ADC08831IMX - 8-Bit Serial ADC 1-Ch 8-SOIC | Texas Instruments
MPN: ADC08831IMX ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.85 | $1.85 |
| 10 | $1.62 | $16.20 |
| 100 | $1.34 | $134.00 |
| 500 | $1.12 | $560.00 |
| 1,000 | $0.94 | $940.00 |
| 2,500 | $0.78 | $1,950.00 |
ADC08831IMX Overview
A SAR ADC is a type of data converter that performs a binary search through an internal resistor-ladder DAC to determine each digital code in a single conversion cycle; the architecture offers a deterministic latency and a strong trade-off between speed, power consumption, and cost for low-to-medium resolution measurements. Within the broader data-converter hierarchy, the ADC08831 sits below pipelined ADCs (used above ~10 MSPS) and above integrating ADCs (used for high-resolution DC measurements), occupying the 8-10-bit / 100-500 ksps niche where low cost and a small serial interface are dominant design constraints.
Key features of the ADC08831IMX include 8-bit resolution with no missing codes, 1 input channel via the 2:1 input MUX, 3-wire MICROWIRE-compatible serial interface (CS, SCLK, DOUT), an internal sample-and-hold amplifier, and an industrial temperature range of -40 C to +85 C. The converter is fabricated on a low-power CMOS process, and the SOIC-8 surface-mount package is the same JEDEC-standard land pattern used across thousands of 8-pin analog ICs.
Typical applications include portable and battery-powered instrumentation, digital panel meters, isolated sensor front-ends, and embedded MCU-based measurement systems where a 3-wire serial port pins out without an external address/data bus. The internal input MUX allows two single-ended sensors to share one converter, reducing BOM cost and PCB area.
When designing with this part, observe the 4.5 V to 6.5 V supply constraint and the 181 ksps maximum throughput; at higher clock rates the aperture timing becomes critical, and the internal reference/VDD ratio should be considered against system noise. The serial interface is read-only (no SDI on the base ADC08831 variant), simplifying the protocol at the cost of register programming flexibility.
This page synthesizes distributor pricing, drop-in alternatives, application circuits, and design notes drawn from TI's datasheet and the XAIPART internal database, providing information gain beyond what the manufacturer datasheet alone delivers.
Drop-in alternatives for ADC08831IMX — 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 ADC08831IMX (same form factor and footprint) — differing in Data Interface, Package, RoHS Status, Input Type, Number of Input Channels.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ADC08831IM/NOPB
✅ Drop-In📋 Reference alternative (not in catalog)
ADC08831IMX/NOPB
✅ Drop-In📋 Reference alternative (not in catalog)
ADC08832IWM/NOPB
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$1.92 / Unit
View Datasheet →ADC08831IMX Maximum Ratings & Electrical Characteristics
| Manufacturer | Texas Instruments |
| Part Number | ADC08831IMX |
| Resolution | 8 bit |
| Number of Input Channels | 1 (2:1 MUX on chip) |
| Converter Architecture | SAR (Successive Approximation Register) |
| Sampling Rate (Max) | 181 kSPS |
| Data Interface | MICROWIRE-compatible 3-wire serial (CS, SCLK, DOUT) |
| Analog Supply Voltage | 4.5 V to 6.5 V |
| Digital Supply Voltage | 4.5 V to 6.5 V |
| Input Voltage Range | 0 V to VCC (with internal input clamps) |
| Package / Case | 8-SOIC (0.154 in / 3.90 mm width) |
| Mounting Type | Surface Mount |
| Operating Temperature | -40 C to +85 C |
| Sample-and-Hold | On-chip |
| MSL Level | 1 (per JEDEC J-STD-020) |
| RoHS Status | Compliant |
ADC08831IMX Pin Configuration
| Pin 1 | VCC — Analog and digital supply voltage (4.5 V to 6.5 V) |
| Pin 2 | CH0 — Analog input channel 0 (single-ended, internal MUX input) |
| Pin 3 | CH1 — Analog input channel 1 (single-ended, internal MUX input) |
| Pin 4 | AGND — Analog ground |
| Pin 5 | DGND — Digital ground |
| Pin 6 | DOUT — Serial data output (3-wire MICROWIRE interface) |
| Pin 7 | SCLK — Serial clock input (3-wire MICROWIRE interface) |
| Pin 8 | CS — Chip select (active low, 3-wire MICROWIRE interface) |
Typical Applications
ADC08831IMX is suitable for 6 applications: Digital Panel Meter, Portable Battery-Powered Sensor Reader, Industrial Process Control Front-End, Isolated Sensor Digitization, Embedded MCU-Based Measurement Module, Automotive Body Electronics Sensor Interface.
