I cant amplify PGA2311‘s VinL.

Hi Echo,

To help me trouble shoot your issue can you please provide oscilloscope waveforms of the input and output of both channels, CS, SCLK, and SDI?

-Tim Claycomb

Hi Timothy,

Here are waveforms from oscillosoppe.

the signal that I put in

this is the output signal,the yellow one is from right channel,the bule one is from left channel.

channel 1 is CS,channel 2 is SDI,channal is SCLK  that from logic analyzer

Hi Echo,

I do not see anything wrong with the timing of CS, SDI, or SCLK. Would it be possible to also provide data of the SDO pin with CS, SDI, SCLK? This may help us see what the PGA2311 is reading.

Are the left and right inputs the same? If not, what is the input to the left channel.

Lastly can you please provide your schematic?

-Tim Claycomb

Hi Tim,

Thanks for your reply.
here is my schematic

Hi Echo,

Can you please post what the solution to your problem was? This way, if others in the future have a similar problem to yours they can quickly locate a solution.