AnsweredAssumed Answered

Power supply problem about AD8557

Question asked by hpkamen on Nov 6, 2015
Latest reply on Nov 9, 2015 by Emman.A

i am suing AD8557, having some issues showing below,

could you please help clarify it.

Questions are as follows:


1, the input signal frequency: 50mV,20kHz;

2. the data says the power supply should be 2.7~5.5V , but why some Web site says we can use +-2.5V? And the data also shows some figures with +-2.5V power supply


3, if i use 5V single power supply, when put the input signal, there is no output wave;


4, If i use +-2.5V power and want to get a output signal ,the input signal must  bias voltage to  0.5V


5, if i use +2.5V, i could not control the gain, and it always shows gain=8

the measured waveform and digital signals and schematic pictures shown below, please help me see where is the problem? Thank you