ADC0832CIWM/NOPB - 8-Bit Serial 2-Ch SAR ADC, 14-SOIC | Texas Instruments
MPN: ADC0832CIWM/NOPB ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.5 | $4.50 |
| 10 | $3.95 | $39.50 |
| 100 | $3.42 | $342.00 |
| 500 | $2.95 | $1,475.00 |
| 1,000 | $2.55 | $2,550.00 |
ADC0832CIWM/NOPB Overview
What is an SAR ADC? A successive-approximation-register analog-to-digital converter is a type of ADC that converts an analog input to a digital code using a binary-search algorithm driven by an internal DAC and comparator. SAR ADCs occupy a niche between high-speed flash and high-resolution delta-sigma converters: they deliver mid-range resolution (8 to 18 bits) at moderate speeds (tens of ksps to several Msps) with low latency and a small, deterministic acquisition window, making them well suited for multiplexed data-acquisition, instrumentation, and embedded control. The ADC0832 family sits at the lowest-resolution end of this hierarchy, where engineers choose it specifically for cost-sensitive or legacy-compatible designs rather than precision.
Key electrical features include 8-bit resolution, two analog input channels selected via the dedicated MUXOUT/MUXIN pins in daisy-chain configurations, a serial data interface compatible with the NSC MICROWIRE protocol, and an operating temperature range of -40 °C to +85 °C (industrial grade). The wide-body 14-SOIC package simplifies hand prototyping and breadboarding while still supporting automated surface-mount assembly. The 'NOPB' suffix denotes a lead-free, RoHS-compliant finish.
The ADC0832CIWM/NOPB uses a charge-redistribution capacitive DAC at the core of its SAR loop, with an internal sample-and-hold capturing the input at the start of each conversion. The two analog inputs share a common ground reference, so any common-mode noise present on both channels will be rejected by the differential input structure when used in pseudo-differential mode. The single-supply requirement reduces system complexity compared to ±15 V designs, although the absolute input range remains tightly bounded.
Typical applications include portable battery-powered instrumentation, legacy sensor-interface boards, industrial process-control front ends, automotive telemetry nodes (non-safety), and embedded data-acquisition modules communicating with a microcontroller through SPI-like serial ports. The part is widely used in educational lab kits and in replacement designs where the original manufacturer-supplied SAR ADC has been discontinued.
When designing with this device, engineers should observe the datasheet's decoupling guidance (a 0.1 µF bypass close to the supply pin) and confirm that the host microcontroller's SPI mode and clock polarity match the ADC0832's MICROWIRE timing. Input signals exceeding VDD + 0.3 V or below -0.3 V will forward-bias the input ESD diodes and may damage the part.
This page combines distributor pricing, drop-in compatible alternatives, and practical design notes not always included on stock cross-reference sites.
Drop-in alternatives for ADC0832CIWM/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 ADC0832CIWM/NOPB (same form factor and footprint) — differing in Data Interface, Operating Temperature, Package, RoHS Status, Sample-and-Hold.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ADC0832CIWM
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
ADC0832CCWM/NOPB
✅ Drop-In📋 Reference alternative (not in catalog)
ADC08832IWM/NOPB
✅ Drop-In✓ In Stock
$1.92 / Unit
View Datasheet →ADC0832CIWM/NOPB Maximum Ratings & Electrical Characteristics
| Resolution | 8 bits |
| Number of Input Channels | 2 |
| Architecture | SAR (Successive Approximation) |
| Sampling Rate | 31 kSPS (typical) |
| Data Interface | NSC MICROWIRE / SPI-compatible serial |
| Package | 14-SOIC (0.295 in / 7.50 mm width) |
| Number of Pins | 14 |
| Input Type | Single-ended / pseudo-differential (configurable) |
| Operating Temperature | -40 °C to +85 °C (industrial) |
| Sample-and-Hold | Internal |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant (NOPB suffix) |
| Lead-Free Finish | Yes (NOPB designation) |
| Package Code | SOP, 14-pin, Gull-Wing |
| Temperature Grade | Industrial |
ADC0832CIWM/NOPB Pin Configuration
| Pin 1 | CS — Chip Select (active low); enables serial interface and starts conversion |
| Pin 2 | CLK — Serial clock input from microcontroller |
| Pin 3 | DI — Serial data input; MUX configuration loaded on this pin |
| Pin 4 | DO — Serial data output; conversion result clocked out on this pin |
| Pin 5 | GND — Ground (analog and digital grounds tied together at pin) |
| Pin 6 | VIN1+ — Analog input channel 1, positive input |
| Pin 7 | VIN1- — Analog input channel 1, negative input (pseudo-differential reference) |
| Pin 8 | VIN2+ — Analog input channel 2, positive input |
| Pin 9 | VIN2- — Analog input channel 2, negative input (pseudo-differential reference) |
| Pin 10 | GND — Ground |
| Pin 11 | VREF — Voltage reference input; defines ADC full-scale range |
| Pin 12 | VDD — Positive supply voltage |
| Pin 13 | NC — Not connected (per datasheet pinout) |
| Pin 14 | NC — Not connected (per datasheet pinout) |
Typical Applications
ADC0832CIWM/NOPB is suitable for 6 applications: Portable Battery-Powered Sensor Interface, Industrial Process-Control Front End, Educational Lab Instrumentation, Embedded Data-Acquisition Modules, Hobby and Maker Microcontroller Shields, Legacy Replacement / Drop-In Board Refresh.
