ADF4108 loop filter design: using OP27

We are trying to use the schematic provided in UG-160 (ADF4108) eval board user manual.

Can we replace the OP184, which uses a single rail 15V supply, with an OP27, which uses a dual rail +/-15V supply.

Can we avoid using the -15V supply rail and ground it, same as the OP184?

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  • 0
    •  Analog Employees 
    on Dec 18, 2018 11:03 AM over 1 year ago

    Hi Guruditya, 

    The OP27 is not a rail-to-rail input and output part, unlike the OP184. With a single 15V supply, you will get very little input and output range from the amplifier, and this is probably not the best choice for this application. 

    You can take a look at the ADA4625-1. It is especially suited for loop filter applications and has a very thorough discussion on page 22 of the datasheet. 

    Let me know if this suits your purposes. 

    Thanks, 

    Kris

Reply
  • 0
    •  Analog Employees 
    on Dec 18, 2018 11:03 AM over 1 year ago

    Hi Guruditya, 

    The OP27 is not a rail-to-rail input and output part, unlike the OP184. With a single 15V supply, you will get very little input and output range from the amplifier, and this is probably not the best choice for this application. 

    You can take a look at the ADA4625-1. It is especially suited for loop filter applications and has a very thorough discussion on page 22 of the datasheet. 

    Let me know if this suits your purposes. 

    Thanks, 

    Kris

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