ADS8638: Unused analog input pin(s)

Hello Joshua,

Thanks for your query on E2E. Unused analog input pins are recommended to be connected to the ground on your circuit board.

We also have other similar ADCs that support the features as below, also have excellent performance, 14/16/18-bit pin-pin compatible ADCs are available as well.

http://www.ti.com/product/ads8668

• 12-Bit ADCs with Integrated Analog Front-End
• 4-, 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
• On-Chip, 4.096-V Reference with Low Drift

Please let us know if you have any more questions, thanks.

Best regards

Dale