ADC08832IM - 8-Bit SAR ADC, 2-Ch MUX, 8-SOIC | Texas Instruments
MPN: ADC08832IM ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.85 | $2.85 |
| 10 | $2.55 | $25.50 |
| 100 | $2.15 | $215.00 |
| 500 | $1.78 | $890.00 |
| 1,000 | $1.42 | $1,420.00 |
| 3,000 | $1.08 | $3,240.00 |
ADC08832IM Overview
Background: A successive-approximation ADC (SAR ADC) is a sampled-data converter that uses a binary-search charge-redistribution DAC to converge on the input voltage one bit per clock cycle. SAR ADCs are widely chosen when low latency, deterministic throughput, and excellent DC accuracy are required - they sit in the converter hierarchy between flash converters (fastest, lowest resolution) and delta-sigma converters (highest resolution, lower bandwidth). A 2-channel input multiplexer allows a single ADC to digitize two analog sources sequentially, removing the need for two separate converter ICs in cost-sensitive designs.
Key features include a 3-wire serial data link (CS, CLK, DO) that interfaces directly to COPS-family microcontrollers, PLDs, microprocessors, DSPs, and shift registers with no glue logic. The differential/single-ended input range spans from GND to VCC (typically 0 V to 5 V), no external zero or full-scale adjustment is required, and TTL/CMOS-compatible I/O simplifies 5 V and 3.3 V system integration. An on-chip track-and-hold front end captures fast or multiplexed signals without an external buffer.
The architecture uses a capacitive-charge redistribution DAC matched against the input sample, with internal clock generation to control bit-trial timing. Digital readings are clocked out MSB-first through the DO pin, falling synchronously with the input clock transitions supplied to CLK. The internal oscillator is trimmed for the 4 us full-conversion target at fC = 2 MHz, and conversion results are ratiometric to the VREF applied to the MUX inputs - using VCC as the reference therefore yields a transfer curve of 1 LSB = VCC/256.
Typical applications include industrial process-control data acquisition, portable instrumentation, point-of-sale terminals, and embedded sensor interfaces where a small-form-factor 8-bit converter is preferable to a discrete op-amp plus external ADC design. Designers upgrading legacy ADC0831/ADC0832 boards can drop this part into existing footprints for an immediate speed, power, and channel-count upgrade.
When designing with ADC08832IM, follow a few key guidelines: place a 0.1 uF ceramic bypass capacitor within 5 mm of VCC, drive CLK with a clean CMOS clock rather than an RC source to avoid jitter-driven noise, and treat DO as a high-impedance output between conversions if sharing the bus with other peripherals. Optimum performance is achieved with ratiometric input sources (or a low-impedance reference) - the ratiometric topology means that absolute reference tolerance is absorbed into the application accuracy budget.
This page synthesizes distributor stock and pricing, drop-in-compatible same-family alternatives (ADC08831IMX, ADC08831IMM/NOPB from the same datasheet family), and practical design notes that complement - rather than copy - the manufacturer datasheet.
Drop-in alternatives for ADC08832IM — 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 ADC08832IM (same form factor and footprint) — differing in Data Interface, Resolution.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ADC08831IMX
✅ Drop-In✓ In Stock
$0.78 / Unit
View Datasheet →ADC08832IM Maximum Ratings & Electrical Characteristics
| Resolution | 8 bits |
| Architecture | Successive Approximation (SAR) |
| Number of Inputs | 2 (configurable, single-ended/differential) |
| Conversion Time Max | 4 us (fC = 2 MHz) |
| Analog Input Range | GND to VCC |
| Input Type | Single-ended or differential with MUX |
| Sample and Hold | Internal, on-chip |
| Data Interface | 3-wire serial (CS, CLK, DO) - SPI/QSPI/MICROWIRE compatible |
| Clock Frequency Max | 2 MHz (fC) |
| Power Dissipation | 8.5 mW (typical) |
| Digital I/O Logic Levels | TTL/CMOS compatible |
| Operating Temperature Range | -40 C to +85 C |
| Package | 8-SOIC (0.150 inch, SO Wide) |
| Pin Count | 8 |
| Mounting Type | Surface Mount |
| Reference / Transfer Ratio | 1 LSB = VREF/256 (ratiometric to VCC) |
ADC08832IM Pin Configuration
| Pin 1 | CS — Chip Select (active low) |
| Pin 2 | CH0 — Analog Input Channel 0 (MUX Input) |
| Pin 3 | CH1 — Analog Input Channel 1 (MUX Input) |
| Pin 4 | GND — Ground |
| Pin 5 | VREF — Voltage Reference (ratiometric, often tied to VCC) |
| Pin 6 | DO — Serial Data Out (MSB first) |
| Pin 7 | CLK — Serial Clock Input |
| Pin 8 | VCC — +5 V Analog Supply |
Typical Applications
ADC08832IM is suitable for 6 applications: Industrial Process-Control Data Acquisition, Portable Instrumentation and Battery-Powered Meters, Legacy Board Refresh: ADC0831/ADC0832 Replacement, Point-of-Sale Terminals and Barcode Scanners, Embedded Sensor Interfaces for IoT Edge Nodes, Automotive Interior Switch Monitoring.
