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ADS8688W

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16-bit, 500-kSPS, eight-channel, single-supply SAR ADC with ±12-V differential inputs

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Data sheet

ADS8688W

ACTIVE
Data sheet Order now

Product details

Resolution (Bits) 16 Sample rate (max) (ksps) 500 Number of input channels 8 Interface type SPI Architecture SAR Input type Differential, Single-ended Multichannel configuration Multiplexed Rating Catalog Reference mode External, Internal Input voltage range (max) (V) 10.24 Input voltage range (min) (V) -10.24 Features Daisy-Chainable, Oscillator, Over-Voltage Protection, PGA Operating temperature range (°C) -40 to 125 Power consumption (typ) (mW) 65 Analog supply voltage (min) (V) 4.75 Analog supply voltage (max) (V) 5.25 SNR (dB) 85 Digital supply (min) (V) 1.65 Digital supply (max) (V) 5.25
Resolution (Bits) 16 Sample rate (max) (ksps) 500 Number of input channels 8 Interface type SPI Architecture SAR Input type Differential, Single-ended Multichannel configuration Multiplexed Rating Catalog Reference mode External, Internal Input voltage range (max) (V) 10.24 Input voltage range (min) (V) -10.24 Features Daisy-Chainable, Oscillator, Over-Voltage Protection, PGA Operating temperature range (°C) -40 to 125 Power consumption (typ) (mW) 65 Analog supply voltage (min) (V) 4.75 Analog supply voltage (max) (V) 5.25 SNR (dB) 85 Digital supply (min) (V) 1.65 Digital supply (max) (V) 5.25
— (—) — See data sheet TSSOP (DBT) 38 62.08 mm² (9.7 mm × 6.4 mm)
  • 16-Bit ADCs with Integrated Analog Front-End
  • 4-, 8-Channel MUX with Auto and Manual Scan
  • Channel-Independent Programmable Inputs:
    • ±12.288V, ±6.144V, and ±3.072V
    • 12.288V to 0V and 6.144V to 0V
  • 5V Analog Supply: 1.65V to 5V I/O Supply
  • Constant Resistive Input Impedance: 1.2MΩ
  • Input Overvoltage Protection: Up to ±20V
  • On-Chip, 4.096V Reference with Low Drift
  • Excellent Performance:
    • 500kSPS Aggregate Throughput
    • DNL: ±0.6LSB; INL: ±0.8LSB
    • Low Drift for Gain Error and Offset
    • SNR: 91.5dB; THD: –102dB
    • Low Power: 65mW
  • AUX Input → Direct Connection to ADC Inputs
  • ALARM → High and Low Thresholds per Channel
  • SPI™-Compatible Interface with Daisy-Chain
  • Industrial Temperature Range: –40°C to 125°C
  • 16-Bit ADCs with Integrated Analog Front-End
  • 4-, 8-Channel MUX with Auto and Manual Scan
  • Channel-Independent Programmable Inputs:
    • ±12.288V, ±6.144V, and ±3.072V
    • 12.288V to 0V and 6.144V to 0V
  • 5V Analog Supply: 1.65V to 5V I/O Supply
  • Constant Resistive Input Impedance: 1.2MΩ
  • Input Overvoltage Protection: Up to ±20V
  • On-Chip, 4.096V Reference with Low Drift
  • Excellent Performance:
    • 500kSPS Aggregate Throughput
    • DNL: ±0.6LSB; INL: ±0.8LSB
    • Low Drift for Gain Error and Offset
    • SNR: 91.5dB; THD: –102dB
    • Low Power: 65mW
  • AUX Input → Direct Connection to ADC Inputs
  • ALARM → High and Low Thresholds per Channel
  • SPI™-Compatible Interface with Daisy-Chain
  • Industrial Temperature Range: –40°C to 125°C

The ADS8684W and ADS8688W are 4-channel and 8-channel, integrated data acquisition systems based on a 16-bit successive approximation (SAR) analog-to-digital converter (ADC), operating at a throughput of 500kSPS. The devices feature integrated analog front-end circuitry for each input channel with overvoltage protection up to ±20V, a 4-channel or 8-channel multiplexer with automatic and manual scanning modes, and an on-chip, 4.096V reference with low temperature drift. Operating on a single 5V analog supply, each input channel on the devices can independently support bipolar input ranges of ±12.288V, ±6.144V, and ±3.072V and unipolar input ranges of 12.288V to 0V and 6.144V to 0V.

The ADS8684W and ADS8688W offer a simple SPI-compatible serial interface to the digital host and also support daisy-chaining of multiple devices. The digital supply operates from 1.65V to 5.25V, enabling direct interface to a wide range of host controllers.

The ADS8684W and ADS8688W are 4-channel and 8-channel, integrated data acquisition systems based on a 16-bit successive approximation (SAR) analog-to-digital converter (ADC), operating at a throughput of 500kSPS. The devices feature integrated analog front-end circuitry for each input channel with overvoltage protection up to ±20V, a 4-channel or 8-channel multiplexer with automatic and manual scanning modes, and an on-chip, 4.096V reference with low temperature drift. Operating on a single 5V analog supply, each input channel on the devices can independently support bipolar input ranges of ±12.288V, ±6.144V, and ±3.072V and unipolar input ranges of 12.288V to 0V and 6.144V to 0V.

The ADS8684W and ADS8688W offer a simple SPI-compatible serial interface to the digital host and also support daisy-chaining of multiple devices. The digital supply operates from 1.65V to 5.25V, enabling direct interface to a wide range of host controllers.
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* Data sheet ADS868xW 16 -Bit, 500 kSPS, 4- and 8-Channel, Single-Supply, SAR ADCs With Bipolar Input Ranges datasheet (Rev. A) PDF | HTML Jun 16, 2026
Circuit design High common-mode differential input voltage to ±10-V ADC input circuit (Rev. A) PDF | HTML Sep 24, 2024
Circuit design Reducing effects of external RC filter circuit on gain and drift error (Rev. B) PDF | HTML Sep 19, 2024
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Circuit design Circuit for protecting ADC with TVS diode and PTC fuse PDF | HTML Aug 3, 2020
Application note Extending Input Voltage Range and Understanding Associated Errors for ADC With I Nov 9, 2018
Technical article Improving sensor DAQ performance using the PRU-ICSS for grid protection and contro PDF | HTML Oct 9, 2018
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White paper Voltage-reference impact on total harmonic distortion Aug 1, 2016
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User guide Phase-Compensated 8-Ch Multiplexed Data Acquisition System for Power Automation (Rev. B) Mar 12, 2015

Design & development

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Evaluation board

BOOSTXL-ADS8688W — ADS8688W BoosterPack™ plug-in module

The ADS8688W BoosterPack™ Plug-in Module (BOOSTXL-ADS8688W) provides a cost effective and accessible platform for developing applications using the ADS8688W. This module is compatible with the LP-MSPM0G3507 LaunchPad™ evaluation kit, and includes headers to support use with other controllers. (...)
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ANALOG-ENGINEER-CALC — PC software analog engineer's calculator

The analog engineer’s calculator is designed to speed up many of the repetitive calculations that analog circuit design engineers use on a regular basis. This PC-based tool provides a graphical interface with a list of various common calculations ranging from setting operational-amplifier (...)

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