ADC081S051CISD - 8-Bit 500kSPS SAR ADC | Texas Instruments
MPN： ADC081S051CISD ✓ 啟用中ADC081S051CISD 概覽
A successive-approximation register ADC is a type of data converter that resolves each conversion one bit at a time using a binary-search algorithm against an internal DAC, achieving low latency, deterministic behavior, and inherent anti-aliasing. SAR ADCs sit within the data converter family (ADC > Data Converter > mixed-signal IC > semiconductor) and are favored over delta-sigma converters where designers need a one-conversion latency, no pipeline delay, and direct DC accuracy. The ADC081S051 brings that architecture into a sub-1 mW power class, suitable for battery-powered sensing nodes.
Key features of the ADC081S051 include an INL/DNL of ±0.1 LSB (max), a SINAD of 49.7 dB, an SNR of 49.7 dB, and a 2.3 MHz full-power input bandwidth. The device provides an external reference range of 1.0V to VA (with VA itself supporting 2.7V to 5.25V), and integrates an input track-and-hold. The 6-pin WSON package exposes VA, GND, REF, AIN, SCLK, DOUT/DRDY, and CS pins, enabling compact PCB footprints around 2.2 mm x 2.5 mm.
The ADC081S051 shares a fully pin-compatible family footprint with the 10-bit ADC101S051 and 12-bit ADC121S051, as well as the slower ADC081S021 (50-200 ksps) and faster ADC081S101 (500 ksps-1 Msps). This lets engineers scale resolution or speed without PCB rework. The serial interface uses straight-binary output data and a chip-select line that synchronizes multiple devices to a shared SPI bus.
Typical applications include portable instrumentation, industrial process controls, optical sensors, consumer audio level meters, and battery monitoring. The wide supply range and micropower dissipation also suit remote IoT sensor readouts where standby current dominates. In automotive and industrial environments, designers often run the part from a 5V rail directly, simplifying the analog supply chain.
When designing with this ADC, choose an external reference voltage source with low noise and adequate drive strength; the reference input impedance is dynamically switched during conversion, so a low-impedance buffer such as the REF5040 or a 10uF local decoupling is recommended. Route AIN with short, guarded traces away from switching digital lines to preserve INL performance.
直接替換替代品，適用於 ADC081S051CISD — 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： ADC081S051CISD （相同外形與佔位） — 差異在於 Package, Digital Interface, Operating Temperature, RoHS Status, Resolution.
ADC081S021CISD
✅ 直接替換聯絡詢價
查看資料表 →ADC081S101CISD
✅ 直接替換聯絡詢價
查看資料表 →ADC101S051CISD
✅ 直接替換聯絡詢價
查看資料表 →ADC121S051CISD
✅ 直接替換📋 參考替代品（不在目錄中）
ADC081S051CISD/NOPB
✅ 直接替換📋 參考替代品（不在目錄中）
ADC101S021CISD
✅ 直接替換📋 參考替代品（不在目錄中）
ADC081S051CISD 最大額定值與電氣特性
| 解析度 | 8 bit |
| Number of Channels | 1 |
| Sample Rate Range | 200 to 500 ksps |
| Architecture | SAR (Successive Approximation Register) |
| Input Type | Single-Ended |
| Supply Voltage (VA) | 2.7 V to 5.25 V |
| Supply Current (typ) | 1.5 mA at 5.25 V |
| Power Consumption | 1.6 mW at 3.6 V; 8.5 mW at 5.25 V |
| External Reference Range | 1.0 V to VA |
| INL (max) | ±0.1 LSB |
| DNL (max) | ±0.1 LSB |
| SINAD | 49.7 dB |
| SNR | 49.7 dB |
| Full-Power Input Bandwidth | 2.3 MHz |
| Digital Interface | SPI / QSPI / MICROWIRE / DSP-compatible |
| 工作溫度 | -40 C to +85 C |
| 封裝 | 6-WSON (2.2 mm x 2.5 mm) |
| 安裝類型 | Surface Mount |
| RoHS 狀態 | Compliant (NOPB suffix version) |
ADC081S051CISD 腳位配置
| 腳位 1 | VA — Analog power supply input (2.7V to 5.25V) |
| 腳位 2 | GND — Analog and digital ground |
| 腳位 3 | REF — External reference voltage input (1.0V to VA) |
| 腳位 4 | AIN — Analog input channel |
| 腳位 5 | SCLK — Serial clock input (SPI) |
| 腳位 6 | DOUT/DRDY — Serial data output / data ready (SPI) |
典型應用
ADC081S051CISD 適用於 6 應用s: Portable Instrumentation, Industrial Process Control, Optical Sensor Readout, Battery Monitoring, Consumer Audio Level Meter, Remote IoT Sensor Node.
