Recently, I use the PGA309 for my application. And I use the microcontroller to control the PGA309 through IIC .And I can read/write the PGA309 register successfully.But the Vout is still wrong. This makes me carzy!!! Here is my step:
1、Tied the TEST PIN to a microcontroller IO port, and before the registers' configuration I pull down the test pin.
2、 After the configuration set the test pin is high and enable the Vout.
The circuit diagram refer to the User‘s guide F3-5. The signal is 0.9125V but my Vout is just 25mV. I don't kown what is wrong with it.
so I ask for help here.