Industrial Process-Control Data Acquisition
The ADC08832IM's 8-bit resolution and 4 us max conversion at fC=2 MHz (250 kSPS effective throughput) suit slow-loop industrial sensors such as thermocouple conditioning boards, 4-20 mA loop monitors, and PLC analog input modules. The 2-channel MUX directly digitizes two sensor sources (e.g., RTD + cold-junction compensation) without an external analog switch, while GND-to-VCC analog input and ratiometric transfer match bridge-style pressure and strain-gauge front ends. Internal sample-and-hold removes the need for a buffer amplifier on multiplexed signals. Compared with delta-sigma alternatives, the SAR settling is deterministic and predictable, which simplifies IEC 61131-2 EMC compliance testing on the industrial analog front end.
Recommended
Portable Instrumentation and Battery-Powered Meters
The ADC08832IM's 8.5 mW typical dissipation extends battery runtime in handheld DMMs, HVAC service tools, and consumer medical devices such as glucose meters or peak-flow sensors. Single 5 V supply (single-ended GND-to-VCC analog input) lets designers power the part directly from a USB 5 V rail or a boost-converter rail shared with the host microcontroller. The 3-wire SPI/QSPI/MICROWIRE-compatible serial interface uses only three MCU pins, leaving GPIOs free for LCD drive, keypad scan, or BLE module handshaking. Internal sample-and-hold avoids an external amplifier to shrink PCB area - valuable when targeting <50 mm x 30 mm portable enclosures.
Recommended
Legacy Board Refresh: ADC0831/ADC0832 Replacement
TI's datasheet explicitly markets ADC08832IM as a 'superior pin-compatible replacement for ADC0831/2', making it the lowest-risk upgrade for fielded industrial controller, telemetry, or instrumentation PCBs. The 8-SOIC footprint, 3-wire serial protocol, and GND-to-VCC analog input map identically between ADC0832 and ADC08832IM, so firmware drivers written for the legacy part run without code changes. The new part brings a 2:1 speed improvement at the same 2 MHz clock input, an integrated sample-and-hold that the legacy part lacked, and identical transfer function (1 LSB = VREF/256). For retrofits, the key concern is supply current at 5 V - verify the existing regulator has margin for the ADC08832IM's 8.5 mW typical load.
Recommended
Point-of-Sale Terminals and Barcode Scanners
ADC08832IM fits handheld barcode scanner heads and POS keypad subassemblies where two analog channels (such as a photodiode signal and a battery-monitor divider) must be sampled by a single low-pin-count MCU. The 250 kSPS effective throughput exceeds typical POS analog sampling needs (1-10 kSPS per channel) by a comfortable margin, allowing each scanned bar to be read multiple times for ambient-light rejection. GND-to-VCC analog input matches the photodiode transimpedance amplifier output directly, removing the need for level-shifting. The SO-8 wide-body footprint has stable solder-joint reliability under repeated mechanical shock, suitable for handheld retail environments.
Recommended
Embedded Sensor Interfaces for IoT Edge Nodes
The ADC08832IM is well-matched to 8-bit quantization in low-cost wireless sensor nodes (LoRa, Zigbee, BLE) where two analog channels measure e.g., soil moisture + temperature from a single coin-cell-powered MCU. The 8.5 mW active draw fits duty-cycled designs that wake once every few seconds for a short burst of conversions before returning the system to sleep. Single-supply operation lets the part share a 3.3 V/5 V LDO with the radio module. The internal sample-and-hold enables direct connection to high-impedance resistive sensors without a buffer op-amp, reducing BOM by ~$0.30 per node - meaningful at million-unit IoT scale.
