16-bit high-precision ADC

The PCB layout design separates

the switching power supply, analog circuits, and digital circuits,
clearly distinguishing between power ground, analog ground, and digital ground. Each ground is connected at a single point (analog ground and digital ground are connected to power ground via vias, with no pressure difference between the ground planes) to reduce crosstalk.
Analog input ports and digital output ports are isolated by maximum distance and located on opposite sides of the PCB.
Noise interference is fully considered through ground partitioning, RC oscillation absorption, separate analog and digital LDOs, and LC decoupling. The main components for

 
 
power supply noise level are: ADS8681 (16-bit resolution, 1 MSa/s, multiSPI™ communication (compatible with traditional SPI)); and an XL6008 main power supply. The BOOST switching power supply is divided into two paths: an analog power supply (TPS7A4901) and a digital power supply (AMS1117) . This design aims to minimize the interference of digital switching noise on the analog components while ensuring convenient power supply. The analog power supply uses the ultra-low noise TPS7A4901 to reduce analog noise and ensure the true accuracy of the ADC. The digital power supply uses the AMS1117 (low cost and meets requirements), with LC filtering at the input port to decouple high-frequency noise and prevent it from coupling to the analog components through the LDO. Module Description