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Question about AD9642

Question asked by Kazu on Jul 4, 2018
Latest reply on Jul 10, 2018 by J.Harris

Hi,

 

I have some questions about AD9642. Please take care of this case.

 

1): Question about an anti-aliasing filter for 50 ohm differential line.

I'll use AD4930-1 and AD9642, and I'm looking at Figure 47. in AD9642 data sheet.

There is the RC circuit between AD4930-1 and AD9642 and it seems to work as differential signal balance.

Please let me know recommended anti-aliasing filters for this differential line (50 ohm).

 1: AD9642-170, AAF Bandwidth:75MHz  2: AD9642-250, AAF bandwidth: 100MHz

 

2): There are two 0.1uF caps on the VCM line shown in Figure 47.

The VCM line really needs two caps for ADA4930-1 and AD9642?

 

3): What capacitance (decoupling cap) do AVDD and DRVDD pins need?

 

Regards,

Kazu

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