ADC08832IMMX/NOPB - 8-Bit 2-Ch 153kS/s SAR ADC | Texas Instruments
MPN： ADC08832IMMX/NOPB ✓ 啟用中ADC08832IMMX/NOPB 概覽
A successive approximation ADC is a converter architecture that uses a binary search algorithm and an internal sample-and-hold to digitize an analog input in a fixed number of clock cycles. Within the data-converter hierarchy, an SAR ADC sits below pipelined and flash converters in raw sample rate but above delta-sigma in latency and DC accuracy per cycle. The 2-channel analog input multiplexer makes this part a compact solution for sensors, instrumentation, and embedded microcontrollers requiring a few channels of precision monitoring rather than a full multi-channel data-acquisition front end.
Key differentiating features include the configurable 2-channel analog multiplexer, single 5V supply operation, TTL/CMOS-compatible I/O, 3-wire MICROWIRE-compatible serial interface, and a low-power mode that drops quiescent dissipation to 3 mW typical. The SAR architecture provides zero-latency conversions, making it well suited to multiplexed sensor acquisition where deterministic timing matters.
From an architecture standpoint, the device uses a charge-redistribution DAC array controlled by successive-approximation logic. Conversion time at the maximum internal clock (fC = 2 MHz) is 4 µs maximum per the datasheet. The serial interface is pin-compatible with the legacy ADC0831/ADC0832 family, allowing straightforward upgrade paths in legacy designs that need only 2 input channels rather than the original single-channel topology.
Typical applications include portable instrumentation, handheld battery-powered meters, microcontroller sensor front ends, factory automation modules, and embedded data loggers. The low-power mode and 5V single-supply operation align well with USB, automotive 5V rails, and battery-derived systems.
When designing with this ADC, ensure the analog inputs stay within the input range of 0V to VREF and that VREF is stable - any noise on VREF directly couples to conversion accuracy. The CS/SS, CLK, and DO serial signals must be kept short to avoid digital coupling into the analog inputs.
This page synthesizes distributor pricing, pin-compatible alternatives within the TI ADC08831/32 family, and practical design notes that are not consolidated in the manufacturer datasheet.
直接替換替代品，適用於 ADC08832IMMX/NOPB — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： ADC08832IMMX/NOPB （相同外形與佔位） — 差異在於 Data Interface, Operating Temperature, Package, RoHS Status, Sampling Rate.
ADC08832IMM/NOPB
✅ 直接替換📋 參考替代品（不在目錄中）
ADC08831IMMX
✅ 直接替換📋 參考替代品（不在目錄中）
ADC08831IMM/NOPB
✅ 直接替換聯絡詢價
查看資料表 →ADC08832IWM/NOPB
✅ 直接替換聯絡詢價
查看資料表 →ADC081S051CISDX/NOPB
✅ 直接替換聯絡詢價
查看資料表 →ADC081S051CISD
✅ 直接替換聯絡詢價
查看資料表 →ADC08832IMMX/NOPB 最大額定值與電氣特性
| Number of Bits | 8 |
| 取樣率 | 153 kS/s |
| Number of Input Channels | 2 |
| Converter Type | SAR (Successive Approximation) |
| Data Interface | MICROWIRE, 3-Wire Serial |
| 封裝 / 外殼 | 8-VSSOP, 8-MSOP (3.00 mm width) |
| 供應電壓 | 4.5 V to 5.5 V (single 5 V supply) |
| Power Dissipation (Active, Typ) | 8.5 mW |
| Power Dissipation (Low-Power Mode, Typ) | 3.0 mW |
| Conversion Time (fC = 2 MHz, Max) | 4 µs |
| Total Unadjusted Error | ±1 LSB |
| Missing Codes | None (over temperature) |
| I/O Logic Compatibility | TTL/CMOS |
| Pin Compatibility | Pin-compatible with ADC0831/ADC0832 |
| 工作溫度 | -40C to +85C (industrial) |
| RoHS 狀態 | Compliant (NOPB suffix) |
| 安裝類型 | Surface Mount |
ADC08832IMMX/NOPB 腳位配置
| 腳位 1 | CH0/CH1 (MUX Select) — Analog input channel select for MUX (or Channel 1 input on ADC08831) |
| 腳位 2 | V+ — Analog supply input (4.5V to 5.5V, 5V nominal) |
| 腳位 3 | VREF — Voltage reference input (sets full-scale range, <= V+) |
| 腳位 4 | GND — Analog and digital ground |
| 腳位 5 | DO — Serial data output (ADC to host) |
| 腳位 6 | CLK — Serial clock input (host to ADC) |
| 腳位 7 | CS/SS — Chip select / slave select (active low) |
| 腳位 8 | VIN+ — Positive analog input (single-ended) |
典型應用
ADC08832IMMX/NOPB 適用於 6 應用s: Portable Handheld Multimeter Data Acquisition, Battery-Operated Sensor Logger, Industrial PLC Analog Input Module, Automotive 5V Sensor Interface, Embedded Microcontroller Sensor Front End, Process Control Loop Monitor.
