ADS8691

www.ti.com ADS8691, ADS8695, ADS8699 SBAS777B – DECAEMDBSE8R629011,6A– DRESV8IS6E9D5,MAARDCSH82609291 SBAS777B – DECEMBER 2016 – REVISED MARCH 2021 ADS869x 18-Bit, High-Speed, Single-Supply, SAR ADC Data Acquisition System With Programmable, Bipolar Input Ranges 1 Features 18-bit ADC with integrated analog front-end High speed: – ADS8691: 1 MSPS – ADS8695: 500 kSPS – ADS8699: 100 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: ±0.6 LSB; INL: ±1.75 LSB – SNR: 92.5 dB; THD: –110 dB ALARM → high, low threshold multiSPI™ interface with daisy-chain Extended industrial temperature range: –40°C to +125°C 2 Applications Analog input modules Data acquisition (DAQ) Semiconductor tests LCD tests 3 Description The ADS8691, ADS8695, and ADS8699 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 o...