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www.pericom.com

07/08/15

PI3VST01

HPD signal Generator for VGA

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Application Schematics

In order to ensure accurate color balance, gain and frequency response are matched between the R, G, and B channels using:

• 4.7 Ohm resistors in series with the R and G lanes,

• 8.2 pF capacitors to ground from the R and G lanes, and

• a 2 pF capacitor to ground on the B lane.

To pass the VESA VSIS specification, many VGA DACs require series inductors to reduce overshoot and undershoot.

A 47 kOhm resistor is used as a pullup for the open-drain HPD_OUT signal from the PI3VST01 to the VGA DAC control.

4.7 uF capacitors should be used to bypass both VDD5 and VDD3.

The schematic below illustrates the recommended design for the 150//75 case.

15-0090