Two AD5116 + One SSM2306

Question

Hi, 
 I am planning to use ADI push button in my volume control design. 
 I will use SSM2306 (Stereo Audio Amplifier) in this project, and I am wondering if I can use 2 AD5116 to do the volume control? Each AD5116 will be connected with Left or Right channel audio signal. 
 I also wonder if I can use a same combination of push buttons to control both AD5116 at the same time? 
 Is this solution workable? 
 I attach a simple circuit which I would like to design for my audio volume control, kindly advice me if that is workable.

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musach · Answer

Hi cklooi, 
 Quick feedback, 
 Use an opmap to buffer the AD5116 output, the SSM2306 input impedance is not high enough to consider negligible the effect. 
 the caps in the amplifier input acts as high pass filter, add an external low pass filter to attenuate the noise at higher frequencies ( <22kHz). 
 Regards, 
 Miguel

musach · Answer

Hi cklooi, 
 Few clarifications, 
 You need to add a buffer between W pin and the SSM input pin to guarantee high impedance... 
 Otherwise, you will have the RWB resistance in parallel with the input impedance in the SSM2306. 
 I cannot see the image you refereed before but I imagine that the buffer in the B terminal is to bias correctly the AC input signal and improve the THD performance. 
 Regards, 
 Miguel