ADC08032CIWMX - 8-Bit 2-ChHS Serial I/O SAR ADC | Texas Instruments
MPN: ADC08032CIWMX ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.5 | $4.50 |
| 10 | $4.05 | $40.50 |
| 100 | $3.62 | $362.00 |
| 500 | $3.25 | $1,625.00 |
| 1,000 | $2.88 | $2,880.00 |
ADC08032CIWMX Overview
What is an SAR ADC? A successive-approximation-register analog-to-digital converter is a sampling ADC architecture that uses a binary-search algorithm against an internal DAC to determine each bit of the conversion result, one bit per clock pulse. SAR ADCs sit in the data-converter hierarchy between flash converters (fastest, lowest resolution) and sigma-delta converters (highest resolution, lowest speed). They deliver an attractive balance of 8-18 bit resolution, low to moderate sampling rates up to a few MSPS, deterministic latency, and very low power consumption, making them a workhorse for embedded measurement, industrial control, and precision sensor front-ends.
Key features include two differential analog input channels with true-differential track-and-hold, software-configurable unipolar/bipolar input ranges, on-chip track-and-hold, a serial data interface that reduces board-routing complexity versus parallel-output SAR ADCs, and an external-clock SAR architecture that allows conversion rates up to the device's specified sample rate. The ADC08032 family is widely deployed in legacy industrial, instrumentation, and process-control designs.
Typical applications include two-channel data acquisition systems, multi-sensor monitoring with channel scanning, portable/battery-powered measurement equipment, and embedded instrumentation that requires a serial interface to a microcontroller with limited GPIO. The differential input capability makes it suitable for bridge sensors, thermocouples with cold-junction compensation, and ratiometric measurements.
When designing with this device, place 0.1uF decoupling capacitors as close as possible to the AVDD and DVDD pins, ensure the reference voltage source has low output impedance at the conversion-clock frequency, and verify timing margins on SCLK, CS, and DOUT against your microcontroller's SPI-rated peripheral. The serial interface eliminates bus-contention issues common to parallel-output ADCs.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes for engineers working with the legacy ADC08032 family, information not consolidated in the manufacturer datasheet.
Drop-in alternatives for ADC08032CIWMX — 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 ADC08032CIWMX (same form factor and footprint) — differing in Data Interface, Resolution, Operating Temperature, Package, RoHS Status.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ADC08032CIWM/NOPB
✅ Drop-In📋 Reference alternative (not in catalog)
ADC08034CIWM/NOPB
✅ Drop-In📋 Reference alternative (not in catalog)
ADC08038CIWM/NOPB
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
ADC08832IWM/NOPB
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$1.92 / Unit
View Datasheet →ADC08032CIWMX Maximum Ratings & Electrical Characteristics
| Resolution | 8 bit |
| Architecture | SAR (Successive Approximation Register) |
| Number of Input Channels | 2 (differential or single-ended, MUX'd) |
| Analog Supply Voltage | 4.5 V to 5.5 V (typ. +5 V) |
| Data Interface | Serial (3-wire SPI/QSPI/MICROWIRE-compatible) |
| Operating Temperature | -40 C to +85 C (industrial) |
| Package | 14-SOIC (DWM, SOIC-14, 150 mil) |
| Mounting Type | Surface Mount |
| Conversion Clock Source | External |
ADC08032CIWMX Pin Configuration
| Pin 1 | VIN+ — Analog input positive (channel 1) |
| Pin 2 | VIN- — Analog input negative (channel 1) |
| Pin 3 | VREF — External reference voltage input |
| Pin 4 | AGND — Analog ground |
| Pin 5 | IN2+ — Analog input positive (channel 2) |
| Pin 6 | IN2- — Analog input negative (channel 2) |
| Pin 7 | AVDD — Analog supply (+5 V) |
| Pin 8 | DOUT — Serial data output |
| Pin 9 | SCLK — Serial clock input |
| Pin 10 | CS — Chip select (active low) |
| Pin 11 | DVDD — Digital supply |
| Pin 12 | DGND — Digital ground |
| Pin 13 | NC — Not connected (per datasheet) |
| Pin 14 | NC — Not connected (per datasheet) |
Typical Applications
ADC08032CIWMX is suitable for 6 applications: Two-Channel Industrial Data Acquisition, Portable Battery-Powered Measurement, Embedded Microcontroller Sensor Interface, Process Control and Instrumentation, Automotive Sensor Monitoring (Non-Safety), Test and Measurement Front-End.
