Richardson RFPD Linear ICs - Evaluation Board EVAL-CN0194-SDPZ

The AD7685 is a 16-bit, charge redistribution successive approximation (SAR) analog-to-digital converter (ADC) that operates from a single VDD power supply from 2.3 V to 5.5 V. It contains a low power, high speed, 16-bit sampling ADC with no missing codes, no pipeline delay, an internal conversion clock, and a versatile serial interface port. The ADC also contains a low noise, wide bandwidth, short aperture delay, track-and-hold circuit. On the CNV rising edge, it samples an analog input (IN+) between 0 V to VREF with respect to the ground sense (IN−). The reference voltage, VREF, is applied externally and is set from 0.5 V to VDD. The circuit of Figure 1 uses a 4.5 V reference voltage.