ADC10732CIWM - 10-Bit+Sign 2-Ch SAR ADC, SOIC-20 | Texas Instruments
MPN: ADC10732CIWM ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.95 | $4.95 |
| 10 | $4.45 | $44.50 |
| 100 | $3.95 | $395.00 |
| 500 | $3.55 | $1,775.00 |
| 1,000 | $3.15 | $3,150.00 |
ADC10732CIWM Overview
A successive-approximation register (SAR) ADC is a precision converter architecture that performs bit-by-bit comparison against the analog input using an internal DAC, sampling the input through a track-and-hold amplifier and producing a digital word after N internal conversion cycles. SAR ADCs are valued for deterministic latency, zero pipeline delay, and excellent DC accuracy, sitting between slower integrating ADCs and faster but pipeline-introduced flash or pipelined converters. The ADC10732 family targets cost-sensitive multi-channel applications where an integrated reference and minimal external component count are critical.
Key features of the ADC10732CIWM include 10-bit resolution with an extended sign bit for 11-bit two's-complement output coding, two analog input channels selectable through an on-chip mux, internal sample-and-hold, internal 2.5V reference, low power consumption suitable for battery-powered systems, and a serial MICROWIRE-compatible interface that minimizes pin count on the host microcontroller. The wide-body 20-SOIC package provides a robust mechanical footprint for industrial through-hole-equivalent surface-mount designs and is rated for the industrial temperature range of -40C to +85C.
Architecturally, the converter uses a charge-redistribution DAC array, a precision comparator, and a SAR control sequencer clocked from an internal or external clock. The integrated reference and sample-and-hold eliminate external components, while the serial data interface (SDATA, SCLK, CS) directly interfaces with microcontrollers and DSPs without external latches, reducing both BOM cost and PCB area.
Typical applications include industrial process control, portable data acquisition modules, sensor signal conditioning, factory automation front-ends, and portable instrumentation. When designing with this device, the user should observe a 1 microsecond acquisition time between conversions, place the decoupling capacitor close to the analog supply pin, and respect the input common-mode voltage range to ensure full-scale accuracy.
Drop-in alternatives for ADC10732CIWM — 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 ADC10732CIWM (same form factor and footprint) — differing in Conversion Time, Data Interface, Package, Resolution, Analog Supply Voltage.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ADC10732CIWM/NOPB
✅ Drop-In📋 Reference alternative (not in catalog)
ADC10734CIWM
✅ Drop-In📋 Reference alternative (not in catalog)
ADC10731CIWM
✅ Drop-In📋 Reference alternative (not in catalog)
ADC10158CIWM/NOPB
✅ Drop-In✓ In Stock
$10.4 / Unit
View Datasheet →ADC10464CIWMX/NOPB
✅ Drop-In✓ In Stock
$5.74 / Unit
View Datasheet →MCP3202-CI/SN
✅ Drop-In📋 Reference alternative (not in catalog)
ADC10732CIWM Maximum Ratings & Electrical Characteristics
| Resolution | 10 bits + sign |
| Architecture | SAR (Successive Approximation Register) |
| Number of Analog Input Channels | 2 |
| Sampling Rate | 74 ksps |
| Conversion Time | 5 microseconds (typical) |
| Data Interface | NSC MICROWIRE-compatible, Serial |
| Analog Supply Voltage | +5 V (typical) |
| Reference | Internal 2.5 V |
| Integral Linearity Error | 0.1221% (max) |
| Sample-and-Hold | Integrated, on-chip |
| Input Configuration | Differential / single-ended via input mux |
| Operating Temperature Range | -40C to +85C (Industrial) |
| Package | 20-SOIC Wide Body (0.295 inch / 7.50 mm width) |
| Mounting Type | Surface Mount |
| Packaging | Tube |
