Post Go back to editing

Hello,

I required an high speed ADC with bipolar analog input ranging from -V to +V. I was considering AD9042 but later on it came to my notice that it does not take in bipolar analog input. So, right now I am considering the following ADC's for the same purpose:

I do not have any information yet regarding whether these devices take in bipolar analog input or not. I request you to inform me whether any of these devices fulfills my requirement.

Thanks

Regards

Darshil Patel

Parents
• Hi Darshil,

I agree with what Tony said. Yes, differential input means that the difference of the two input signals determines the ADC differential input amplitude. The differential amplitude is the voltage on one input referenced to the other differential input (not referenced to ground). So, with differential inputs you can have a negative input voltage with both input signals being positive with respect to ground.

It sounds like you are looking to convert a single-ended signal that is from -5V to +5V with respect to ground. The ADCs I am familiar with will have problems applying a voltage that goes more negative than the ground reference.

One possibility is to use an amplifier such as ADA4932 with its supplies connected to +5V and -5V. This could do the single-ended-to-differential conversion (and attenuation, gain <1) so the signal will be compatible with an ADC with differential inputs.

Thanks,

Doug

• Hi Darshil,

I agree with what Tony said. Yes, differential input means that the difference of the two input signals determines the ADC differential input amplitude. The differential amplitude is the voltage on one input referenced to the other differential input (not referenced to ground). So, with differential inputs you can have a negative input voltage with both input signals being positive with respect to ground.

It sounds like you are looking to convert a single-ended signal that is from -5V to +5V with respect to ground. The ADCs I am familiar with will have problems applying a voltage that goes more negative than the ground reference.

One possibility is to use an amplifier such as ADA4932 with its supplies connected to +5V and -5V. This could do the single-ended-to-differential conversion (and attenuation, gain <1) so the signal will be compatible with an ADC with differential inputs.

Thanks,

Doug

Children
No Data