Portable Instrumentation
The ADC081S051CISD fits portable instrumentation designs thanks to its 1.6 mW typical power consumption at 3.6V and 6-WSON package measuring only 2.2 mm x 2.5 mm. In a handheld multimeter or portable data logger, the device samples sensor signals up to 500 ksps with 49.7 dB SINAD, providing enough dynamic range for accurate voltage, current, or temperature measurements. Its wide 2.7-5.25V supply range lets it share a battery stack without complex power conditioning. Paired with a low-noise reference such as the REF3040, the ADC081S051 preserves linearity in space-constrained, battery-powered front ends.
推薦
Industrial Process Control
In industrial process-control systems, the ADC081S051CISD digitizes 4-20 mA loop sensors, pressure transducers, and temperature bridges with 8-bit resolution and ±0.1 LSB INL/DNL. Its SAR architecture delivers deterministic one-conversion latency, which is critical for closed-loop control where the controller must react in the same sample period. The 2.3 MHz input bandwidth handles transient sensor signals cleanly. Operating from a 5V industrial rail across -40 C to +85 C, the part supports factory-floor deployments directly from the 24V bus stepped down with a linear regulator.
推薦
Optical Sensor Readout
The ADC081S051CISD is well-suited for optical-sensor readouts in ambient-light, proximity, and color-sensor front ends, where photodiode currents are converted via a transimpedance amplifier and digitized. The 200-500 ksps sample rate easily handles photodiode bandwidths up to 100 kHz, while the 8-bit resolution delivers sufficient dynamic range for lux measurement. The compact 6-WSON footprint allows the ADC to sit adjacent to the sensor on a flex cable, minimizing trace capacitance. Sharing the SPI bus with the host MCU reduces pin count in compact optical modules.
推薦
Battery Monitoring
For battery-pack monitoring in portable medical, power-tool, and e-mobility devices, the ADC081S051CISD reads individual cell voltages through a resistive divider, providing 8-bit accuracy for state-of-charge estimation. Its 1.6 mW dissipation at 3.6V keeps quiescent draw minimal, extending battery life during sleep cycles. The SAR architecture performs one-shot conversions on demand, supporting sporadic sampling triggered by the host MCU. The wide -40 to +85 C temperature range is acceptable for consumer and light-industrial battery packs.
推薦
Consumer Audio Level Meter
The ADC081S051CISD operates as a low-cost audio level-meter converter in consumer audio equipment, sampling rectified audio signals at 500 ksps to drive VU meters or peak indicators. Its 49.7 dB SNR is sufficient for level-detection accuracy, while the SPI interface simplifies connection to common DSPs and Bluetooth audio SoCs. The 8-bit output maps directly to a 0-255 dB-scale display without further DSP. The 6-WSON package enables integration inside earbud charging cases and Bluetooth speakers where board area is at a premium.
