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ADV7125 Vref Pin

Question asked by daisu on Nov 26, 2014
Latest reply on Nov 26, 2014 by daisu

Hello all,

 

Our customer evaluates ADV7125.

VREF pin is connected to 5V through AC coupling as the description of datasheet .

http://www.analog.com/jp/audiovideo-products/video-encoders/adv7125/products/product.html#product-recommendations

 

5V waveform is  unstable  by another factor.

So Vref is undatabe by its factor.

Analog RGB output signal is unsatable and  interference pattern is displayed on monitor.

 

Pleae let me know your advice about below 1 to 3  to modify  unstability of RGB output signal

1: Change capacitance of VREF pin
2: Connect condencer for VREF pin  to not  5V but GND
3: Open VREF pin

 

If there is any notice about above 1 to 3, pleaes let me know your advice.

Regards,

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