configuration
| Pin 1 | AVDD — Analog supply (+3.0 V to +5.5 V) |
| Pin 2 | VREF — Reference voltage input |
| Pin 3 | AGND — Analog ground |
| Pin 4 | IN+ — Positive analog input |
| Pin 5 | IN- — Negative analog input |
| Pin 6 | SCLK — Serial clock input |
| Pin 7 | DOUT — Serial data output |
| Pin 8 | DIN — Serial data input |
| Pin 9 | CS — Chip select (active low) |
| Pin 10 | CAL — Calibration trigger |
| Pin 11 | DGND — Digital ground |
| Pin 12 | DVDD — Digital supply (+3.0 V to +5.5 V) |
| Pin 13 | NC — Not connected |
| Pin 14 | NC — Not connected |
| Pin 15 | NC — Not connected |
| Pin 16 | NC — Not connected |
| Pin 17 | NC — Not connected |
| Pin 18 | NC — Not connected |
| Pin 19 | NC — Not connected |
| Pin 20 | MUX — Channel select / mode input |
Typical Applications
ADC12L032CIWM is suitable for 6 applications: Portable Battery-Operated Data Loggers, Industrial Process Sensor Front-Ends, Patient Monitoring Sensor Pads, Instrumentation and Panel Meters, Remote Environmental Sensor Networks, Smart Sensor Conditioning Modules.
Portable Battery-Operated Data Loggers
The ADC12L032CIWM is well-matched to portable battery data loggers because of its 3.0-5.5 V single-supply operation, low current draw, and integrated sample/hold, per the manufacturer datasheet. A typical circuit places two sensors (temperature and pressure) at the analog inputs and reads the converted values via the SPI port into an ultra-low-power MCU. The 8.8 us conversion time and 0.73 MSPS throughput allow scanning thousands of samples per day without stressing the battery budget.
Recommended
Industrial Process Sensor Front-Ends
For industrial process-control applications, the ADC12L032CIWM's 2-channel multiplexer and 12-bit-plus-sign resolution support thermocouple, RTD, and 4-20 mA loop readouts with suitable signal conditioning upstream. The integrated sample/hold eliminates the need for external buffer amps, and the on-chip self-calibration maintains INL/DNL accuracy over the -40C to +85C industrial operating range. The MICROWIRE/SPI interface connects directly to industrial PLCs or panel-meter MCUs.
Recommended
Patient Monitoring Sensor Pads
Low-power medical sensing modules targeting portable patient monitoring can use the ADC12L032CIWM to digitize pressure or bioelectric signals. The 3.3 V single-supply operation aligns with medical-grade battery and isolation barrier constraints, and the 12-bit-plus-sign resolution delivers the dynamic range needed for heart-rate or respiration waveforms. The serial interface minimizes MCU pin count in compact wearable form factors.
Recommended
Instrumentation and Panel Meters
Digital panel meters and lab instrumentation benefit from the ADC12L032CIWM's on-chip self-calibration and bipolar-input support. The 12-bit-plus-sign resolution is sufficient for bench DMM ranges up to 0.025% accuracy when paired with precision op-amp front ends and a quality external reference. Designers can implement 2-channel differential measurements for volt/ohm modes on the same converter, reducing BOM count.
Recommended
Remote Environmental Sensor Networks
Wireless environmental sensors require small, low-power ADCs to digitize analog signals before RF transmission. The ADC12L032CIWM in SOIC-20 provides the throughput needed to read temperature, humidity, and gas-sensor analog outputs at scheduled intervals and stream results via an attached wireless MCU. The small footprint and 3.3 V operation suit solar- or battery-powered remote stations.
Recommended
Smart Sensor Conditioning Modules
Industrial smart-sensor conditioner boards use the ADC12L032CIWM to digitize bridge, thermistor, or pH sensor outputs. The pseudo-differential input mode cancels common-mode noise from long sensor cables, while the SPI port streams data to an industrial IoT processor. On-chip self-calibration plus industrial temperature rating make it suitable for harsh factory-floor and outdoor environments.
Recommended
Recommended Products Summary
Engineering reference data for ADC12L032CIWM — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ADC12032CIWM/NOPB | ADC12L030CIWM/NOPB | ADC12H032CIWM |
|---|---|---|---|---|
| Brand | Texas Instruments (NSC acquired) | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 20-SOIC Wide (300 mil, EIAJ) | 20-SOIC Wide (300 mil, EIAJ) - same | 20-SOIC Wide (300 mil, EIAJ) - same | 20-SOIC Wide (300 mil, EIAJ) - same |
| Resolution | 12-bit plus sign | 12-bit plus sign | 12-bit plus sign | 12-bit plus sign |
| Supply Voltage | 3.0 V to 5.5 V | 3.0 V to 5.5 V | 3.0 V to 5.5 V | 3.0 V to 5.5 V |
| Interface | SPI / MICROWIRE | SPI / MICROWIRE | SPI / MICROWIRE | SPI / MICROWIRE |
| Lifecycle Status | Obsolete | Active | Active | Obsolete |
Key Differentiators
- Active-production drop-in replacement available (vs ADC12032CIWM/NOPB)
- Family compatibility for channel-count scaling (vs ADC12L030CIWM/NOPB)
- Higher-throughput sibling (H variant) in same footprint (vs ADC12H032CIWM)
Design Notes
Estimated: at 3.3 V analog supply and 200 kHz SCLK rate, the ADC12L032CIWM draws roughly 5 mA during conversion per the datasheet. Decouple AVDD with a 0.1 uF X7R ceramic placed within 5 mm of the AVDD pin to suppress supply-borne switching noise. DVDD should be tied to AVDD or a separately filtered 3.3 V rail; do not run digital lines under the analog section.
Route the analog input traces as a differential pair with matched length (within 5 mm) and surround them with a guard trace tied to AGND to reject common-mode noise. Place the external decoupling capacitors and reference bypass (10 uF tantalum + 0.1 uF ceramic) as close as physically possible to the VREF pin. Keep digital switching lines (SCLK, CS, DOUT) at least 3 mm away from the analog input traces.
Avoid leaving the MUX select pin floating; it must be driven high or low for the desired channel, otherwise the output code is undefined. Issue a calibration command after every power-up cycle and after temperature swings exceeding 25 C to restore specified INL/DNL accuracy per the datasheet. Do not apply analog voltages exceeding AVDD + 0.3 V or below AGND - 0.3 V to the input pins.
Compliance Information
Original manufacturer was National Semiconductor (NSC), acquired by Texas Instruments. Lifecycle status is obsolete per TI catalog; RoHS/REACH compliance not explicitly listed in the legacy datasheet. AEC-Q100 not applicable for commercial/industrial data-acquisition ICs.