Portable Handheld Multimeter Data Acquisition
The ADC08832IMMX/NOPB suits handheld multimeters thanks to its 2-channel analog input multiplexer, 5V single supply, and 3.0 mW low-power mode. Both voltage and current sense inputs can be sampled through the MUX without an external analog switch. The 153 kS/s rate provides comfortable headroom for displaying measurements faster than the human eye can perceive updates. The serial MICROWIRE interface consumes only 3 MCU pins, leaving GPIOs free for the rotary switch, LCD, and buzzer functions typical in handheld DMM designs.
推薦
Battery-Operated Sensor Logger
Battery-powered sensor loggers pair naturally with the ADC08832IMMX/NOPB because the part draws only 3.0 mW in low-power mode and operates from a single 5V rail that can be derived from a boost converter or rechargeable Li-Ion via an LDO. Its 2-channel input multiplexer reads both a primary analog sensor (e.g., temperature via RTD bridge) and a battery monitor channel. The SAR architecture guarantees zero-latency conversions on demand, so the MCU can power-cycle the ADC between samples to extend operating life.
推薦
Industrial PLC Analog Input Module
Factory automation PLC analog modules often require a few 8-bit analog inputs per card. The ADC08832IMMX/NOPB provides 2 differential-mappable channels at 153 kS/s, with 8.5 mW active dissipation that simplifies thermal design in enclosed DIN-rail modules. Its industrial -40C to +85C operating range and TTL/CMOS-compatible digital I/O ensure noise-immunity in electrically harsh cabinet environments. A single MICROWIRE bus can host multiple ADC08832 parts with distinct CS lines for higher channel counts.
推薦
Automotive 5V Sensor Interface
Automotive 5V sensor interfaces benefit from the ADC08832IMMX/NOPB's wide industrial temperature range, TTL/CMOS I/O noise tolerance, and 5V single-supply compatibility with vehicle 12V-rail-derived rails. Two channels are useful for paired sensors such as throttle position plus pedal position, or dual-axis potentiometer feedback. The ±1 LSB total unadjusted error gives sufficient resolution for 8-bit reporting at 1% accuracy typical of body-domain automotive sensors.
推薦
Embedded Microcontroller Sensor Front End
Generic microcontroller sensor front ends commonly use the ADC08832IMMX/NOPB as an external companion ADC because its 3-wire MICROWIRE interface maps directly to SPI or USART peripherals with bit-banging capability. The 2-channel multiplexer lets one ADC serve two sensors - for example a thermistor and a photodiode - reducing BOM cost and PCB area. The 8-bit resolution is adequate for thresholds such as temperature trip points and light-level indicators used in consumer IoT.
推薦
Process Control Loop Monitor
Process control loop monitoring requires monitoring a process variable against a setpoint, often with redundancy. The ADC08832IMMX/NOPB provides two analog inputs that can digitize a primary 4-20 mA current loop transmitter output and a redundant secondary loop. Its 153 kS/s rate is more than enough for slow process control loops (sub-Hz bandwidth after decimation). The industrial temperature rating and TTL/CMOS I/O tolerance help it survive electrically noisy plant environments where 24V DC supplies are common.