Digital Panel Meter
The ADC08831IMX is well-suited for digital panel meter designs that digitize a 0-5 V or 4-20 mA-derived voltage and display it on a 7-segment or LCD readout. The 8-bit resolution (256 codes, ~19.5 mV per LSB at 5 V full-scale) is more than adequate for panel-meter accuracy, and the 181 kSPS sampling rate is far above what is needed for human-readable updates. The 2:1 internal MUX allows a single ADC to read both the main signal and a reference/calibration input. The 3-wire serial interface connects to almost any MCU without bus contention, simplifying the BOM and firmware.
Recommended
Portable Battery-Powered Sensor Reader
Battery-powered and portable sensor readers benefit from the ADC08831IMX's low quiescent current and simple 3-wire serial interface. The 8-bit resolution is sufficient for temperature, humidity, and basic pressure sensors where absolute accuracy below 1% is not required. The internal 2:1 MUX lets the MCU switch between two sensor inputs without an external switch IC, reducing BOM cost and PCB area. The 5 V supply range suits 4-cell AA or single-cell Li-ion with boost converter designs. Power-down modes available through the CS pin further extend battery life in duty-cycled measurement applications.
Recommended
Industrial Process Control Front-End
Industrial 4-20 mA loop receivers and process-control front-ends frequently use the ADC08831IMX to digitize a current-sense voltage and pass the digital value to a controller. The 4.5 V to 6.5 V supply range matches the 5 V industrial rail, and the -40 C to +85 C operating temperature covers harsh factory environments. The 181 kSPS sampling rate supports control loop bandwidths well above typical 10 Hz process-control loops. The MICROWIRE-compatible 3-wire interface allows connection to legacy industrial MCUs and DSPs that do not expose a full SPI peripheral.
Recommended
Isolated Sensor Digitization
The ADC08831IMX is well-suited for isolated sensor front-ends where the analog signal is converted to digital on the sensor side of an isolation barrier. The serial interface (CS, SCLK, DOUT) requires only 3 digital lines, allowing them to be routed through 3-channel digital isolators (such as ISO7640) for high common-mode rejection. The 8-bit resolution is sufficient for many sensor types including strain gauges, thermocouples (with cold-junction compensation), and pressure transducers. The single 5 V supply simplifies the isolated side power design.
Recommended
Embedded MCU-Based Measurement Module
The ADC08831IMX is a common companion to small 8-bit and 16-bit MCUs in cost-sensitive embedded modules where 8-bit resolution is sufficient. The 3-wire MICROWIRE interface is supported by virtually every MCU with a synchronous serial port, including MSP430, PIC16/18, AVR, and basic STM8 families. The 8-SOIC package is hand-solderable and breadboard-friendly, making the part a frequent choice for hobbyist and educational platforms. The 181 kSPS sampling rate supports audio-bandwidth measurement (up to ~80 kHz) and oversampling techniques to improve effective resolution.
Recommended
Automotive Body Electronics Sensor Interface
The ADC08831IMX can be used in non-safety-critical automotive body electronics such as seat position sensors, ambient light sensors, and interior temperature sensors. The 8-bit resolution is appropriate for these applications where 1% accuracy is not required. The 5 V supply range aligns with the automotive 12 V bus regulated down to 5 V. The -40 C to +85 C operating temperature covers most passenger-compartment requirements, though under-hood applications would need a wider-temp part. The compact 8-SOIC package fits easily into space-constrained body-electronics modules.
