ADC12H038CIWMX - 12-Bit+Sign SAR ADC 8-Channel 28-SOIC | TI
MPN: ADC12H038CIWMX ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $11.5 | $11.50 |
| 10 | $10.2 | $102.00 |
| 100 | $8.85 | $885.00 |
| 500 | $7.5 | $3,750.00 |
| 1,000 | $6.75 | $6,750.00 |
ADC12H038CIWMX Overview
An SAR (successive-approximation register) ADC is one of the primary categories of analog-to-digital converters, alongside Delta-Sigma, pipeline, and dual-slope architectures. SAR ADCs use a binary-search algorithm against an internal DAC, providing deterministic latency, low power consumption, and excellent behavior for multiplexed multi-channel data-acquisition systems. ADC12H038CIWMX belongs to the data-acquisition IC family and is positioned between simple 8-bit SARs and 16-bit+ precision converters, offering an excellent balance for medium-resolution multi-channel sensing.
Key features include eight input channels routed through an internal analog multiplexer, built-in self-calibration (offset and gain) that the device performs automatically, a sample/hold front end that captures fast signals, and a serial data output that minimizes pin count. The part operates from -40 C to +85 C industrial temperature range and is offered in a 28-SOIC (7.50 mm body width) for robust through-hole-style hand soldering and inspection.
Technically, the device combines a charge-redistribution DAC with auto-zeroing and self-calibration logic that periodically trims offset and linearity errors, maintaining accuracy across the 4.5 V to 5.5 V supply range. The serial interface (DI, DO, CS, CLK) follows the NSC MICROWIRE/QSPI-compatible protocol, allowing direct connection to most microcontrollers and DSPs without glue logic.
Typical applications include multi-channel industrial sensor monitoring, portable instrumentation, process-control front ends, and medical monitoring equipment. The wide temperature range and self-calibration make it well-suited for factories, remote data loggers, and battery-powered measurement devices.
When designing with this ADC, ensure the analog and digital supplies share a clean ground return and add 100 nF decoupling close to AVDD/DVDD pins. Calibration runs automatically on power-up; allow at least 100 ms before valid conversions are issued after supply stabilization.
This page aggregates pricing tiers, drop-in pin-compatible alternatives in the same 28-SOIC footprint, and practical design notes not found in the manufacturer datasheet. All values are referenced from DigiKey, Mouser, and the TI/National Semiconductor datasheet family.
Drop-in alternatives for ADC12H038CIWMX — 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 ADC12H038CIWMX (same form factor and footprint) — differing in Input Type, Data Interface, Package, Architecture, Operating Temperature.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ADC12038CIWM/NOPB
✅ Drop-In✓ In Stock
$9.4 / Unit
View Datasheet →ADC12038CIWMX
✅ Drop-In📋 Reference alternative (not in catalog)
ADC12030CIWM/NOPB
✅ Drop-In📋 Reference alternative (not in catalog)
ADC12032CIWM/NOPB
✅ Drop-In✓ In Stock
$4.75 / Unit
View Datasheet →ADC12L038CIWM/NOPB
✅ Drop-In📋 Reference alternative (not in catalog)
ADC10738CIWMX
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$5.48 / Unit
View Datasheet →ADC10158CIWMX/NOPB
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$5.74 / Unit
View Datasheet →ADC12H038CIWMX Maximum Ratings & Electrical Characteristics
| Resolution | 12 bit + sign (13-bit dynamic range) |
| Number of Input Channels | 8 single-ended / 4 pseudo-differential |
| Architecture | SAR (Successive Approximation) |
| Sample/Hold | Integrated |
| Analog Supply Voltage | 4.5 V to 5.5 V |
| Digital Supply Voltage | 4.5 V to 5.5 V |
| Data Interface | NSC MICROWIRE-compatible serial (SPI/QSPI) |
| Sampling Rate | Up to 73.7 kS/s (typical) |
| Self-Calibration | Yes (offset and gain, auto on power-up) |
| Input Voltage Range | 0 V to VREF (unipolar); ±VREF (with sign bit) |
| Reference Voltage | External (typically 2.5 V or 5 V) |
| Operating Temperature | -40 C to +85 C |
| Package | 28-SOIC (DW), 7.50 mm body width |
| Mounting Type | Surface Mount |
| MSL Level | 1 (unlimited) |
| RoHS Status | Compliant (lead-free SOIC variant) |
| Input Type | Single-ended, pseudo-differential, or differential (sign bit) |
ADC12H038CIWMX Pin Configuration
| Pin 1 | VREF+ — Positive reference voltage input |
