Using Analog Devices AD7193 4-channel sigma-delta ADC, I am getting a 5-20mV reading as soon as I connect a jumper cable to differential inputs AIN1 – AIN2 (the other end of the jumper cable is open/in the air). Without connecting any cable the reading falls to zero!
(I am using Digilent PmodAD5 board. Attached board schematic and AD7193 datasheet).
Need quick advice on properly making a reading.
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Hi, Have you configured in proper way the CONFIGURATION REGISTER of the AD7193?It looks the inputs can be also configured in pseudo differential way. Cheers Ugo Fabrizi
What you are doing by adding an open ended cable is effectively placing an antenna in the circuit. To get an accurate measurement the differential input requires a minimum source current.