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ADS1292ECG-FE: Test signal with a sine wave

Kimi Izzo
Prodigy 30 points
Part Number: ADS1292ECG-FE
Other Parts Discussed in Thread: ADS1292

Hi there, 

We are trying to evaluate where the ADS1292 chip is adequate for our design requirements. On the evaluation board, ive connected a BNC cable from a function generator to pins 1 and 2 on the DB9 connector for a sine wave input. I have changed the default settings besides the gain to 12 (with a 20mV signal going in). I was expecting to get a sinewave type signal on the software display , however i am just getting noise. 

Should i actually be using both in-amp inputs on the chip? I understand that theres some vector math going on. How do you recommend going about this? 

Thanks!

  • 0
    TI__Genius 11550 points

    Hi Kimi,

    Thanks for the post. 

    You can either connect the sinewave input to the INxP and INxN differentially or single-ended. Please refer to the analog input section in the datasheet for each configuration (Section 8.3.3). It is crucial that you provide the correct common-mode voltage to the input for proper operation. The ADS1292ECF-FE EVM Channel 1 input is ac-couple input, so you can directly provide the differential sinewave signal to ELA and ERA pin. Channel 2 is a DC-couple input with a low-pass filter, so you need to give the sinewave the proper common-mode voltage to the ELL and ERA pin.

    Thanks

    -TC