Recommended
Automotive Interior Switch Monitoring
While not AEC-Q100 qualified itself, the ADC08832IM is found in aftermarket automotive interior modules (window/sunroof switches, climate-control panels) where two wiper-position or trim-knob analog inputs are read by a single converter. The 2-channel MUX scans both knob positions sequentially in <8 us, letting one ADC replace two single-channel ADCs or a dedicated analog switch. The 8-SOIC wide package and -40 C to +85 C operating range cover cabin-temperature specifications, while the 5 V supply matches the regulated 5 V rail commonly present in automotive body-control modules.
Recommended
Recommended Products Summary
Engineering reference data for ADC08832IM — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ADC08831IMX | ADC08831IMM/NOPB | ADC08832IWM/NOPB |
|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 8-SOIC (0.150 inch) | 8-SOIC (0.150 inch) - same | 8-MSOP (VSSOP) - smaller | 16-SOIC (0.300 inch) - larger |
| Resolution | 8 bits | 8 bits | 8 bits | 8 bits |
| Number of Channels | 2 (MUX) | 1 | 1 | 2 (MUX) |
| Conversion Time Max | 4 us (fC=2 MHz) | 4 us (fC=2 MHz) | 4 us (fC=2 MHz) | 4 us (fC=2 MHz) |
| Power Dissipation | 8.5 mW typical | 8.5 mW typical | 8.5 mW typical | 8.5 mW typical |
| Interface | 3-wire SPI/QSPI/MICROWIRE | 3-wire SPI/QSPI/MICROWIRE | 3-wire SPI/QSPI/MICROWIRE | 3-wire SPI/QSPI/MICROWIRE |
| Operating Temperature | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C |
| Lifecycle Status | NRND | Obsolete | Active | Active |
Key Differentiators
- Integrated 2-channel analog multiplexer (vs ADC0831 / single-channel predecessors)
- Pin-compatible upgrade to legacy ADC0831/ADC0832 (vs TI legacy ADC0831/ADC0832 8-SOIC parts)
- Wide-body SO-8 ensures robust solder joints (vs MSOP-8 alternative packaging)
- Higher throughput at modest power (vs AD7476 / AD7477 10-/12-bit ADC parts)
Design Notes
Place a 0.1 uF ceramic bypass capacitor within 5 mm of the ADC08832IM VCC pin (pin 8) and add a 10 uF bulk tantalum or ceramic capacitor at the regulator output for transient load steps during conversion. The 8.5 mW typical dissipation at 5 V draws ~1.7 mA continuously during conversion; when sequencing the ADC08832 with a low-power MCU, keep the ADC supply rail up before initiating CLK to avoid spurious digital activity on DO.
Route the CLK trace as a 50-ohm controlled-impedance microstrip and keep it at least 2 mm away from the analog MUX input traces to avoid capacitive clock-feedthrough coupling into the input. Place a guard ground via on either side of the analog input pins, and tie AGND (chip GND, pin 4) directly to the analog ground plane rather than to the digital ground return - star-ground the AGND return path to avoid digital return currents flowing under the analog input pins.
The DO pin is a tri-state output that returns to high-impedance when CS is deasserted, so it can be shared on a multi-device SPI bus. Hold CS high between conversions to keep DO high-Z; this prevents bus contention when more than one SAR ADC shares the CLK/MOSI lines. Clock high and low minimum pulse times in the datasheet must be respected - driving CLK faster than 2 MHz forces the SAR comparator into insufficient settling time and degrades INL/DNL.
Do not float the VREF pin - it must be tied to VCC (or a low-impedance external reference) for correct ratiometric conversion; a floating VREF yields mid-scale errors and unstable readings. Likewise, when using single-ended inputs, tie the unused MUX channel to mid-supply (VCC/2) rather than to GND to keep the internal switch charge injection symmetric. Estimated: at 2 MHz clock and 25 C ambient, expect ~3-5 LSB of peak DNL due to internal capacitor mismatch.
Compliance Information
IM suffix historically identifies non-RoHS/lead SOIC variants, while IM/NOPB identifies lead-free/RoHS parts; verify exact finish from TI order code. No AEC-Q100 qualification available for this part per TI lifecycle page.
