ADC08831IWM/NOPB - 8-Bit SAR ADC, 1-Ch, MICROWIRE I/F | TI
料号： ADC08831IWM/NOPB ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $2.41 | $2.41 |
| 10 | $2.12 | $21.20 |
| 100 | $1.79 | $179.00 |
| 500 | $1.55 | $775.00 |
| 1,000 | $1.39 | $1,390.00 |
ADC08831IWM/NOPB 概述
A SAR ADC (successive-approximation-register analog-to-digital converter) is a type of data converter that uses a binary-search algorithm and an internal capacitive DAC to digitize an analog input in N clock cycles for N bits of resolution. SAR ADCs sit in the broader data-converter hierarchy between flash converters (faster but expensive) and sigma-delta converters (higher resolution but slower); they are valued for deterministic latency, moderate speed at low-to-moderate resolution, and low power consumption without external precision components.
Key features of the ADC08831 include 181 kSPS maximum sample rate, a single analog input channel with integrated multiplexer tie-off options for differential operation, an on-chip sample-and-hold front end, and a National MICROWIRE-compatible serial interface that shares bus timing with SPI and TI MSP430 peripherals. The 14-SOIC wide-body package provides robust thermal performance for through-hole-compatible PCB footprints and remains compatible with industry-standard hand-soldering and automated SMT lines.
Operationally, the part performs an internal conversion in approximately 8 I/O clock periods and uses an external reference voltage (typically tied to the analog supply for true ratiometric operation). The architecture is built on a CMOS process that minimizes active current draw while preserving low input-leakage performance, simplifying analog front-end design in embedded systems. According to TI product page for ADC08831, this device is intended for systems that need predictable, mid-resolution analog-to-digital conversion without the BOM cost of a precision op-amp front end.
Typical applications for the ADC08831IWM/NOPB include digital panel meters, portable instrumentation, white-goods and appliance user-interface boards, simple process-control analog front ends (4-20 mA loop monitors), 8-bit MCU sensor acquisition channels (e.g., to PIC, 8051, or MSP430 cores), and battery-cell monitoring accessories. The wide SOIC package suits hand-soldered prototypes, educational kits, and low-volume industrial legacy retrofits where a true ratiometric 8-bit reference channel is acceptable.
When designing with this device, place a 0.1 uF decoupling capacitor as close as possible to the analog supply pin and keep the analog input traces short and guarded by a ground pour to minimize digital coupling. The MICROWIRE interface shares lines with the system microcontroller's SPI peripheral, so designers should verify CPOL/CPHA mode matching and consider an external pull-up on the chip-select line if the host bus is released between transactions.
This page synthesizes distributor stock and pricing, parametric same-package drop-in alternatives, and practical design notes that complement the TI ADC08831 datasheet.
直接替换替代料： ADC08831IWM/NOPB ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： ADC08831IWM/NOPB （相同外形与封装尺寸） ——差异在于 Sampling Rate, Data Interface, Input Type, Package, RoHS Status.
快速对比工具——选择替代料号进行并排对比：
ADC08832IWM/NOPB
✅ 直接替换✓ 有现货
$1.92 / 个
查看数据手册 →ADC08831IMM/NOPB
✅ 直接替换✓ 有现货
$0.95 / 个
查看数据手册 →ADC08831IMX/NOPB
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
ADC0831CCWM
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$2.65 / 个
查看数据手册 →ADC0844CCN/NOPB
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$6.05 / 个
查看数据手册 →ADC0838CCN/NOPB
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$3.21 / 个
查看数据手册 →ADC08831IWM/NOPB 最大额定值与电气特性
| Number of Bits | 8 |
| 采样率 | 181 kSPS (max) |
| Number of Input Channels | 1 |
| Architecture | SAR (Successive Approximation) |
| Input Type | Single-Ended (with MUX) / Pseudo-Differential |
| Data Interface | NSC MICROWIRE / SPI-compatible (Serial) |
| Number of Converters | 1 |
| Configuration | MUX + S/H (Sample-and-Hold integrated) |
| Reference Type | External (typically tied to VCC for ratiometric) |
| Digital Supply Voltage | 4.5 V to 5.5 V (typically shared with analog VCC) |
| 工作温度范围 | -40C to +85C (Industrial) |
| 封装 / 外壳 | 14-SOIC (0.295 inch, 7.50 mm width), wide-body |
| 安装类型 | Surface Mount |
| Packaging | Tube |
| Terminal Form | GULL WING |
| Temperature Grade | INDUSTRIAL |
| RoHS 状态 | Compliant (NOPB suffix = No-Lead, lead-free finish) |
ADC08831IWM/NOPB 引脚配置
