ADS8665

www.ti.com ADS8661, ADS8665 SBAS780B – DECEMBER 2016A– DRESV8IS6E6D1,MAARDCSH82606251 SBAS780B – DECEMBER 2016 – REVISED MARCH 2021 ADS866x 12-Bit, High-Speed, Single-Supply, SAR ADC Data Acquisition System With Programmable, Bipolar Input Ranges 1 Features 12-bit ADC with integrated analog front-end High speed: – ADS8661: 1.25 MSPS – ADS8665: 500 kSPS Software programmable input ranges: – Bipolar ranges: ±12.288 V, ±10.24 V, ±6.144 V, ±5.12 V, and ±2.56 V – Unipolar ranges: 0 V–12.288 V, 0 V–10.24 V, 0 V–6.144 V, and 0 V–5.12 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 Excellent performance: – DNL: ±0.1 LSB; INL: ±0.15 LSB – SNR: 74 dB; THD: –102 dB ALARM → high, low threshold multiSPI™ interface with daisy-chain Extended industrial temperature range: –40°C to +125°C 2 Applications Analog input modules Mixed modules (AI, AO, DI, DO) Data acquisition (DAQ) Trackside signaling and control 3 Description The ADS8661 and ADS8665 belong to a family of integrated data acquisition system based on a successive approximation (SAR) analog-to-digital converter (ADC). The devices feature a high-speed, high-precision SAR ADC, integrated analog front-end (AFE) input driver circuit, overvoltage protection circuit up to ±20 V, and an on-chip 4.096-V reference with extremely low temperature drift. The devices operate on a single 5...