Recommended
Recommended Products Summary
Engineering reference data for ADC08831IMX — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ADC08831IM/NOPB | ADC08831IMX/NOPB |
|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 8-SOIC (0.154 in, 3.90 mm) | 8-SOIC (0.154 in, 3.90 mm) - same | 8-SOIC (0.154 in, 3.90 mm) - same |
| Resolution | 8 bit | 8 bit - same | 8 bit - same |
| Sampling Rate | 181 kSPS | 181 kSPS - same | 181 kSPS - same |
| Supply Voltage | 4.5 V to 6.5 V | 4.5 V to 6.5 V - same | 4.5 V to 6.5 V - same |
| Input Channels | 1 (2:1 internal MUX) | 1 (2:1 internal MUX) - same | 1 (2:1 internal MUX) - same |
| Serial Interface | 3-wire MICROWIRE | 3-wire MICROWIRE - same | 3-wire MICROWIRE - same |
| Operating Temperature | -40 C to +85 C | -40 C to +85 C - same | -40 C to +85 C - same |
| Packaging Format | Tape & Reel (IMX suffix) | Tube (IM suffix) | Tape & Reel, Pb-free NOPB |
Key Differentiators
- Integrated 2:1 input multiplexer in a small 8-SOIC package (vs Single-channel 8-bit ADCs without internal MUX)
- 5 V supply range with industrial -40 C to +85 C temperature grade (vs 3.3 V-only 8-bit ADCs)
- MICROWIRE-compatible 3-wire serial interface (vs Parallel-output 8-bit ADCs)
Design Notes
Estimated: at 181 kSPS and 5 V supply, the ADC08831 typically draws 1-2 mA from VCC. Place a 10 uF bulk capacitor and a 0.1 uF ceramic bypass capacitor as close as possible to the VCC pin to suppress digital switching noise from corrupting the analog conversion. AGND and DGND should be tied at a single point near the IC to avoid ground-loop errors. If the digital supply is derived from a separate regulator, add a ferrite bead in series to provide additional high-frequency isolation.
Do not connect the analog inputs (CH0, CH1) below ground or above VCC; the internal input clamping diodes forward-conduct and can damage the part or inject current into the signal source. If the input can exceed these rails, add external series resistance (1 kohm to 10 kohm) to limit the fault current. The CS pin should not be left floating - always drive it from the host MCU to prevent spurious clock edges from advancing the internal state machine and corrupting conversions.
Keep analog input traces short and routed away from the digital SCLK and DOUT lines. Use a ground plane under the ADC and route digital signals on the opposite side of the board, or use a split-plane technique with the analog ground plane placed directly under the ADC. The MICROWIRE serial bus runs at speeds up to several MHz, so add a 33 ohm series resistor at the SCLK source to dampen reflections if the bus length exceeds 50 mm. Place a 100 ohm resistor at the DOUT pin if driving long cables.
For best noise performance, drive the analog inputs with a low-impedance source (<= 1 kohm) and add a 100 pF to 1 nF capacitor at each analog input pin to filter RF interference. The 8-bit resolution means the LSB size at 5 V full-scale is 19.5 mV, so a 1 mV RMS noise is well below 1 LSB. If higher accuracy is needed, average multiple conversions in firmware or oversample by sampling faster than the Nyquist rate of the input signal. The internal sample-and-hold has an acquisition time that limits the maximum input frequency to about 80 kHz at full-scale.
Compliance Information
RoHS compliant per TI product page. The IMX suffix denotes tape-and-reel packaging; the IM/NOPB variant is the Pb-free NOPB version. AEC-Q100 qualification is not applicable for this part - not designed for automotive safety-critical applications. For AEC-Q100-qualified 8-bit ADCs, consider the TI Automotive portfolio.