推薦
推薦產品摘要
工程參考資料，適用於 ADC08832IMMX/NOPB — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | ADC08832IMM/NOPB | ADC08831IMMX | ADC08831IMM/NOPB | ADC08832IWM/NOPB | ADC081S051CISDX/NOPB | ADC081S051CISD |
|---|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 8-VSSOP (MSOP-8, 3.00 mm) | 8-VSSOP (MSOP-8, 3.00 mm) - same | 8-VSSOP (MSOP-8, 3.00 mm) - same | 8-VSSOP (MSOP-8, 3.00 mm) - same | 8-SOIC (3.90 mm) - different PCB footprint | 8-VSSOP (MSOP-8, 3.00 mm) - same | 8-VSSOP (MSOP-8, 3.00 mm) - same |
| Resolution | 8 bit | 8 bit | 8 bit | 8 bit | 8 bit | 8 bit | 8 bit |
| Sampling Rate | 153 kS/s | 153 kS/s | 153 kS/s | 153 kS/s | 153 kS/s | ~500 kS/s (+227%) | ~500 kS/s (+227%) |
| Input Channels | 2 (with MUX) | 2 (with MUX) | 1 (-50%) | 1 (-50%) | 2 (with MUX) | 1 (-50%) | 1 (-50%) |
| Interface Protocol | MICROWIRE / 3-wire serial | MICROWIRE / 3-wire serial | MICROWIRE / 3-wire serial | MICROWIRE / 3-wire serial | MICROWIRE / 3-wire serial | SPI (true SPI mode 0) | SPI (true SPI mode 0) |
| Supply Voltage | 4.5V to 5.5V (5V nom) | 4.5V to 5.5V (5V nom) | 4.5V to 5.5V (5V nom) | 4.5V to 5.5V (5V nom) | 4.5V to 5.5V (5V nom) | 2.7V to 5.25V (wider, lower) | 2.7V to 5.25V (wider, lower) |
| Active Power Dissipation (Typ) | 8.5 mW | 8.5 mW | 8.5 mW | 8.5 mW | 8.5 mW | ~3.6 mW at 3V (lower) | ~3.6 mW at 3V (lower) |
| Operating Temperature | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
| Pin Compatibility vs ADC0831/32 Legacy | Pin-compatible upgrade | Pin-compatible upgrade | Single channel, not direct mux upgrade | Single channel, not direct mux upgrade | Pin-compatible upgrade (SOIC body) | Different pinout - SPI not MICROWIRE | Different pinout - SPI not MICROWIRE |
主要差異化特點
- 2-channel analog input multiplexer integrated on the die (對比ADC08831IMMX)
- Pin-compatible upgrade for legacy ADC0831/ADC0832 designs (對比ADC0832)
- Lower power dissipation in low-power mode vs SPI ADC alternatives (對比ADC081S051CISDX/NOPB)
設計說明
The ADC08832IMMX/NOPB operates from a single 5V supply and draws 8.5 mW typical in active mode, 3.0 mW in low-power mode. Power the analog V+ pin from a clean LDO output (e.g., an LP2985 or equivalent) rather than directly from a switching regulator; ripple on V+ couples into VREF and degrades conversion noise. Place a 10 µF bulk + 0.1 µF ceramic decoupling pair within 5 mm of the V+ pin. Estimated: at 5V V+ the active quiescent is ~1.7 mA (8.5 mW / 5V) and low-power quiescent is ~0.6 mA (3.0 mW / 5V).
Route CLK, CS, and DO traces over a continuous ground plane and away from the analog input and VREF traces. Keep the analog input traces short and guarded by ground on both sides where possible. The VREF pin is high-impedance; bypass it with at least 0.1 µF (and ideally 1 µF to 10 µF) of low-leakage ceramic directly at the pin. Per TI's typical-application guidance for the ADC08831/32 family, mismatched reference bypass can add several LSBs of gain error.
Three common pitfalls: (1) Driving VREF from a noisy supply - always buffer or LDO the reference; any noise on VREF becomes conversion noise. (2) Leaving CLK toggling in low-power mode - this can prevent proper low-power operation. Stop CLK and hold CS high when idle. (3) Sampling more than one channel back-to-back without waiting the full conversion time tCONV (4 µs max at fC = 2 MHz) - data from the previous conversion will be corrupted.
The serial MICROWIRE interface is TTL/CMOS-compatible, but clock edges couple into the analog input through the package substrate. When sampling at 153 kS/s, keep CLK rise/fall times short (<100 ns) and avoid long CLK traces. If routing CLK across the analog input section is unavoidable, insert a ground trace between them. The DO output transitions during a conversion can couple into the sample-and-hold; many designers gate DO read-out to the LSB end of the conversion to minimize this effect.
合規資訊
RoHS compliance confirmed by NOPB suffix per TI ordering code convention. AEC-Q100 qualification is not applicable - this part is industrial / consumer grade, not automotive grade. Halogen-free status not stated explicitly in the verified web data.