Two-Channel Industrial Data Acquisition
The ADC08032CIWMX fits two-channel industrial data acquisition because its 2-channel MUX and 8-bit SAR architecture deliver simultaneous dual-sensor monitoring without the FPGA footprint of higher-resolution ADCs. Typical inputs are two 4-20 mA current-loop sensors or two 0-10 V process signals conditioned by op-amp front-ends, with the converter running from a single +5 V analog supply common in industrial PLC backplanes. The 3-wire serial SPI/QSPI/MICROWIRE-compatible interface connects directly to a microcontroller's SPI peripheral, eliminating the bus-contention issues of parallel-output ADCs. The -40 C to +85 C industrial operating range suits factory-floor enclosures, and the SOIC-14 package is compatible with hand-solderable rework for field-service scenarios.
Recommended
Portable Battery-Powered Measurement
The ADC08032CIWMX is suitable for portable battery-powered measurement because its SAR architecture draws power only during active conversion, with low quiescent current between samples extending battery life in handheld multimeters and field data loggers. The serial 3-wire interface frees microcontroller GPIOs for LCD/keypad duties typical of handheld instruments, and the SOIC-14 (DWM) package fits inside compact enclosures. Two input channels support dual-probe measurements such as voltage-plus-current sampling for power-meter applications. Single +5 V analog supply operation aligns with USB-powered or 4xAA battery-stack designs. Designers should add a low-dropout regulator for stable VREF to maximize code stability across battery discharge curves.
Recommended
Embedded Microcontroller Sensor Interface
The ADC08032CIWMX interfaces naturally to microcontrollers with limited GPIO because its 3-wire serial output requires only three pins (CS, SCLK, DOUT) versus 8+ pins for parallel-output 8-bit ADCs - critical for low-pin-count MCUs. Its SPI/QSPI/MICROWIRE compatibility means no glue logic between the converter and common MCU peripherals from TI MSP430, STM32, and PIC families. Two-channel MUX supports scanning two sensors with one ADC, halving board area versus two single-channel ADCs. The 8-bit resolution suits thermal-zone monitoring, light-sensor arrays, and basic strain-gauge bridges where 256 quantization levels provide adequate dynamic range. For designs needing >8 bits the ADC08832IWM/NOPB is a same-footprint upgrade.
Recommended
Process Control and Instrumentation
The ADC08032CIWMX fits process-control analog front-ends because its differential-input MUX accepts bipolar signals typical of industrial transducers, and its single +5 V supply aligns with PLC analog-input module rails. Two channels can scan a temperature-plus-flow-rate pair from a single converter footprint, reducing bill-of-material cost and PCB area in DIN-rail modules. The serial interface simplifies isolation barrier design - only three digital lines need to cross the galvanic isolation, versus eight for parallel-output converters, which reduces optocoupler or digital-isolator channel requirements and lowers isolation-barrier cost. Industrial -40 C to +85 C operation tolerates unheated control cabinets.
Recommended
Automotive Sensor Monitoring (Non-Safety)
The ADC08032CIWMX is appropriate for non-safety automotive sensor monitoring such as cabin-temperature plus humidity sensing, battery-voltage plus accessory-current monitoring, and HVAC damper-position feedback. The 8-bit resolution suits slow-changing analog signals where 256 codes is sufficient and conversion speed is not critical. Two input channels reduce component count versus two single-channel ADCs. Designers should note that for safety-critical applications (airbag, steering, braking) an AEC-Q100-qualified ADC must be selected instead. The standard ADC08032CIWMX is suitable for body-electronics and infotainment analog front-ends where automotive grade is not mandated.
Recommended
Test and Measurement Front-End
The ADC08032CIWMX serves as a low-cost front-end for test-and-measurement bench instruments such as bench-top multimeters, panel meters, and educational lab modules where two channels (voltage plus current) are typical inputs. Its serial output simplifies connection to a host PC through a USB-to-SPI bridge, eliminating the need for a parallel-port controller. The 8-bit SAR architecture provides deterministic conversion latency, important for triggered measurements where timing reproducibility is required. The SOIC-14 (DWM) package is well-suited to through-hole-socketed daughter boards for educational use, and the low unit cost makes it attractive for cost-sensitive multi-channel scanning applications.
