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Texas Instruments ADS868xW 16-Bit SAR Analog-to-Digital Converters

Texas Instruments ADS868xW 16-Bit SAR Analog-to-Digital Converters (ADCs) are an integrated data acquisition system family based on a successive approximation (SAR) analog-to-digital converter (ADC) topology. The devices feature a high-precision, high-speed SAR ADC and an integrated differential analog front-end (AFE) input driver circuit. The ADS868xW includes an overvoltage protection circuit of up to ±20V and an on-chip 4.096V reference with extremely low-temperature drift.

The Texas Instruments ADS868xW devices operate on a single 5V analog supply but support true bipolar 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 multiSPI digital interface is backward-compatible to the traditional SPI protocol. The devices offer a high resistive input impedance (≥ 1MΩ) irrespective of the selected input range. Additionally, configurable features simplify the interface to various host controllers.

Features

  • 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
  • 1.65V to 5V I/O supply analog supply (5V)
  • Constant resistive input impedance ≥ 1MΩ
  • 450kHz input bandwidth
  • Input overvoltage protection of 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 a high, low threshold
  • multiSPI™ interface with daisy-chain
  • -40°C to +125°C extended industrial temperature range

Applications

  • Analog input modules
  • Semiconductor tests
  • Servo drive control modules

Additional Resources

Functional Block Diagram

Block Diagram - Texas Instruments ADS868xW 16-Bit SAR Analog-to-Digital Converters

Related Development Tool

Texas Instruments ADS8681WEVM-PDK Evaluation Module (EVM)

Evaluates the performance of the ADS8681W, an integrated data acquisition system based on a SAR ADC.

Learn Moreabout Texas Instruments ADS8681WEVM-PDK Evaluation Module (EVM) View Productsrelated to Texas Instruments ADS8681WEVM-PDK Evaluation Module (EVM)
Published: 2024-08-23 | Updated: 2025-07-10