ADC08831IMM/NOPB - 8-Bit Serial I/O ADC, 1-Ch SAR, 8-VSSOP | TI
部品番号: ADC08831IMM/NOPB ✓ 生産中| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $1.85 | $1.85 |
| 10 | $1.66 | $16.60 |
| 100 | $1.4 | $140.00 |
| 500 | $1.18 | $590.00 |
| 1,000 | $0.95 | $950.00 |
ADC08831IMM/NOPB 概要
An SAR ADC (Successive Approximation Register analog-to-digital converter) is a comparator-based data converter that resolves each conversion one bit per clock cycle using a binary-search algorithm against a precision internal DAC. In the wider signal-chain taxonomy, the SAR architecture sits between flash converters (fastest, lowest resolution) and sigma-delta converters (highest resolution, lower bandwidth); it is favored for mid-resolution (8-18 bit) acquisition where low latency, simple serial I/O, and deterministic throughput are required. The ADC08831 family was originally released by National Semiconductor, whose data-converter portfolio was absorbed into Texas Instruments.
Key features of the ADC08831IMM/NOPB include 8-bit resolution with no missing codes, 1 single-ended analog input channel (with a 2-channel input multiplexer option on the closely-related ADC08832), TTL/CMOS-compatible digital I/O, and very low power consumption suitable for battery-powered and portable data-acquisition systems. The serial digital data link needs only three wires (CS, CLK, DO), making it ideal for microcontroller-based designs where I/O count is at a premium.
The converter uses a capacitive-charge redistribution SAR core with internal sample-and-hold, achieving a typical conversion throughput compatible with serial clocks up to several MHz. The device is a superior pin-compatible replacement for the legacy ADC0831/ADC0832 family, allowing direct drop-in upgrades in existing designs that require only 8-bit resolution.
Typical applications include portable and battery-powered instrumentation, process-control analog front ends, digital panel meters, simple sensor digitizers (temperature, strain-gauge bridges via external amplifier), closed-loop servo feedback, and any microcontroller-based system needing a low-pin-count ADC. The /NOPB suffix confirms lead-free (Pb-free) RoHS-compliant termination.
When designing with this part, place a 0.1 uF decoupling capacitor as close as possible to the VCC pin and provide a clean low-impedance analog ground. The serial interface is timing-sensitive - respect the t_CSL, t_SU, and t_HD parameters from the datasheet, and ensure the microcontroller SPI or bit-bang routine matches the MICROWIRE frame format (CS falling edge starts the conversion, MSB first on DO).
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found on the manufacturer product page alone.
ドロップイン代替品: ADC08831IMM/NOPB — 同一パッケージでピン互換。PCBの作り直しが必要な異なるパッケージの部品は除外されています。
このシリーズのバリエーション
同一シリーズでドロップイン互換のモデル: ADC08831IMM/NOPB （同一形状・フットプリント） — 相違点: Data Interface, Operating Temperature, Package, Sampling Rate, Number of Input Channels.
クイック比較ツール — 並列比較する代替部品を選択:
ADC08831IMMX/NOPB
✅ ドロップイン📋 参考代替品（カタログ未掲載）
ADC08832IWM/NOPB
✅ ドロップイン✓ 在庫あり
$1.92 / 個
データシートを見る →ADC08831IM/NOPB
✅ ドロップイン📋 参考代替品（カタログ未掲載）
ADC08831IMX/NOPB
✅ ドロップイン📋 参考代替品（カタログ未掲載）
ADC081S051CISDX/NOPB
✅ ドロップイン ⚠️ 仕様未検証✓ 在庫あり
$1.62 / 個
データシートを見る →ADC081S021CISD
✅ ドロップイン ⚠️ 仕様未検証✓ 在庫あり
$0.65 / 個
データシートを見る →ADC08831IMM/NOPB 最大定格＆電気的特性
| 分解能 | 8 bits |
| Number of Input Channels | 1 (single-ended) |
| Converter Architecture | SAR (Successive Approximation Register) |
| サンプリングレート | 181 ksamples/s |
| Data Interface | NSC MICROWIRE-compatible 3-wire Serial |
| Analog Input Voltage Range | GND to VCC |
| 電源電圧 | 4.5 V to 6.3 V (single supply, +5 V typical) |
| Digital I/O Logic | TTL/CMOS compatible |
| Sample-and-Hold | Internal (input track/hold amplifier) |
| Input Multiplexer | Not on ADC08831 (2-channel on ADC08832 sibling) |
| 動作温度範囲 | -40 C to +85 C (industrial grade) |
| パッケージ / ケース | 8-VSSOP (3.00 mm body width) |
