AD9277: Is it possible to interface a differential opamp as input?

Hi Jhon,

Thanks for your interest on the AD9277.

Unfortunately, AD9277 only accepts single-ended inputs. You can't connect the Vo- signal to LGx pins.

The maximum Vin depends on the gain you set thru SPI.

Regards,

Mark

Hi Jhon,

Thanks for your interest on the AD9277.

Unfortunately, AD9277 only accepts single-ended inputs. You can't connect the Vo- signal to LGx pins.

The maximum Vin depends on the gain you set thru SPI.

Regards,

Mark

Dear Mark,

Thanks for your reply. But what is AD9277 LNA different to standard differential opamp?

If I do not use the RFB, CFB to set input impedance, and leave LO-x and LOSW-x pins floated, can I connect differential inputs to the LNA of AD9277?

Thanks,

Jhon

Hi Jhon,

You can't do that, the LNA only supports single-ended inputs. The LGx pins should be connected to ground.

Regards,

Mark