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ADS8681W

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16-bit, 1MSPS, one-channel, wide bandwidth SAR ADC with programmable input ranges on +5V supply

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Data sheet

ADS8681W

ACTIVE
Data sheet Order now

Product details

Resolution (Bits) 16 Sample rate (max) (ksps) 1000 Number of input channels 1 Interface type Enhanced SPI, SPI Architecture SAR Input type Differential, Single-ended Rating Catalog Reference mode External, Internal Input voltage range (max) (V) 12.288 Input voltage range (min) (V) -12.288 Features Oscillator, Over-Voltage Protection, PGA Operating temperature range (°C) -40 to 125 Power consumption (typ) (mW) 42 Analog supply voltage (min) (V) 4.75 Analog supply voltage (max) (V) 5.25 SNR (dB) 80 Digital supply (min) (V) 1.65 Digital supply (max) (V) 5.25
Resolution (Bits) 16 Sample rate (max) (ksps) 1000 Number of input channels 1 Interface type Enhanced SPI, SPI Architecture SAR Input type Differential, Single-ended Rating Catalog Reference mode External, Internal Input voltage range (max) (V) 12.288 Input voltage range (min) (V) -12.288 Features Oscillator, Over-Voltage Protection, PGA Operating temperature range (°C) -40 to 125 Power consumption (typ) (mW) 42 Analog supply voltage (min) (V) 4.75 Analog supply voltage (max) (V) 5.25 SNR (dB) 80 Digital supply (min) (V) 1.65 Digital supply (max) (V) 5.25
WQFN (RUM) 16 16 mm² 4 x 4
  • 16-bit ADC with integrated analog front-end
  • High speed:
    • ADS8681W: 1MSPS
    • ADS8685W: 500kSPS
    • ADS8689W: 100kSPS
  • Software programmable input ranges:
    • Bipolar differential ranges: ±12.288V, ±10.24V, ±6.144V, ±5.12V, and ±2.56V
    • Unipolar differential ranges: 0V–12.288V, 0V–10.24V, 0V–6.144V, and 0V–5.12V
  • Analog supply (5V): 1.65V to 5V I/O supply
  • Constant resistive input impedance ≥ 1MΩ
  • Input bandwidth: 450kHz
  • Input overvoltage protection: Up to ±20V
  • On-chip, 4.096V reference with low drift
  • Excellent performance:
    • DNL: ±0.6LSB; INL: ±0.6LSB
    • SNR: 80dB; THD: –105dB
  • ALARM feature with high, low threshold
  • multiSPI™ interface with daisy-chain
  • Temperature range: –40°C to +125°C
  • 16-bit ADC with integrated analog front-end
  • High speed:
    • ADS8681W: 1MSPS
    • ADS8685W: 500kSPS
    • ADS8689W: 100kSPS
  • Software programmable input ranges:
    • Bipolar differential ranges: ±12.288V, ±10.24V, ±6.144V, ±5.12V, and ±2.56V
    • Unipolar differential ranges: 0V–12.288V, 0V–10.24V, 0V–6.144V, and 0V–5.12V
  • Analog supply (5V): 1.65V to 5V I/O supply
  • Constant resistive input impedance ≥ 1MΩ
  • Input bandwidth: 450kHz
  • Input overvoltage protection: Up to ±20V
  • On-chip, 4.096V reference with low drift
  • Excellent performance:
    • DNL: ±0.6LSB; INL: ±0.6LSB
    • SNR: 80dB; THD: –105dB
  • ALARM feature with high, low threshold
  • multiSPI™ interface with daisy-chain
  • Temperature range: –40°C to +125°C

The ADS8681W, ADS8685W, and ADS8689W are an integrated data acquisition system family based on a successive approximation (SAR) analog-to-digital converter (ADC) topology. The devices feature a high-speed, high-precision SAR ADC, integrated differential analog front-end (AFE) input driver circuit. The ADS868xW includes an overvoltage protection circuit up to ±20V and an on-chip 4.096V reference with extremely low temperature drift.

The devices operate on a single 5V analog supply, but support true bipolar input ranges and unipolar input ranges. The bipolar input ranges are ±12.288V, ±6.144V, ±10.24V, ±5.12V, and ±2.56V, and the unipolar input ranges are from 0V to 12.288V, 10.24V, 6.144V, and 5.12V. The devices offer a high resistive input impedance (≥ 1MΩ) irrespective of the selected input range.

The multiSPI digital interface is backward-compatible to the traditional SPI protocol. Additionally, configurable features simplify interface to a wide range of host controllers.

The ADS8681W, ADS8685W, and ADS8689W are an integrated data acquisition system family based on a successive approximation (SAR) analog-to-digital converter (ADC) topology. The devices feature a high-speed, high-precision SAR ADC, integrated differential analog front-end (AFE) input driver circuit. The ADS868xW includes an overvoltage protection circuit up to ±20V and an on-chip 4.096V reference with extremely low temperature drift.

The devices operate on a single 5V analog supply, but support true bipolar input ranges and unipolar input ranges. The bipolar input ranges are ±12.288V, ±6.144V, ±10.24V, ±5.12V, and ±2.56V, and the unipolar input ranges are from 0V to 12.288V, 10.24V, 6.144V, and 5.12V. The devices offer a high resistive input impedance (≥ 1MΩ) irrespective of the selected input range.

The multiSPI digital interface is backward-compatible to the traditional SPI protocol. Additionally, configurable features simplify interface to a wide range of host controllers.
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* Data sheet ADS868xW 16-Bit, High-Speed, Single-Supply, SAR ADC Data Acquisition System With Programmable, Bipolar Input Ranges datasheet (Rev. A) PDF | HTML 23 May 2025
Application brief Precision ADCs in Servo Drives (Rev. A) PDF | HTML 29 Oct 2025

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The ADS8681WEVM-PDK is a platform for evaluating the performance of the ADS8681W, an integrated data acquisition system based on a successive approximation register (SAR) analog-to-digital converter (ADC). This device features a high-speed, high-precision SAR ADC, integrated differential analog (...)
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