LTC2497 Conversion

Question

Hi 
 I am using LTC2497. I am trying to get the ADC conversion reading, could anyone explain how does the conversion of 2's compliment to decimal works on this ADC? I tried many times and it does not seem to be working. 
 Thank you.

ghoover · Accepted Answer

After the conversion, it is necessary to send the read address which the LTC2497 should ACK and then read out the data. It sounds like the ADC is not acknowledging the read address you are providing. Can you send an oscilloscope photo of the data transfer?

ghoover · Answer

My assumptions were correct. So the output code you are seeing is off by about 6.6%. Your schematic doesn't show what is driving the ADC inputs. COM is connected directly to ground. If the channel you are driving does not have a similar low impedance path to ground, the mismatch in impedance could be causing the error. Please include in your schematic how the inputs are being driven. Is your circuit built on a PCB with a solid ground plane? Are your bypass capacitors as close as possible to the pins being bypassed? What is the 5V_REF source?

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LTC2497 Conversion

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