A good layout and routing practice is to keep the analog and digital grounds separate, use a solid ground plane, and keep the analog input traces away from the digital traces. Additionally, use a low-ESR capacitor for the AVDD pin and a 0.1uF capacitor for the DVDD pin.
To optimize the ADC's performance, consider the following: choose the correct gain setting, adjust the sampling rate, and select the appropriate clock source. Additionally, ensure proper PCB layout, use a low-noise power supply, and consider using a filter or averaging to reduce noise.
The recommended power-up sequence is to power up the AVDD pin first, followed by the DVDD pin. This ensures that the analog circuitry is powered up before the digital circuitry.
The ADS7885SDBVT has a conversion time of approximately 1.5us. To handle the latency, consider using a FIFO or a buffer to store the converted data, and ensure that your system can handle the conversion time by using a suitable clock frequency and interrupt handling.
The ADS7885SDBVT can be interfaced with a microcontroller using a SPI or I2C interface. Ensure that the microcontroller's clock frequency is compatible with the ADC's clock frequency, and use a suitable communication protocol to read the converted data.
ADS7885SDBVT datasheet
by Texas Instruments