| Pin 2 | VREF- — Reference ground / negative reference |
| Pin 3 | AGND — Analog ground |
| Pin 4 | AVDD — Analog supply (4.5 V to 5.5 V) |
| Pin 5 | DVDD — Digital supply (4.5 V to 5.5 V) |
| Pin 6 | DGND — Digital ground |
| Pin 7 | CAL — Calibration pin (active low) |
| Pin 8 | SCLK — Serial clock input (MICROWIRE) |
| Pin 9 | DI — Serial data input to ADC |
| Pin 10 | DO — Serial data output from ADC |
| Pin 11 | CS — Chip select (active low) |
| Pin 12 | EOC — End-of-conversion output (active low) |
| Pin 13 | PD — Power-down input (active high) |
| Pin 14 | MUXOUT0 — Mux output bit 0 (channel select) |
| Pin 15 | MUXOUT1 — Mux output bit 1 (channel select) |
| Pin 16 | MUXOUT2 — Mux output bit 2 (channel select) |
| Pin 17 | CH0 — Analog input channel 0 |
| Pin 18 | CH1 — Analog input channel 1 |
| Pin 19 | CH2 — Analog input channel 2 |
| Pin 20 | CH3 — Analog input channel 3 |
| Pin 21 | CH4 — Analog input channel 4 |
| Pin 22 | CH5 — Analog input channel 5 |
| Pin 23 | CH6 — Analog input channel 6 |
| Pin 24 | CH7 — Analog input channel 7 |
| Pin 25 | VIN+ — Positive analog input (pseudo-differential) |
| Pin 26 | VIN- — Negative analog input (pseudo-differential) |
| Pin 27 | NC — Not connected (per datasheet) |
| Pin 28 | NC — Not connected (per datasheet) |
Typical Applications
ADC12H038CIWMX is suitable for 6 applications: Multi-Channel Industrial Sensor Monitoring, Portable Battery-Powered Data Loggers, Process Control Front-End (PLC), Medical Patient Monitoring Equipment, Automotive Sensor Interface Modules, Test & Measurement Instrumentation.
Multi-Channel Industrial Sensor Monitoring
The ADC12H038CIWMX's 8-channel input multiplexer, 12-bit+sign resolution, and built-in self-calibration make it well-suited for factory-floor multi-sensor panels that read thermocouples, pressure transducers, and 4-20 mA loop signals sequentially. The MICROWIRE-compatible serial interface connects directly to most 5 V industrial microcontrollers without glue logic, and the SAR architecture delivers deterministic per-channel conversion latency - critical for synchronous control loops. Combined with the -40 C to +85 C industrial temperature range, the part handles harsh factory environments without performance drift. Power dissipation is modest because conversion only occurs on the active channel.
Recommended
Portable Battery-Powered Data Loggers
Battery-powered data loggers benefit from the ADC12H038CIWMX's low duty-cycle operation and 4.5 V-5.5 V supply that pairs with a single Li-ion cell via boost converter. The self-calibration on power-up eliminates periodic field recalibration, and the SAR architecture only consumes power during active conversions - ideal for sleep/wake cycle designs where the MCU reads sensors every few seconds. The integrated sample/hold captures fast transient signals such as shock or vibration from MEMS accelerometers. The serial MICROWIRE interface allows a single MCU pin to wake the ADC only when needed, extending battery life.
Recommended
Process Control Front-End (PLC)
The ADC12H038CIWMX provides 12-bit+sign resolution and 8 channels in a 28-SOIC package that fits standard PLC analog input modules. Its pseudo-differential input mode supports 4-20 mA loop receivers with proper scaling, and the SAR architecture delivers the deterministic latency required for closed-loop control at fixed cycle times (typically 10-100 ms per channel scan). The self-calibration feature trims offset/gain errors that accumulate in field-installed modules, while the MICROWIRE-compatible interface links to industrial microcontrollers with deterministic timing. This part also meets the -40 C to +85 C industrial grade essential for PLC rack modules.
Recommended
Medical Patient Monitoring Equipment
Medical equipment such as multi-parameter patient monitors and bedside data acquisition units benefit from the ADC12H038CIWMX's 12-bit+sign resolution and built-in self-calibration that ensures measurement accuracy across the device lifetime. The 8-channel MUX sequentially digitizes ECG leads, SpO2 signals, temperature probes, and respiration transducers through a single ADC, reducing board space and BOM cost. The wide operating temperature range supports hospital and ambulatory environments, while the SAR architecture provides stable conversion rates crucial for synchronized multi-channel waveform capture.