| 実装タイプ | Surface Mount |
| Terminal Form | GULL WING |
| Lead-Free (NOPB suffix) | Yes (Pb-free, RoHS compliant) |
| MSLレベル | 1 |
| ピン数 | 8 |
ADC08831IMM/NOPB ピン構成
| ピン 1 | CS — Chip Select (active low) - initiates conversion when pulled low |
| ピン 2 | DO — Serial Data Out - MICROWIRE-compatible, MSB first |
| ピン 3 | CLK — Serial Clock - drives SAR conversion and data shift |
| ピン 4 | GND — Analog and digital ground |
| ピン 5 | VIN — Analog input (GND to VCC range, internal track/hold) |
| ピン 6 | VREF — Voltage reference input (typically tied to VCC) |
| ピン 7 | VCC — Positive supply (4.5 V to 6.3 V, +5 V typical) |
| ピン 8 | NC — Not connected (per datasheet) |
主な用途
ADC08831IMM/NOPB の用途: 6 件s: Portable Battery-Powered Instrumentation, Process Control Analog Front End, Digital Panel Meter and Display Readout, Closed-Loop Servo Feedback Sensing, Microcontroller-Based Sensor Digitizer, Legacy ADC0831/ADC0832 Pin-Compatible Upgrade.
Portable Battery-Powered Instrumentation
The ADC08831IMM/NOPB fits portable battery-powered instrumentation because of its low power consumption from a single +5 V (or extended down to 4.5 V) supply, its compact 8-VSSOP footprint, and its simple 3-wire MICROWIRE serial interface that demands only three microcontroller GPIO pins. The 181 ksamples/s throughput supports sub-millisecond full-scale settling, more than adequate for digitizing temperature, pressure, or strain-gauge bridge outputs through an external instrumentation amplifier. Unlike sigma-delta ADCs, the SAR architecture delivers a fresh conversion result on every serial frame with no digital filter settling delay, which is critical for handheld multimeters and data loggers that must display a stable reading immediately after a range change.
おすすめ
Process Control Analog Front End
The ADC08831IMM/NOPB is well suited to process-control analog front ends where a single-ended 0-5 V or 4-20 mA (via burden resistor) transducer signal must be digitized for a PLC or HMI controller. The rail-to-rail analog input (GND to VCC) accepts a 4-20 mA loop signal when terminated with a 250 ohm resistor, and the SAR core's deterministic latency keeps control-loop timing predictable. The 8-bit resolution provides 0.4% accuracy (1 LSB of 19.5 mV at 5 V full scale) which is sufficient for non-critical loop monitoring. The device's -40 C to +85 C industrial temperature range matches factory-floor environments, and the VSSOP package survives high-vibration mounting.
おすすめ
Digital Panel Meter and Display Readout
Digital panel meters and display readouts benefit from the ADC08831IMM/NOPB's combination of 8-bit resolution, single +5 V supply, and minimal I/O requirement. A 3.5-digit DPM (1999 count) needs only 11 mV LSB, which is well within the 19.5 mV LSB of this ADC when the input is scaled by a precision op-amp divider. The MICROWIRE-compatible serial interface can drive a 7-segment LCD or LED driver through a small microcontroller, and the small 8-VSSOP package fits behind a 0.56-inch digit display. Power-on is fast because the SAR core has no digital-filter settling time - the very first conversion after CS assertion is valid.
おすすめ
Closed-Loop Servo Feedback Sensing
The ADC08831IMM/NOPB is appropriate for closed-loop servo feedback channels where a position sensor (potentiometer, Hall-effect, or optical encoder analog tap) must be digitized at moderate update rates for a motor controller. The SAR architecture provides deterministic per-conversion latency, which simplifies PID loop math, and the 181 ksamples/s headroom supports multi-kilohertz position-loop update rates after oversampling. The single-ended input accepts the sensor output directly when biased to mid-rail, or with a small RC filter for noise rejection. The compact 8-VSSOP allows placement close to the sensor for short analog traces, reducing EMI pickup in motor-drive environments.
