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Why do I need input OpAmps at AD7768?

Category: Hardware
Product Number: AD7768


i have a question concerning the opams at AD7768. If I have an sensor with smal output impedance can I skip the opamp section shown in the picture below?

Why is it needed? Mainly I saw the Opamp Section in schematics of differential ADCs.

Best regards

  • Hi  ,

    The ADA4945-1 is a fully differential ADC driver that provides signal conditioning. It is suited for single supply-operation and is the recommended fully differential amplifier to drive the AD7768/AD7768-4 or the AD7768-1.

    May I know what is your input type, input range. source impedance, or sensor used? Also, can you provide the target performance and specifications of your system such as accuracy or resolution? Does it required AC performance? May I know also the target throughput so that I can provide you a more concrete solution.



  • I use an acceleration sensor with output signal 0,5-4,5V or +/- 4V output with low output impedance. I also will add an 4-20mA input which is selectable via jumper. What do you mean by AD performance?Impedance input is maximum 1000Hz. Resolution of 16 bit is enough.

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