AD9912 and Analog Devices' line of Buffers

Hello,

I am using the AD9912 output (DAC_out) to drive a 50 ohm load. I was looking for Analog Devices buffers that can output up to 400MHz with a signal amplitude of up to 1 Vpp.

I was able to find both a diff-to-diff buffer (ADA4932) and a single-ended to single-ended (AD8007) that can go up to 400 MHz for small signals (~100 mV pp) but do not for large signals (2 Vpp).

I was wondering if there is a graph showing frequency response for various signal sizes to see if I could use the above buffers for a 1 Vpp input signal. If not, are there other AD parts that can meet the above requirements?

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  • hi tsmith7,

    The ADA4932 and AD8007 have operating frequencies lower than 400MHz at large signal (2Vpp). Since you need 1Vpp and it was not specified in the data sheet, there's no guarantee that the frequency at 1Vpp will have exactly or more than 400MHz. Most of the datasheets indicate 100mVpp and 2Vpp for -3dB small signal and large signal bandwidth. We can offer you other devices that are more suitable for your applications.
    For differential amplifier, you may used the parts below:

    ADA4930 - operates at 937MHz for large signal, single supply operation at 3.3V or 5V.

    ADA4938 - operates at 800MHz for large signal

    For single ended to single ended buffer:

    ADA4857 - operates at 600MHz for large signal

    AD8000 - operates at 650MHz for large signal

    regards,

    ahbie

Reply
  • hi tsmith7,

    The ADA4932 and AD8007 have operating frequencies lower than 400MHz at large signal (2Vpp). Since you need 1Vpp and it was not specified in the data sheet, there's no guarantee that the frequency at 1Vpp will have exactly or more than 400MHz. Most of the datasheets indicate 100mVpp and 2Vpp for -3dB small signal and large signal bandwidth. We can offer you other devices that are more suitable for your applications.
    For differential amplifier, you may used the parts below:

    ADA4930 - operates at 937MHz for large signal, single supply operation at 3.3V or 5V.

    ADA4938 - operates at 800MHz for large signal

    For single ended to single ended buffer:

    ADA4857 - operates at 600MHz for large signal

    AD8000 - operates at 650MHz for large signal

    regards,

    ahbie

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