Filter
Top Products
Intel
®
31154 133 MHz PCI Bridge Design Guide Design Guide 57
Power Considerations
Power Considerations 8
8.1 Analog Power Pins
The analog voltage pins S_VCCA and P_VCCA require a low-pass filter. This is implemented by
connecting the P_VCCA and S_VCCA pins to a 10 Ω series resistor and 0.01 µF and 4.7 µF (low-
ESR) capacitors in parallel going to ground. The opposite end of the 10 Ω resistor is connected to
the 1.3 V supply. This arrangement is shown in Figure 18 and Figure 19.
When implementing these circuits, use the following filter circuit layout and component
recommendations:
1. Low-ESR, polymerized organic capacitors are recommended for 4.7 µF.
2. The 0.01 µF capacitor must be a X5R, X7R, or COG.
3. The capacitors must be placed as close as possible to associated pins to minimize inductance.
4. The connections from the P_VCCA and S_VCCA must be kept as short as possible.
Figure 18. P_VCCA Filter
Figure 19. S_VCCA Filter