Portable Battery-Powered Sensor Interface
The ADC0832CIWM/NOPB fits portable battery-powered sensor interface designs because it offers single-supply operation and a shutdown mode driven through the CS pin, minimising quiescent current between conversions. Its 8-bit resolution is adequate for thermistor, photocell and similar low-bandwidth analogue sensors, while the MICROWIRE-compatible serial interface attaches directly to a low-pin-count microcontroller without external glue logic. At roughly 31 ksps the converter captures slowly varying signals without aliasing, and the 14-SOIC wide-body footprint supports both hand-prototype and high-volume surface-mount assembly, making it a strong fit for handheld meters and remote sensor nodes where board real estate and battery life dominate the design trade-offs.
Recommended
Industrial Process-Control Front End
The ADC0832CIWM/NOPB is well matched to industrial process-control front ends that read a small number of 4-20 mA conditioned transducer signals and send the digitised result to a PLC or microcontroller. Its 8-bit resolution gives ~0.4 % full-scale granularity, more than sufficient for status monitoring, switch-position read-back, and alarm thresholds but not for precision control loops. The pseudo-differential input mode rejects common-mode noise from long cable runs in factory environments, while the -40 °C to +85 °C industrial temperature grade meets typical cabinet specifications. Designers typically add a TVS diode and a current-sense resistor on each analogue input line so the converter survives the harshest factory transients.
Recommended
Educational Lab Instrumentation
The ADC0832CIWM/NOPB is widely used in educational laboratory instrumentation because the 14-SOIC wide-body package is easy to hand-solder and breadboard, while the MICROWIRE-compatible serial interface teaches the fundamentals of synchronous serial ADC communication without high clock-rate complexity. At 8-bit resolution students can immediately visualise quantisation, linearity and sampling effects on signals from function generators or sensors connected to the lab bench. The part's broad distributor availability and modest price point keep lab kits affordable, and the same evaluation pattern scales later to higher-resolution SAR and delta-sigma converters as students progress through curricula.
Recommended
Embedded Data-Acquisition Modules
The ADC0832CIWM/NOPB serves embedded data-acquisition modules that funnel a handful of analogue channels into a microcontroller's SPI bus at modest conversion rates. The 31 ksps throughput is well matched to multiplexed thermocouple or strain-gauge bridges where thermal settling time dominates; using the internal sample-and-hold plus the pseudo-differential input removes the need for an external instrumentation amplifier on simple transducers. The wide 14-SOIC package simplifies thermal management in sealed enclosures, and the NOPB lead-free finish matches modern RoHS assembly requirements for OEM modules shipping into regulated markets.
Recommended
Hobby and Maker Microcontroller Shields
The ADC0832CIWM/NOPB suits hobby and maker microcontroller shields that need an external ADC when the host MCU lacks an integrated analogue front end or has only 10-bit ADCs and the design needs a quick, low-cost precision boost. At roughly $2.55 in 1000-piece quantities the part is approachable for kit designers, and its serial interface attaches directly to the SPI peripheral of Arduino-class or MSP430-class devices. The 14-SOIC wide-body package is forgiving for hand-soldering in open-source hardware builds, and the two channels cover potentiometer, joystick and battery-monitoring inputs typical of interactive maker projects.
