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Beginner with AD7192

Question asked by Killertechno on Jan 25, 2016
Latest reply on Jan 31, 2016 by JellenieR

Hi guys, I'm selecting suitable ADC for my application.

I need to sample 3 segnals at 100 or 200 SPS.

All signals are 2,5 ±2V but (if possible) I would like set ADC fullscale also for 2,5 ±1V and 2,5 ±0,5V, so I selected AD7192 even if not simultaneous on all channels.

 

If I've correctly understood, I can set AD7012 as bipolar mode (AVDD=5V), then apply to AINCOM pin 2,5V as reference.

Now I connect AIN+ to my signals.

AIN- connected where?

Now I can use 2,0V as reference voltage (Vref+), so I should have AIN range from 0,5 to 4,5 Volt using GAIN=1.

Is this correct?

 

In this way I should also set ADC for fullscale ±1V and ±0,5V using GAIN=2 and GAIN=4, but I've seen discussion here gains 2 and 4 don't meet specifications @Verf 2,5V, but if using Vref 2V, should I still avoid these gains?

Thanks.

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