JAJSN15 December 2023 ADS9227
ADVMIX
The ADS922x is a 16-bit, 20-MSPS/ch, dual-channel, simultaneous-sampling, analog-to-digital converter (ADC). The ADS922x integrates a high-impedance buffer at the ADC inputs, voltage reference, reference buffer, and common-mode voltage output buffer. The ADS9228 supports unipolar differential analog input signals. The buffer at the ADC inputs is optimized for low-distortion and low-power operation.
For DC level shifting of the analog input signals, the device has a common-mode voltage output buffer. The common-mode voltage is derived from the output of the integrated reference buffer. When a conversion is initiated, the differential input between the (AINAP – AINAM) and (AINBP – AINBM) pins is sampled. The ADS922x uses a clock input on the SMPL_CLKP pin to initiate conversions.
The ADS922x consumes only 141 mW/ch of power when operating at 10 MSPS/ch, which includes the power dissipation of the buffer at the ADC inputs. The serial LVDS (SLVDS) digital interface simplifies board layout, timing, firmware, and supports full throughput at lower clock speeds.