| 引脚 1 | VIN+ — Analog input (non-inverting / single-ended positive input) |
| 引脚 2 | VIN- — Analog input (inverting input; tied to GND for single-ended) |
| 引脚 3 | VREF — External reference voltage input |
| 引脚 4 | AGND — Analog ground |
| 引脚 5 | GND — Digital / chip ground |
| 引脚 6 | VCC — +5 V analog/digital supply |
| 引脚 7 | CS — Chip select (active low) for MICROWIRE interface |
| 引脚 8 | CLK — Serial clock input (MICROWIRE/SPI) |
| 引脚 9 | DI — Serial data input (control word to ADC) |
| 引脚 10 | DO — Serial data output (conversion result from ADC) |
| 引脚 11 | NC — Not connected |
| 引脚 12 | NC — Not connected |
| 引脚 13 | NC — Not connected |
| 引脚 14 | NC — Not connected |
典型应用
ADC08831IWM/NOPB 适用于 7 应用s: Digital Panel Meters and Front-Panel Displays, Portable / Handheld Instrumentation, White Goods and Appliance User-Interface Boards, 4-20 mA Loop Monitors and Industrial Process Inputs, Embedded MCU Sensor Acquisition (8-bit PIC / 8051 / MSP430 Front-End), Battery-Cell Monitoring and Simple Energy-Management Add-Ons, Educational Kits and Training/Demo Boards.
Digital Panel Meters and Front-Panel Displays
The ADC08831IWM/NOPB is well-matched to digital panel-meter and front-panel display designs where the converter drives a 3.5-digit LCD or LED readout from a 0-5 V analog signal. Its 8-bit resolution yields 256 discrete steps - sufficient for one-decimal-place readout accuracy - and the 181 kSPS throughput means an entire panel refresh completes in microseconds with low latency. The wide-body SOIC-14 package exposes the analog pinout for clean PCB routing; place a 0.1 uF decoupling cap adjacent to VCC and route the reference (often tied to VCC for ratiometric readout) through a short trace to minimize digital-coupling noise.
推荐
Portable / Handheld Instrumentation
For battery-powered DMMs, temperature loggers, and field-service instruments, the ADC08831IWM/NOPB's CMOS SAR architecture draws active current only during conversion and is otherwise static, extending battery life when sample-rate duty cycles are low. The chip-select line enables software gating of conversions, while the external reference lets designers select a low-drift shunt reference (e.g., TL431) for measurement accuracy despite battery droop. The 14-SOIC wide-body footprint survives hand-solder rework during prototype bring-up - useful for low-volume portable products.
推荐
White Goods and Appliance User-Interface Boards
In washing-machine, dishwasher, oven, and HVAC control boards, the ADC08831IWM/NOPB digitizes analog signals from potentiometers, NTC thermistors, and pressure sensors that feed the appliance's main MCU. The 181 kSPS speed handles a few hundred sensor channels per refresh cycle comfortably, and the SOIC-14 footprint mates with industry-standard appliance-grade PCB assemblies. Ratiometric measurement against VCC makes sensor calibration straightforward across production tolerances.
推荐
4-20 mA Loop Monitors and Industrial Process Inputs
Industrial process-control front ends often rely on the ADC08831IWM/NOPB to convert a current-loop-derived voltage into a digital value for a supervisor PLC or sensor transmitter. Combined with a 250 ohm loop-sense resistor and a 1.2 V shunt reference, the converter provides a reliable 8-bit readout over the 4-20 mA range with integral signal-conditioning simplicity. The wide SOIC-14 package eases optical-isolation PCB layouts where the ADC sits on the field side.
推荐
Embedded MCU Sensor Acquisition (8-bit PIC / 8051 / MSP430 Front-End)
The ADC08831IWM/NOPB is a classic 8-bit SAR peripheral for vintage PIC, 8051, and MSP430-based boards that lack an integrated ADC or whose internal converters are saturated. The MICROWIRE-compatible SPI interface shares lines with standard MCU peripherals, letting a single CS pin select the ADC while CLK, DO, and DI run from the same bus. The 14-SOIC wide-body package suits through-hole-compatible upgrade boards in industrial controller retrofits.
推荐
Battery-Cell Monitoring and Simple Energy-Management Add-Ons
Add-on battery-management boards for e-bikes, portable lighting, and small UPS units can use the ADC08831IWM/NOPB to digitize pack voltage and a single temperature sensor, providing an 8-bit reading over the typical 6-36 V battery range when paired with a resistor divider. The converter's 5 V supply operation aligns with single-cell Li-ion or 6 V lead-acid system rails through simple LDOs. The 181 kSPS sample rate ensures transient overvoltage detection on each scan cycle.
