Texas Instruments recommends a 4-layer PCB with a solid ground plane, and to keep the analog and digital signals separate. Use short, direct traces for the analog inputs and outputs, and avoid running digital signals near the analog signals. Additionally, use a low-ESR capacitor for the AVDD pin and a 0.1uF capacitor for the REF pin.
For differential input mode, connect the positive input signal to the IN+ pin and the negative input signal to the IN- pin. For pseudo-differential input mode, connect the input signal to the IN+ pin and the reference voltage (e.g., GND or a fixed voltage) to the IN- pin. Ensure the input common-mode voltage is within the specified range (0.5V to 2.5V).
The optimal clock frequency for the ADS8327IBRSAT is between 1MHz and 4MHz. A higher clock frequency increases the conversion rate but also increases power consumption. For example, at 1MHz, the conversion rate is approximately 100kSPS, while at 4MHz, it's around 400kSPS. Choose a clock frequency that balances conversion rate and power consumption for your specific application.
The ADS8327IBRSAT has an internal 2.5V reference voltage, which can be used for most applications. However, if a more accurate or adjustable reference voltage is required, an external reference voltage can be connected to the REF pin. Ensure the external reference voltage is within the specified range (2.0V to 2.7V) and has a low noise and low drift characteristic.
When selecting an external analog input filter for the ADS8327IBRSAT, consider the filter's cutoff frequency, attenuation, and phase response. The filter should have a cutoff frequency above the Nyquist frequency (half the sampling rate) and provide sufficient attenuation of high-frequency noise. Additionally, ensure the filter's phase response does not affect the signal's phase and amplitude.
ADS8327IBRSAT datasheet
by Texas Instruments
