ADS8688AT - 16-Bit 500kSPS 8-Ch SAR ADC w/ Bipolar Inputs Using 5V Supply, Low-Drift Vref, and Wide Temp Range

The ADS8688AT is an 8-channel, integrated data acquisition system based on a 16-bitsuccessive approximation (SAR) analog-to-digital converter (ADC), operating at a throughput of upto 500 kSPS. The device features integrated analog front-end circuitry for each input channel withup to ±20-V overvoltage protection, an 8-channel multiplexer with automatic and manual scanningmodes, 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 truebipolar as well as unipolar input ranges. Each input range is software-programmable and independentfor each channel, enabling maximum system flexibility. The analog front-end gain is accuratelytrimmed to ensure high dc precision for all input ranges. The device offers a 1-MΩ constantresistive input impedance for any selected input range, enabling direct sensor connection to thedevice.

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

• 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)

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