推荐
Educational Kits and Training/Demo Boards
University MCU labs and vendor training kits frequently feature the ADC08831IWM/NOPB as a teachable SAR ADC example because of its simple MICROWIRE interface, single-5 V supply, and SOIC-14 wide-body footprint that is friendly to breadboard adapters and hand-solder rework. The 8-bit resolution is ideal for illustrating quantization theory, Nyquist sampling, and ratiometric sensing without the noise-floor ambiguity of higher-resolution converters. Students can probe CS, CLK, and DO directly with a logic analyzer.
推荐
推荐产品汇总
工程参考数据： ADC08831IWM/NOPB ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | ADC08832IWM/NOPB | ADC08831IMM/NOPB | ADC08831IMX/NOPB | ADC0831CCWM | ADC0844CCN/NOPB |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 14-SOIC wide-body (7.50 mm) | 14-SOIC wide-body (7.50 mm) - same | 14-SOIC wide-body (7.50 mm) - same | 14-SOIC wide-body (7.50 mm) - same | 14-SOIC wide-body (7.50 mm) - same | 14-SOIC wide-body (7.50 mm) - same |
| Resolution | 8 bits | 8 bits | 8 bits | 8 bits | 8 bits | 8 bits |
| Architecture | SAR | SAR | SAR | SAR | SAR | SAR |
| Sampling Rate (max) | 181 kSPS | 181 kSPS | 181 kSPS | 181 kSPS | ~30 kSPS (lower-speed legacy part) | ~40 kSPS |
| Number of Input Channels | 1 | 1 | 1 | 1 | 1 | 4 |
| Data Interface | MICROWIRE / SPI-compatible (Serial) | MICROWIRE / SPI-compatible | MICROWIRE / SPI-compatible | MICROWIRE / SPI-compatible | MICROWIRE / SPI-compatible | MICROWIRE / SPI-compatible |
| Operating Temperature Range | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | 0C to +70C (commercial) / -40C to +85C variant exists | -40C to +85C |
关键差异点
- Highest sample rate in the SOIC-14 wide-body 8-bit SAR family （对比 ADC0831CCWM)
- Single-channel SAR with simple MICROWIRE bus （对比 ADC0844CCN/NOPB)
- Wide-body SOIC-14 for robust assembly （对比 ADC0831 (8-pin variants))
设计说明
Power-supply decoupling is critical for SAR ADC accuracy. Place a 0.1 uF ceramic capacitor as close as possible to the VCC pin (SOIC-14 pin 6) and add a 10 uF bulk tantalum or ceramic at the analog supply entry to the board. Star-route the analog supply from the regulator output separately from digital logic supplies; sharing the digital rail injects switching transients into the SAR comparator and degrades effective resolution. Estimated: with 1 mA active current and 100 mV allowable rail sag, the local 0.1 uF cap holds ~100 us of supply droop - sufficient for 8-bit conversion integrity at 181 kSPS.
Route analog input traces (VIN+, VIN-, VREF) over a continuous ground pour and keep them short and parallel to minimize loop area and digital crosstalk. Keep the digital MICROWIRE traces (CS, CLK, DI, DO) grouped together but on the opposite side of the analog ground split to avoid capacitive coupling into the analog front end. A guard trace tied to AGND around the VIN+/VIN- pins reduces leakage from adjacent noisy signals.
Common pitfalls when using the ADC08831 include: (1) failing to verify CPOL/CPHA mode in the host MCU's SPI peripheral, which causes the device to ignore the control word; (2) leaving CS floating between conversions, which can deselect the part mid-frame - add a pull-up on CS; (3) tying VREF directly to noisy VCC instead of a buffered reference when measurements must be calibrated across production; (4) exceeding the absolute-maximum analog input range (VREF + 0.3 V at the pins); (5) driving CLK above the datasheet limit during bench testing - 181 kSPS performance assumes the rated clock frequency and timing budgets.
For reliable 181 kSPS operation, the host MCU must drive CLK with signal-integrity that meets the datasheet's setup-and-hold times around CS. Insert a small series resistor (22-33 ohm) at the CLK driver if reflections are visible on a scope, and avoid long stubs to the ADC. Buffer the DO line if more than one MICROWIRE device shares the bus, as the SAR output stage is not intended for heavy bus loading.
合规信息
RoHS compliant indicated by NOPB (No-Lead) suffix in the orderable part number. AEC-Q100 not applicable - this is an industrial-grade part, not an automotive-qualified converter. Halogen-free status not explicitly stated in the verified web data (set to 'unknown' rather than fabricated).
