Figure 12-2 is an example layout of the ADS1262 and ADS1263, requiring a minimum of three PCB layers. The example circuit is shown for a single analog supply (5 V) connection and an external crystal oscillator. In this example, an inner layer is dedicated to the ground plane and the outer layers are used for signal and power traces. If a four-layer PCB is used, dedicate the additional inner layers to route power traces. The ADC orientation is shown left to right to minimize crossover of the analog and digital signal traces. The PCB is partitioned with analog signals routed from the left, digital signals routed to the lower-right, and power routed from the upper-right. Analog supply bypass capacitors are placed opposite to the ADC on the bottom layer to allow the reference and PGA output capacitors to be placed closer to the ADC.