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AD9655 Recommended for New Designs
The AD9655 is a dual, 16-bit, 125 MSPS analog-to-digital converter (ADC) with an on-chip sample-and-hold circuit designed for low cost, low power, small...
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AD9655 Anlog input interface through Transformers

jitendra

on Jul 1, 2021

HI,

I Have some queries regarding AD9655 Evaluation schematics ,Please clarify the below queries.

1. Evaluation schematic inputs connected only Ain+ why?

2. If i am getting signal from Board. using Differential driver i have to use AIN+ and AIN-or i have to convert to Single ended again in my board

3. Please provide schematics for Differential input with transformer coupling.

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UmeshJ
on Jul 1, 2021 6:23 PM
1. that is the schematic we used to test the AD9655 in the lab. our signal generators are single ended and we need a way to convert them to differential.

2. you can remove the transformers and place an additional SMA connector to enable differential connection

3. the same schematic can be used to convert to a fully differential front end.
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jitendra
on Jul 3, 2021 12:24 PM in reply to UmeshJ
i am planning to connect on my boar like below Please suggest if i am wrong

VIN+ Connected to Transformer through 0.1uF

VIN- Connected to other end of Transformer through 0.1uF in the place of AGND

Below attached Schematic Please suggest if i am wrong
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jitendra
on Jul 3, 2021 12:24 PM in reply to UmeshJ
i am planning to connect on my boar like below Please suggest if i am wrong

VIN+ Connected to Transformer through 0.1uF

VIN- Connected to other end of Transformer through 0.1uF in the place of AGND

Below attached Schematic Please suggest if i am wrong
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