Texas Instruments recommends a 4-layer PCB with a solid ground plane, and placing the ADC close to the analog signal sources. Decoupling capacitors should be placed as close as possible to the power pins, and the analog input traces should be kept short and away from digital signals.
Optimizing the ADC's performance requires understanding the application's requirements and adjusting the ADC's settings accordingly. This includes selecting the correct gain, offset, and sampling rate, as well as optimizing the analog input signal conditioning and filtering.
The ADS7809UE4's performance is affected by temperature, with changes in offset, gain, and noise floor. The datasheet provides temperature-related specifications, and engineers should consider these when designing their system. Temperature compensation and calibration may be necessary for high-accuracy applications.
To minimize EMI and RFI, engineers should use proper shielding, grounding, and layout techniques. The ADS7809UE4 has a high-frequency noise filter, but additional filtering may be necessary depending on the application. A low-pass filter or a ferrite bead can be used to filter out high-frequency noise.
The recommended power-up sequence is to power up the analog supply (AVDD) first, followed by the digital supply (DVDD). This ensures that the ADC's internal biasing and references are properly established before the digital interface is enabled.
ADS7809UE4 datasheet
by Texas Instruments