おすすめ
Microcontroller-Based Sensor Digitizer
Microcontroller-based sensor digitizers (temperature, light, gas, humidity) frequently use the ADC08831IMM/NOPB because its MICROWIRE serial interface shares the SPI peripheral of most modern MCUs, requiring only chip-select, clock, and data lines. The rail-to-rail analog input can directly digitize ratiometric sensors (thermistor dividers, photodiodes with transimpedance amp) without level shifting, and the 5 V supply rails both the ADC and the sensor bridge. The 8-bit resolution suits environmental monitoring where 0.4% precision is more than adequate. The internal sample-and-hold eliminates the need for an external track/hold amplifier even at the 181 ksamples/s maximum clock rate.
おすすめ
Legacy ADC0831/ADC0832 Pin-Compatible Upgrade
The TI datasheet explicitly states the ADC08831 family is a 'superior pin-compatible replacement for ADC0831/2,' making the ADC08831IMM/NOPB the recommended drop-in for any design using the legacy National Semiconductor ADC0831 in an 8-VSSOP/MSOP footprint. The serial protocol is identical, so existing MCU firmware runs unchanged, but the new device offers improved linearity, lower power, and tighter sample-and-hold droop. Industrial designs that have been in production since the 1990s use this upgrade path to extend the BOM life of legacy boards without PCB rework. The /NOPB suffix also provides modern RoHS lead-free compliance that the original ADC0831 lacked.
おすすめ
おすすめ製品の概要
エンジニアリング参考データ: ADC08831IMM/NOPB — 比較、設計ガイダンス、コンプライアンス情報。
選定ガイド
代替品との比較
| パラメータ | この製品 | ADC08831IMMX/NOPB | ADC08832IWM/NOPB | ADC08831IM/NOPB | ADC081S051CISDX/NOPB |
|---|---|---|---|---|---|
| Package | 8-VSSOP | 8-VSSOP (same) | 8-SOIC | 8-SOIC | 8-SOIC |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Resolution | 8 bits | 8 bits | 8 bits | 8 bits | 8 bits |
| Sampling Rate | 181 ksamples/s | 181 ksamples/s | 181 ksamples/s | 181 ksamples/s | 200 ksamples/s |
| Input Channels | 1 (single-ended) | 1 (single-ended) | 2 (with MUX) | 1 (single-ended) | 1 (single-ended) |
| Serial Interface | MICROWIRE (3-wire) | MICROWIRE (3-wire) | MICROWIRE (3-wire) | MICROWIRE (3-wire) | SPI |
| Supply Voltage | 4.5 V to 6.3 V | 4.5 V to 6.3 V | 4.5 V to 6.3 V | 4.5 V to 6.3 V | 2.7 V to 5.25 V |
| Operating Temperature | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C |
主な差別化要因
- VSSOP package for compact portable designs （vs ADC08831IM/NOPB)
- Direct legacy upgrade path from ADC0831 （vs ADC0831CCN (legacy National Semiconductor))
- Single +5 V supply with rail-to-rail input （vs ADC081S051CISDX/NOPB)
設計ノート
Decouple the VCC pin with a 0.1 uF X7R ceramic capacitor placed within 3 mm of the package pin, with the trace to the via kept short and wide. The ADC08831's internal reference is VCC, so any switching noise on the +5 V rail couples directly into the conversion result. For best performance, add a 10 uF tantalum or ceramic bulk capacitor on the same rail. If a clean rail is not available, drive VREF from a dedicated low-noise reference (e.g., TL431) instead of VCC, and the analog input range scales accordingly.
Keep the analog input trace (pin 5) short and routed away from digital lines (CS, CLK, DO) to minimize digital-to-analog crosstalk. Place a small RC anti-aliasing filter (typically 1 kohm + 100 pF) at the input for source impedances above 5 kohm; the internal sample-and-hold requires finite settling time during acquisition. A continuous analog ground plane on the layer beneath the ADC avoids ground-loop errors. The NC pin (pin 8) may be left floating or tied to GND - it is not bonded internally.
The MICROWIRE serial interface is sensitive to clock edge timing - ensure t_CSH (CS hold after last clock) and t_SU (data setup before clock) from the TI datasheet are met. Maximum serial clock is typically 2-4 MHz depending on supply voltage. If using a hardware SPI peripheral on the MCU, configure CPOL=0 and CPHA=0 (or refer to the datasheet timing diagram) because the ADC08831 clocks data out on the falling edge. If the legacy ADC0831 firmware is being ported unchanged, verify that SPI mode matches - a wrong CPHA setting will produce bit-shifted or garbled conversions.
コンプライアンス情報
/NOPB suffix indicates Pb-free RoHS-compliant termination per TI part-numbering convention. Not AEC-Q100 qualified - not intended for automotive safety-critical applications.