Recommended
Legacy Replacement / Drop-In Board Refresh
The ADC0832CIWM/NOPB is commonly specified as a pin-compatible replacement on legacy boards whose original SAR ADC has been discontinued or allocated to other product lines. The 14-SOIC wide-body footprint matches older NSC and TI ADC083x designs, allowing boards to be refreshed without PCB rework, and the MICROWIRE-compatible serial interface preserves the existing firmware driver layer. For designs needing higher accuracy, modern successors in the same SOIC-14 wide-body family offer drop-in upgrades. The NOPB finish also migrates older lead-bearing assemblies to RoHS-compliant production lines without layout changes.
Recommended
Recommended Products Summary
Engineering reference data for ADC0832CIWM/NOPB — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ADC0832CIWM | ADC0832CCWM/NOPB | ADC08832IWM/NOPB | ADC081S051CISDX/NOPB |
|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 14-SOIC (0.295 in wide-body) | 14-SOIC (0.295 in wide-body) - same | 14-SOIC (0.295 in wide-body) - same | 14-SOIC (0.295 in wide-body) - same | SOIC-8 - different footprint |
| Resolution | 8 bits | 8 bits | 8 bits | 8 bits | 8 bits |
| Number of Input Channels | 2 | 2 | 2 | 8 | 1 |
| Sampling Rate | 31 kSPS | 31 kSPS | 31 kSPS | ~31 kSPS | 500 kSPS |
| Architecture | SAR | SAR | SAR | SAR | SAR |
| Serial Interface | MICROWIRE / SPI-compatible | MICROWIRE / SPI-compatible | MICROWIRE / SPI-compatible | MICROWIRE / SPI-compatible | SPI |
| Operating Temperature | -40 C to +85 C (Industrial) | -40 C to +85 C | 0 C to +70 C (Commercial) | -40 C to +85 C | -40 C to +85 C |
| RoHS / Lead-Free | Yes (NOPB) | Non-RoHS (legacy) | Yes (NOPB) | Yes (NOPB) | Yes (NOPB) |
Key Differentiators
- Drop-in compatible within the ADC083x family in the SOIC-14 wide-body footprint (vs ADC0832CCWM/NOPB)
- Two-channel multiplexer in the same SOIC-14 footprint as single-channel modern competitors (vs ADC081S051CISDX/NOPB)
- Field-proven MICROWIRE-compatible serial interface (vs ADC08832IWM/NOPB)
Design Notes
Estimated: add a 0.1 µF ceramic bypass capacitor within 5 mm of the VDD pin, and a 10 µF bulk capacitor at the regulator output. The ADC0832 family draws short current pulses during conversion; without bulk decoupling the VDD rail can droop and introduce gain or linearity errors on the second channel in a multiplexed sweep. Tie the analog and digital grounds together at a single, low-impedance point near the IC, not at the connector.
Route the CLK and DO traces away from noisy switching nodes (e.g. inductors, relays) and guard them with ground traces if they must cross noisy signal paths. According to standard SAR ADC layout practice documented in TI application notes, keep the analog input traces short and matched, and place the external VREF decoupling capacitor as close to the VREF pin as possible. A ground pour on the analog layer, stitched with multiple vias, reduces the loop area for return currents.
Three recurring mistakes when designing with the ADC0832 are: (1) leaving CS floating during reset, which can cause spurious conversions; (2) driving inputs above VREF or below GND even momentarily - the datasheet absolute-maximum ratings call out excursions of only ±0.3 V; and (3) wrong SPI mode - the ADC0832 expects data to be clocked on one specific edge, so mismatching CPOL/CPHA in the microcontroller driver produces all-zero or all-one readings. Always validate timing on a logic analyser before debugging the analogue front end.
Estimated: for pseudo-differential mode place a common-mode RC filter (typically 10 kΩ + 1 nF) on the negative input to attenuate high-frequency common-mode noise from industrial cable runs. The 8-bit quantisation step at 5 V VREF is ~19.5 mV, so any noise above this threshold shows up as code flicker. Keep switching-frequency harmonics out of the input band by anti-aliasing with a simple first-order RC pole above the highest signal frequency of interest.
Compliance Information
RoHS compliance and lead-free finish are confirmed by the NOPB suffix per TI part-number convention. Other compliance fields (REACH, halogen-free, conflict minerals) were not present in the Verified Web Data; refer to the manufacturer's material declaration for authoritative status.
