All power supply pins should be bypassed to ground with a low-ESR ceramic bypass capacitor. The typical recommended bypass capacitance has a value of 0.1 µF and is ceramic with a X7R or NP0 dielectric.
A 4.7 µF capacitor is recommended between the REF_CMP pin and the AGND4 pin. A minimum capacitor value of 470 nF is required to ensure stability.
A high-quality ceramic capacitor, type NP0 or X7R, is recommended because of the optimal performance of the capacitor across temperature and very-low dissipation factor.
The digital and analog sections should have proper placement with respect to the digital pins and analog pins of the AMC7834 device (see Figure 110). The separation of analog and digital blocks allows for better design and practice as it ensures less coupling into neighboring blocks and minimizes the interaction between analog and digital return currents.
10.2 Layout Example
Figure 109. AMC7834 Layout Example
Figure 110. AMC7834 Example Board Layout — Component Placement