A 4-layer PCB with a solid ground plane and a separate analog ground plane is recommended. Keep analog and digital signals separate, and use a common mode filter to reduce noise.
The analog input impedance should be matched to the source impedance to minimize signal reflections. A 1 kΩ to 10 kΩ input impedance is recommended, depending on the signal source.
A low-jitter clock source is recommended, with a clock frequency of 2x to 4x the sampling frequency. A clock signal with a 50% duty cycle is recommended for optimal performance.
The digital output data should be captured using a FIFO or a DDR memory interface. The data should be processed in real-time to minimize latency and ensure accurate data capture.
A multi-point decoupling scheme with 0.1 μF and 10 μF capacitors is recommended to reduce power supply noise and ensure stable operation.
ADS42JB49IRGC25 datasheet
by Texas Instruments
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