Recommended
Automotive Sensor Interface Modules
The ADC12H038CIWMX serves automotive body and chassis sensor interface modules reading multiple 0-5 V analog inputs such as throttle position, fluid levels, and temperature sensors through a single MUX-ed ADC. Its industrial temperature rating (-40 C to +85 C) covers most cabin and underhood sensor locations, though for AEC-Q100 automotive qualification consider TI's automotive-grade SAR ADC family instead. The MICROWIRE-compatible interface easily connects to 5 V automotive microcontrollers like the TMS470 family. The self-calibration runs on every power-up, ensuring consistent readings across cold-crank and load-dump events.
Recommended
Test & Measurement Instrumentation
Bench-top multi-meters, data acquisition systems, and laboratory instruments benefit from the ADC12H038CIWMX's 12-bit+sign resolution and flexible single-ended/pseudo-differential input modes that support various transducer outputs. The 28-SOIC package suits hand-assembled prototype instrumentation, and the SAR architecture provides the deterministic conversion latency needed for triggered sampling in scope-like instruments. Self-calibration reduces drift in long-term unattended installations, while the MICROWIRE-compatible serial interface allows FPGA-based acquisition engines to read channels via SPI.
Recommended
Recommended Products Summary
Engineering reference data for ADC12H038CIWMX — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ADC12038CIWM/NOPB | ADC12038CIWMX | ADC12030CIWM/NOPB | ADC12032CIWM/NOPB | ADC12L038CIWM/NOPB |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 28-SOIC (DW) | 28-SOIC (DW) - same | 28-SOIC (DW) - same | 28-SOIC (DW) - same | 28-SOIC (DW) - same | 28-SOIC (DW) - same |
| Resolution | 12 bit + sign | 12 bit + sign | 12 bit + sign | 12 bit (no sign) | 12 bit (no sign) | 12 bit + sign |
| Number of Input Channels | 8 / 4 pseudo-diff | 8 / 4 pseudo-diff | 8 / 4 pseudo-diff | Single (1) | 2 / 1 pseudo-diff | 8 / 4 pseudo-diff |
| Supply Voltage | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 2.7 V to 3.6 V (3 V variant) |
| Data Interface | MICROWIRE serial | MICROWIRE serial | MICROWIRE serial | MICROWIRE serial | MICROWIRE serial | MICROWIRE serial |
| Self-Calibration | Yes | Yes | Yes | Yes | Yes | Yes |
| Lifecycle Status | NRND | Active | NRND | NRND | NRND | Active |
Key Differentiators
- Built-in 8-channel analog multiplexer with self-calibration (vs Discrete ADC + external MUX designs)
- 12-bit plus sign bit for bipolar inputs without external conditioning (vs Standard 12-bit SAR ADCs (e.g., ADC0808 family))
- Pin-compatible 28-SOIC footprint shared with ADC12038 family (vs ADC10738CIWMX (10-bit variant in same package))
Design Notes
Decouple AVDD and DVDD with separate 100 nF X7R ceramic capacitors placed as close as possible to the respective pins, with a 10 uF bulk tantalum or ceramic on each rail. Use a star-ground topology tying AGND and DGND at a single point beneath the IC to avoid digital switching currents polluting the analog reference ground. The 4.5 V to 5.5 V supply range tolerates typical LDO outputs (e.g., LM7805) without requiring precise regulation.
Route the analog input traces (CH0-CH7, VIN+/VIN-) as a guard-bus pattern, keeping them away from digital SCLK/DI/DO/CS traces. Add a ground fill on both sides of the analog input layers. The MICROWIRE-compatible serial interface runs at modest clock rates; use series resistors (33 ohm) on SCLK and DO if long PCB traces are present to suppress ringing on rising edges.
Do not skip the VREF decoupling: place a 100 nF ceramic directly between VREF+ and VREF-, plus a 10 uF bulk capacitor. Self-calibration runs automatically on power-up - allow at least 100 ms after supply stabilization before reading the first valid conversion, otherwise the first few samples may be invalid. Driving CS low without a valid SCLK sequence can leave the part in an undefined state; always reset by toggling CS high-then-low before initiating a conversion sequence.
Compliance Information
RoHS compliant per TI 28-SOIC lead-free part marking. Not AEC-Q100 qualified (industrial grade, -40C to +85C). Halogen-free status was not stated in verified data; treat as unknown. Conflict-minerals compliant per TI standard policy.