Recommended
Recommended Products Summary
Engineering reference data for ADC08032CIWMX — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ADC08032CIWM/NOPB | ADC08034CIWM/NOPB | ADC08832IWM/NOPB |
|---|---|---|---|---|
| Package | SOIC-14 (DWM) | SOIC-14 (DWM) - same | SOIC-14 (DWM) - same | SOIC-14 (IWM) - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Resolution | 8 bit | 8 bit | 8 bit | 8 bit |
| Number of Input Channels | 2 | 2 | 4 | 2 |
| Architecture | SAR | SAR | SAR | SAR (enhanced S/H) |
| Data Interface | Serial (SPI/QSPI/MICROWIRE-compatible) | Serial (SPI/QSPI/MICROWIRE-compatible) | Serial (SPI/QSPI/MICROWIRE-compatible) | Serial (SPI/QSPI/MICROWIRE-compatible) |
| Analog Supply | +5 V single | +5 V single | +5 V single | +5 V single |
| Operating Temperature | -40 C to +85 C (industrial) | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C |
Key Differentiators
- Two-channel MUX in compact 14-SOIC (vs Single-channel 8-bit SAR ADCs)
- Serial interface eliminates parallel-bus contention (vs Parallel-output 8-bit ADCs)
- Legacy family with mature TI/National Semiconductor support (vs Newer 8-bit SAR ADCs)
Design Notes
Place 0.1 uF decoupling capacitors as close as possible to the AVDD and DVDD pins of the ADC08032CIWMX, with a 10 uF bulk capacitor on the analog supply rail within 1 inch of the IC. The ADC08032 is sensitive to analog-supply noise; an LDO or LC filter between the system +5 V rail and AVDD reduces ripple coupling into the conversion result. If the design uses a switching converter for the 5 V supply, add a pi-filter (inductor + capacitor + capacitor) to attenuate switching noise above the SAR's conversion-clock frequency. Reference the datasheet layout guidelines for the AVDD/DVDD grounding strategy.
Route the analog inputs (VIN+, VIN-, IN2+, IN2-) as differential pairs with matched trace lengths and a ground shield, to reject common-mode noise from digital traces on the same PCB layer. Keep the analog input traces away from SCLK, CS, and DOUT digital traces; if the layout forces crossings, route them perpendicular to minimize coupling. Place the external reference capacitor (typically 10 uF) close to the VREF pin. Connect AGND and DGND at a single point under the IC (star-ground topology) to avoid ground-loop noise coupling into the analog section.
The ADC08032's SAR architecture samples the input at the SCLK edges, so jitter on SCLK directly translates to aperture-time jitter and degrades SNR. Drive SCLK from a low-jitter source - microcontroller SPI peripherals are usually adequate but check that the MCU's clock tree does not introduce >50 ns jitter. Add a small RC low-pass filter on SCLK at the ADC pin if the MCU-to-ADC trace is long, to slow the edge and reduce ringing. The CS signal should fall at least one SCLK period before the first data edge to give the SAR internal logic time to stabilize. Verify timing parameters (tCSH, tCSS, tDS) in the datasheet against your MCU's SPI mode.
Common pitfalls when working with the ADC08032CIWMX include: (1) exceeding the absolute-maximum 6.5 V on AVDD - hot-plugging the supply or transients on a 24 V industrial rail can destroy the part; add a TVS diode. (2) Forgetting the external reference decoupling - the ADC08032 requires a stable low-impedance VREF or the conversion result will be noisy. (3) Driving analog inputs beyond the rails or the reference range - clamp with protection diodes if the source can overshoot. (4) Confusing the two input channels - the MUX register must be configured before each conversion to select the right channel. (5) Ignoring the -40 C to +85 C industrial operating range if the design is deployed outside.
Compliance Information
Compliance status was not present in the verified web data; set to unknown per Data Authenticity Rule 1. The part is not AEC-Q100 qualified (this is the standard industrial part, not an automotive grade). Designers needing automotive-grade equivalents should consult TI's automotive SAR ADC portfolio.
