Hi,
I have test the audio amplifier PGA2320 like this:
I adjust the PGA to 31.5dB over SPI and I put a Frequency generator at the input of the PGA.
After that, I adjust the frequency generator to a sine wave 1KHz and the ampitude I adjust that the output of the PGA have 10Vpp.
Now I change only the frequency of the frequency generator to 1/10/20/40Khz.
The Unity-Gain Bandwith is 1MHz according to the datasheet, page 2 "electrical characteristics".
So I guess that the output aplitude of the PGA should be equal 10Vpp over this frequency area, but the output of the PGA depends of the frequency.
1KHz=10Vpp/10KHz=9,2Vpp/20KHz=7,4Vpp/40KHz=5,7Vpp
Why do I have a behavior like this?
Thanks and Best, Daniel