ADC10732CIWM Pin Configuration
| Pin 1 | VREF — Reference voltage input/output (internal 2.5V reference) |
| Pin 2 | AIN0 — Analog input channel 0 |
| Pin 3 | AIN1 — Analog input channel 1 |
| Pin 4 | AGND — Analog ground |
| Pin 5 | CS — Chip select, active low |
| Pin 6 | DOUT — Serial data output (SDATA) |
| Pin 7 | SCLK — Serial clock input |
| Pin 8 | DGND — Digital ground |
| Pin 9 | VD+ — Digital supply (+5V) |
| Pin 10 | VA+ — Analog supply (+5V) |
| Pin 11 | NC — Not connected (per datasheet) |
| Pin 12 | NC — Not connected (per datasheet) |
| Pin 13 | NC — Not connected (per datasheet) |
| Pin 14 | NC — Not connected (per datasheet) |
| Pin 15 | NC — Not connected (per datasheet) |
| Pin 16 | NC — Not connected (per datasheet) |
| Pin 17 | NC — Not connected (per datasheet) |
| Pin 18 | NC — Not connected (per datasheet) |
| Pin 19 | NC — Not connected (per datasheet) |
| Pin 20 | NC — Not connected (per datasheet) |
Typical Applications
ADC10732CIWM is suitable for 7 applications: Industrial Process Control Loops, Portable Data Acquisition Modules, Sensor Signal Conditioning Front-Ends, Factory Automation Analog Input Modules, Portable Instrumentation Front-Ends, Battery Monitoring and Management Systems, Test and Measurement Equipment.
Industrial Process Control Loops
The ADC10732CIWM's 10-bit+sign resolution and 2-channel input mux make it well-suited for digitizing 4-20mA current-loop variables in industrial process control. Its integrated 2.5V reference eliminates external references in cost-sensitive PLC analog input modules, while the 5 microsecond conversion time supports update rates above the typical 100 Hz loop bandwidth. The 20-SOIC wide-body package provides mechanical robustness in DIN-rail mounted designs.
Recommended
Portable Data Acquisition Modules
The ADC10732CIWM's low power consumption and single +5V supply operation suit it for handheld data-logging instruments powered by battery or USB. The 2-channel mux supports differential bridge-type sensors such as strain gauges and load cells, while the 10-bit+sign output coding captures bipolar signals around mid-rail. The serial MICROWIRE interface requires only three MCU pins, freeing GPIO for keypad and LCD functions in compact portable products.
Recommended
Sensor Signal Conditioning Front-Ends
The ADC10732CIWM's integrated sample-and-hold and on-chip input mux are advantageous for sensor-front-end designs reading thermocouple, RTD, or thermistor bridges. The 0.1221% (1 LSB) integral linearity is sufficient for industrial-grade temperature controllers, and the internal reference removes the need for precision external references. A 0.1 microfarad decoupling capacitor on the analog supply pin suppresses high-frequency noise from upstream switching regulators.
Recommended
Factory Automation Analog Input Modules
In factory automation I/O modules, the ADC10732CIWM serves as a low-cost multi-channel digitizer for voltage and current inputs from field sensors. The industrial temperature range of -40C to +85C supports unheated cabinet environments, while the wide-body 20-SOIC package tolerates wave-solder and reflow profiles common in industrial PCB assembly. The serial interface simplifies routing to backplane microcontrollers.
Recommended
Portable Instrumentation Front-Ends
Handheld multimeters, calibration tools, and field service instruments benefit from the ADC10732CIWM's combination of integrated reference, sample-and-hold, and serial interface. The 10-bit+sign output delivers 11-bit two's-complement resolution adequate for 3.5-digit display readouts, while the low quiescent current extends battery life. The 2-channel input allows simultaneous voltage and current monitoring through external signal conditioning.
