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ADV7611 Crystal design queries

Question asked by ayusman on Jul 21, 2014
Latest reply on Jul 22, 2014 by GuenterL

Dear All,

 

I am designing a custom board with ADV7611 for industrial temperature range. I have a few queries on the same.

 

1. I see that EVM uses a crystal from Golledge which has a  frequency of 28.63636MHz and ESR of 30Ohm. I am not able to use that in my design and thus plan to use ABM8G-28.63636MHZ-18-D2Y-T. It has a ESR of 50ohm. Can anyone confirm if this is fine or I need to change my crystal. How much does this difference in ESR affect the working of ADV7611.

 

2. I see that a 390K resistor is connected in parallel to the crystal. Can anyone tell me why this is done. I didnot find any explanation on the same.

 

Regards

Ayusman

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