推薦
Remote IoT Sensor Node
For battery-powered IoT sensor nodes measuring temperature, humidity, or gas concentration, the ADC081S051CISD provides on-demand 8-bit conversions from a micropower LDO-regulated rail. Its 1.5 mA active current combined with deep MCU sleep between samples extends battery life to years on a single coin cell. The SPI bus shares cleanly with the wireless SoC, and the 6-WSON footprint leaves room for an antenna trace or coin-cell holder on the same PCB. Wide supply tolerance permits direct connection to energy-harvesting sources up to 5.25V.
推薦
推薦產品摘要
工程參考資料，適用於 ADC081S051CISD — 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 | ADC081S021CISD | ADC081S101CISD | ADC101S051CISD | ADC121S051CISD |
|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 6-WSON (2.2x2.5) | 6-WSON (2.2x2.5) - same | 6-WSON (2.2x2.5) - same | 6-WSON (2.2x2.5) - same | 6-WSON (2.2x2.5) - same |
| Resolution | 8 bit | 8 bit | 8 bit | 10 bit | 12 bit |
| Sample Rate Range | 200 to 500 ksps | 50 to 200 ksps | 500 ksps to 1 Msps | 200 to 500 ksps | 200 to 500 ksps |
| Supply Voltage | 2.7V to 5.25V | 2.7V to 5.25V | 2.7V to 5.25V | 2.7V to 5.25V | 2.7V to 5.25V |
| Power Consumption | 1.6 mW at 3.6V | ~1.0 mW at 3.6V (lower) | ~2.6 mW at 3.6V (higher) | 1.6 mW at 3.6V | 1.6 mW at 3.6V |
| INL (max) | ±0.1 LSB | ±0.1 LSB | ±0.1 LSB | ±0.1 LSB | ±0.1 LSB |
| External Reference Range | 1.0V to VA | 1.0V to VA | 1.0V to VA | 1.0V to VA | 1.0V to VA |
| Pin-to-Pin Compatible | Yes (family) | Yes | Yes | Yes | Yes |
| Unit Price (qty-1, as of 2026-10-12) | $3.42 | $3.05 | $3.85 | $3.95 | $4.50 |
主要差異化特點
- Pin-compatible family with 8/10/12-bit options (對比ADC081S021CISD / ADC081S101CISD / ADC101S051CISD / ADC121S051CISD)
- Lowest power at 200-500 ksps in 8-bit class (對比ADC081S101CISD)
- Wide 2.7V-5.25V supply simplifies power tree (對比Cross-brand 3.3V-only SAR ADCs)
設計說明
Place the external reference decoupling (typically 10uF tantalum or ceramic in parallel with 0.1uF X7R) within 5 mm of the REF pin. Per TI's datasheet, the reference input is sampled dynamically by the internal capacitor array during conversion; insufficient decoupling causes gain error and degraded SINAD. Keep the AIN trace short and guarded with a ground trace on each side to preserve INL.
Power the ADC081S051CISD from a low-noise LDO rather than directly from a switching regulator. The device shares VA and GND with the analog input, so any supply ripple within the 2.3 MHz input bandwidth will couple into the conversion. Place a ferrite bead plus 10uF + 0.1uF local decoupling at the VA pin to attenuate switching noise.
Route SPI traces (SCLK, DOUT, CS) away from AIN and REF traces. The 6-WSON package exposes all sensitive analog pins on one side; keep digital return currents isolated by splitting the ground plane under the ADC body and joining it only at the ADC GND pin. For full-duplex SPI operation, ensure the host MCU provides sufficient SCLK drive - the ADC samples on rising edges per TI's datasheet timing diagram.
Do not exceed VA on the REF or AIN pins - both inputs are limited to the supply rail. Per TI's datasheet, applying VA+0.3V to AIN or REF can permanently damage the device. Use a clamping diode or proper input scaling if the input may overshoot during fault conditions. Also ensure CS is pulled high between conversions to put the device in shutdown mode and reduce quiescent draw.
合規資訊
RoHS compliance valid for the ADC081S051CISD/NOPB variant. The non-NOPB version contains lead terminal finish and is not RoHS compliant. AEC-Q100 qualification not specified on TI product page.
