Single pole signal acquisition with differential ADC: AD7768 & AD8476

Hi there,

We're hoping to acquire a 0 - 10 V signal using the evaluation boards for the AD7768 & AD8476.  Please see the attached schematic.  I'm interested in answering the questions under the `Remaining' heading in the notes section of the schematic.

Any comments or suggestions are greatly appreciated.

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  • 0
    •  Analog Employees 
    on Nov 4, 2016 1:53 AM

    Hi,

       The two should have a common ground. The VCOM on the AD7768 is an common mode output from the AD7768 and the default value is 2.5V. This can be use to bias the input to the AD7768. But based from your schematic, you have used the AD7768 reference  connected on the VOCM to biased the AD8476 output. The GND1 to 4 of AD8476 are all connected ground pins. This can be connected to the AD7768 ground pins to have a common ground connection

    Regards,

    Jonathan

Reply
  • 0
    •  Analog Employees 
    on Nov 4, 2016 1:53 AM

    Hi,

       The two should have a common ground. The VCOM on the AD7768 is an common mode output from the AD7768 and the default value is 2.5V. This can be use to bias the input to the AD7768. But based from your schematic, you have used the AD7768 reference  connected on the VOCM to biased the AD8476 output. The GND1 to 4 of AD8476 are all connected ground pins. This can be connected to the AD7768 ground pins to have a common ground connection

    Regards,

    Jonathan

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