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ADS8688AT

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16-bit, 500kSPS 8-channel SAR ADC with bipolar inputs using 5V low-drift VREF and wide temp range

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Data sheet

ADS8688AT

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 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) -55 to 125 Power consumption (typ) (mW) 65 Analog supply voltage (min) (V) 4.75 Analog supply voltage (max) (V) 5.25 SNR (dB) 92 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 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) -55 to 125 Power consumption (typ) (mW) 65 Analog supply voltage (min) (V) 4.75 Analog supply voltage (max) (V) 5.25 SNR (dB) 92 Digital supply (min) (V) 1.65 Digital supply (max) (V) 5.25
TSSOP (DBT) 38 62.08 mm² 9.7 x 6.4
  • 16-Bit ADC With Integrated Analog Front-End
  • 8-Channel MUX With Auto and Manual Scan
  • Channel-Independent Programmable Inputs:
    • ±10.24 V, ±5.12 V, ±2.56 V, ±1.28 V, ±0.64 V
    • 10.24 V, 5.12 V, 2.56 V, 1.28 V
  • 5-V Analog Supply: 1.65-V to 5-V I/O Supply
  • Constant Resistive Input Impedance: 1 MΩ
  • Input Overvoltage Protection: Up to ±20 V
  • Integrated 4.096-V Reference With 6 ppm/°C Drift
  • Excellent Performance:
    • 500-kSPS Aggregate Throughput
    • DNL: ±0.5 LSB; INL: ±0.75 LSB
    • 1-ppm/°C Drift for Gain Error and Offset
    • SNR: 92 dB; THD: –102 dB
    • Low Power: 65 mW
  • AUX Input → Direct Connection to ADC Inputs
  • ALARM → High and Low Thresholds per Channel
  • SPI™-Compatible Interface With Daisy-Chain
  • Temperature Range: –55°C to +125°C
  • TSSOP-38 Package (9.7 mm × 4.4 mm)
  • 16-Bit ADC With Integrated Analog Front-End
  • 8-Channel MUX With Auto and Manual Scan
  • Channel-Independent Programmable Inputs:
    • ±10.24 V, ±5.12 V, ±2.56 V, ±1.28 V, ±0.64 V
    • 10.24 V, 5.12 V, 2.56 V, 1.28 V
  • 5-V Analog Supply: 1.65-V to 5-V I/O Supply
  • Constant Resistive Input Impedance: 1 MΩ
  • Input Overvoltage Protection: Up to ±20 V
  • Integrated 4.096-V Reference With 6 ppm/°C Drift
  • Excellent Performance:
    • 500-kSPS Aggregate Throughput
    • DNL: ±0.5 LSB; INL: ±0.75 LSB
    • 1-ppm/°C Drift for Gain Error and Offset
    • SNR: 92 dB; THD: –102 dB
    • Low Power: 65 mW
  • AUX Input → Direct Connection to ADC Inputs
  • ALARM → High and Low Thresholds per Channel
  • SPI™-Compatible Interface With Daisy-Chain
  • Temperature Range: –55°C to +125°C
  • TSSOP-38 Package (9.7 mm × 4.4 mm)

The ADS8688AT is an 8-channel, integrated data acquisition system based on a 16-bit successive approximation (SAR) analog-to-digital converter (ADC), operating at a throughput of up to 500 kSPS. The device features integrated analog front-end circuitry for each input channel with up to ±20-V overvoltage protection, an 8-channel multiplexer with automatic and manual scanning modes, and an integrated 4.096-V reference with low temperature drift.

Operating on a single 5-V analog supply, each input channel can support multiple true bipolar as well as unipolar input ranges. Each input range is software-programmable and independent for each channel, enabling maximum system flexibility. The analog front-end gain is accurately trimmed to ensure high dc precision for all input ranges. The device offers a 1-MΩ constant resistive input impedance for any selected input range, enabling direct sensor connection to the device.

The ADS8688AT offers a simple SPI-compatible serial interface to the digital host and also supports daisy-chaining of multiple devices. The digital supply operates from 1.65 V to 5.25 V, enabling direct interface to a wide range of host controllers.

The ADS8688AT is an 8-channel, integrated data acquisition system based on a 16-bit successive approximation (SAR) analog-to-digital converter (ADC), operating at a throughput of up to 500 kSPS. The device features integrated analog front-end circuitry for each input channel with up to ±20-V overvoltage protection, an 8-channel multiplexer with automatic and manual scanning modes, and an integrated 4.096-V reference with low temperature drift.

Operating on a single 5-V analog supply, each input channel can support multiple true bipolar as well as unipolar input ranges. Each input range is software-programmable and independent for each channel, enabling maximum system flexibility. The analog front-end gain is accurately trimmed to ensure high dc precision for all input ranges. The device offers a 1-MΩ constant resistive input impedance for any selected input range, enabling direct sensor connection to the device.

The ADS8688AT offers a simple SPI-compatible serial interface to the digital host and also supports daisy-chaining of multiple devices. The digital supply operates from 1.65 V to 5.25 V, enabling direct interface to a wide range of host controllers.
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* Data sheet ADS8688AT 16-Bit, 500-kSPS, 8-Channel, Single-Supply, SAR ADC With Bipolar Input Ranges datasheet PDF | HTML 13 Jun 2018
Application brief Precision ADCs in Servo Drives (Rev. A) PDF | HTML 29 Oct 2025
Circuit design Input Protection for High-Voltage ADC Circuit with TVS Diode (Rev. A) PDF | HTML 02 May 2023
Application note Circuit for detecting input floating on ADS8681 ADC PDF | HTML 31 Mar 2021

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