10.1 Layout Guidelines

Figure 55 shows an example layout that is used on the AMC1336-Q1 evaluation module. For best performance, place the smaller 0.1-µF decoupling capacitors (C7 and C9) as close as possible to the AMC1336-Q1 power-supply pins, followed by the additional C1 and C11 capacitors with a minimum value of 1 µF. The resistors and capacitors used for the analog input filter (R1, R2, C4, C5, and C8) are placed next to the decoupling capacitors. Use 1206-size, SMD-type, ceramic decoupling capacitors and route the traces to the AINx pins underneath. Connect the supply voltage sources in a way that allows the supply current to flow through the pads of the decoupling capacitors before powering the device.
Consider use of RC filters on the digital clock and data lines to reduce reflections and slew rate that cause radiated emissions. The AMC1336-Q1 evaluation module offers placeholders for RC filters (termed R8 and C13 in Figure 55) for the CLKIN line, and R7 and C12 for the DOUT line.