The recommended power-on sequence is to apply VCC first, followed by AVCC, and then the analog input signal. This ensures proper operation and prevents damage to the device.
To optimize the layout, keep the analog and digital grounds separate, use a solid ground plane, and keep the analog input traces short and away from digital signals. Also, use a bypass capacitor between VCC and GND, and a decoupling capacitor between AVCC and GND.
The maximum sampling rate for the ADS8325 is 250 kSPS. However, the actual sampling rate may be limited by the system's clock frequency and the device's settling time.
The ADS8325 outputs 16-bit data in two's complement format. The most significant bit (MSB) is the sign bit, and the remaining 15 bits represent the magnitude of the signal. The output data can be processed using a microcontroller or a digital signal processor.
The REFOUT pin provides a buffered reference voltage output that can be used as a reference for other devices in the system. The voltage level is 2.5 V, and the output current is limited to 10 mA.
ADS8325IBDGKT datasheet
by Texas Instruments
