AnsweredAssumed Answered

six analog device AD5422, connected in daisychain mode giving current difference at output.

Question asked by ShivamSeth on Nov 14, 2014
Latest reply on Dec 4, 2014 by DRice

Hi,

 

I have six analog device AD5422, linked with each other in Daisy chain mode. I have configured all six DAC channels for 0-20mA output range. Communication mode is through SPI.

 

Now when i send the same digital counts to all six DAC channels, 1st and 2nd channels are giving me correct output current as per counts but remaining channels have differences in output current.

 

 

example:

If we have send counts for 10mA, my observed readings are

Channel 1                                                            

SW-CH1(mA)Observer-CH1
109.82

 

Channel 2                                                                  

SW-CH2(mA)Observer-CH2
109.79

 

channel 3

SW-CH3(mA)Observer-CH3
1010.4

 

channel 4

SW-CH4(mA)Observer-CH4
1010.32

 

channel 5

SW-CH5(mA)Observer-CH5
1010.41

 

channel 6

SW-CH6(mA)Observer-CH6
1012.76

Outcomes