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OPA1632 - A single ended analog, or conversion circuit?

Brandon Kinman69139
Prodigy 10 points
Other Parts Discussed in Thread: OPA1632, THS4011, THS4031

Hello,

I'm working on a data acquisition project, and my pre-amplification and signal conditioning stages are based around the OPA1632.

I'm needing to convert the differential output from the 1632 to a single ended output. I figure there are two ways to do this.

 

1)Find an appropriate single ended amplifier:

    Requirements:
           -Cost: ~$5, same as the OPA1632
           -Speed: must have same slew rate and gain bandwidth margin (180mhz) as OPA1632
           -Supply: must operate -15V/+15V

    Issue:
           -Similar amplifiers that I have found do not meet all of the above criteria... Particulalry in terms of price.

2)Design a differential to single-ended converter using an OPA1632

     Issue: Is it alright to just design an 2x gain stage using an OPA1632, and disregard the inverted output? I will be driving a 50 ohm transmission line with just the non-inverting output?

 

Thanks in advance!

  • 0
    TI__Expert 4115 points

    Brandon,

    Approach #1 is the cleanest.

    I would recommend the THS4031 used in difference amp circuit. It uses similar internal architecture, except being single ended output, and is manufactured in the same process. It also has similar noise performance. The TI web price is about $3 @ 100u. The THS4011 is also in same process; has higher BW and SR, but on down side also higher noise.

    Regards,

    Jim Karki

    TI High Speed Op Amps