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ISO7820LL: 2.5V LVDS isolator interfaced to 1.8V ADC

Yogesha D G
Prodigy 90 points
Part Number: ISO7820LL

Hi,

We are using TI isolator to interface the differential clock signals from FPGA to the ADC as shown in the image.

We have the following two concerns.


1) Please let us know if the LVDS Signal specs mentioned in the image for all the three ICs are compatible with each other.

2) Vcc of ADC is 1.8V whereas Vcc of TI Isolator is 2.5V. Please let us know if this configuration can be implemented for the LVDS specs mentioned in the block diagram.

  • 0
    TI__Mastermind 25200 points

    Hello Yogesha, 

    Thank you for reaching out. 

    1. The ISO7820LL should not have an issue accepting the 1.8V inputs as long as the differential signal is greater than the VIT (50mV). All three devices should be compatible.
    2.  I see no problems with ISO7820LL interfacing with AD9259ABCPZ, however is not a TI part. I would recommend making an E2E thread with a similar TI part (like the QUAD CHANNEL, 14-BIT, ASC) so the proper team can help you select and verify a TI part that is best for the application. 

    Best,
    Andrew