AnsweredAssumed Answered

AD7172 digital&analog ground connecting

Question asked by winio on Nov 25, 2015
Latest reply on Nov 27, 2015 by winio

Dear Analog,

I want to build ECG (electrocardiograph) circuit using your ADC AD7172. It has separate power inputs for analog circuit (AVCC, AGND) and for digital (SPI communication) circuit (DVCC, DGND). I am planning to use two completely separate power sources (Li Ion 18650 batteries) for analog (ADC & signal amplifiers) and digital (ADC & microcontroller & Bluetooth) circuits.

-----> QUESTION:

Do I need to connect the ground circuits of analog and digital circuits? I do not want to connect it due to high noises in digital circuit.

Please response me asap, so I can make myself proper PCB and start prototyping.