Hi, I am using 8-channel 4051 multiplexer,the o/p of this is connected to CS5532(24 bit sigma delta A/D converter). when only a single channel is selected and converted by the adc it works properly. when more than 1 channel is selected(sequentially ch1-ch2-ch1-..)the effect of 1 signal change is reflected on the other channel o/p as well and vice versa. To avoid this as per the application note i am already rejecting the first five conversions to flush out the residues of previous channel,but this does not solve the problem. please help me with your ideas /suggestions to understand/solve this problem. sujit
I had till this point tested the complete application for a single channel and it worked perfectly but the multiplexing part didn't work. So if you were only sampling a single channel, signal changes in the other three channels had no effect on the one channel you were sampling ? Can you suggest any other A/D converter which can be used in this application(with internal mux or with compatible external mux). a 16-bit ADC might also be sufficent. Have a look at Analog Devices' ADuC8xx series.