AD9674 TGC Gain input driver

Hi,

For AD9674, we need a differential driver for Gain+-, in datasheet figure38, there is reference design, but this design need an input from -1.6V to 1.6V, except a DAC, we need an OP amplifier to convert to bipolar output. and for this amplifier, need a negative power supply.

So I want to know is, is there a more simplified driver? Googled and found Linear has a design(dn454fa), can we use this design? for this design, Can we use op like AD8138? Is there any DAC recommend for this design? Thanks!

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  • Thanks Hugh, sorry for the late respond.

    I prefer below solution:

    cn0180(ad8657 change to ADA4896-2) + ADA4938

    Because I can not understand fully for other choices. It is high risk for me.

    For "The AD5429 has 2 channels of current output, you can set different codes to output two complementary output voltages (one is -1.6V to 0 and the other is 0 to -1.6V)", do you mean use one AD5429 chip to output complementary outputs? but it still need a negative power supply to output -1.6V.

Reply
  • Thanks Hugh, sorry for the late respond.

    I prefer below solution:

    cn0180(ad8657 change to ADA4896-2) + ADA4938

    Because I can not understand fully for other choices. It is high risk for me.

    For "The AD5429 has 2 channels of current output, you can set different codes to output two complementary output voltages (one is -1.6V to 0 and the other is 0 to -1.6V)", do you mean use one AD5429 chip to output complementary outputs? but it still need a negative power supply to output -1.6V.

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