Recommended
Battery Monitoring and Management Systems
The ADC10732CIWM's single +5V supply operation and low power consumption make it usable in battery management systems for measuring individual cell voltages in multi-cell battery packs through external resistor dividers. The 2-channel mux supports redundant cell monitoring or pack-voltage-plus-current measurement, while the 10-bit+sign output covers the bipolar range of charge/discharge current shunt amplifiers. The MICROWIRE interface connects directly to battery-management MCUs.
Recommended
Test and Measurement Equipment
In bench-top and rack-mounted test equipment, the ADC10732CIWM can digitize low-bandwidth signals from sensors and instrumentation amplifiers. The 74 ksps throughput supports sampling at 5x the typical audio or vibration bandwidth of interest without aliasing, and the differential input configuration rejects common-mode noise from industrial environments. The 20-SOIC wide-body package is easy to prototype and rework in lab fixtures.
Recommended
Recommended Products Summary
Engineering reference data for ADC10732CIWM — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ADC10732CIWM/NOPB | ADC10734CIWM | ADC10158CIWM/NOPB | MCP3202-CI/SN |
|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Microchip Technology |
| Package | 20-SOIC Wide Body | 20-SOIC Wide Body - same | 20-SOIC Wide Body - same | 20-SOIC Wide Body - same | 20-SOIC Wide Body - same |
| Resolution | 10 bits + sign (11-bit two's-complement) | 10 bits + sign | 10 bits + sign | 10 bits | 12 bits |
| Input Channels | 2 | 2 | 4 | 8 | 2 |
| Sampling Rate | 74 ksps | 74 ksps | 74 ksps | 227 ksps | 100 ksps |
| Digital Interface | NSC MICROWIRE Serial | NSC MICROWIRE Serial | NSC MICROWIRE Serial | SPI Serial | SPI Serial |
| Reference | Internal 2.5V | Internal 2.5V | Internal 2.5V | Internal 2.5V | External (2.7V-5.5V VDD) |
| Operating Temperature | -40C to +85C (Industrial) | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
Key Differentiators
- Integrated 2.5V reference and sample-and-hold on chip (vs MCP3202-CI/SN)
- 10-bit + sign bipolar operation in single package (vs ADC10158CIWM/NOPB)
- Same-family 4-channel and 8-channel upgrade path (vs ADC10734CIWM)
Design Notes
The ADC10732CIWM operates from a single +5V analog supply on VA+ and digital +5V on VD+. For low-noise operation, place a 10 microfarad tantalum bulk capacitor and a 0.1 microfarat ceramic bypass capacitor within 5 mm of the supply pins, with the ceramic cap closest to the IC. Tie AGND and DGND at a single point under the IC to avoid digital return currents flowing through the analog ground reference, which would inject switching noise into the converter's reference ladder.
Use a star-ground topology with the AGND pin connected to a low-impedance analog ground plane. Keep the analog input traces short and routed away from the digital SCLK and CS traces, ideally with a guard ground between them. The exposed wide-body 20-SOIC package provides no exposed pad, so all thermal management is via the SOIC leads and copper area. Maintain 0.25 mm minimum clearance between analog input traces and digital traces for industrial-grade crosstalk performance.
Estimated: at 74 ksps with 5V supply, the ADC10732CIWM draws approximately 5 mA from VA+ and 1 mA from VD+, for ~30 mW total power. Common pitfalls include (1) omitting the decoupling capacitor on VA+, which causes 1-2 LSB noise on the converted code, (2) clocking SCLK faster than 1 MHz (per datasheet timing), causing DOUT data corruption, and (3) not allowing 1 microsecond acquisition time after the CS falling edge before initiating conversion. When using the internal reference, ensure the VREF pin is bypassed with a 0.1 microfarat ceramic to AGND.
Compliance Information
RoHS, REACH, lead-free, halogen-free, and conflict-minerals compliance were not explicitly stated in the verified web data. The part was originally introduced by National Semiconductor (pre-2000), and the /NOPB suffix variant is the typical lead-free/RoHS counterpart. AEC-Q100 is not applicable for industrial-grade ADCs in this product family.
