Hi there - I am looking for a good way to drive a board that takes a differential analog -10-10V signal. I am using a current output DAC. My current plan is to run the current output DAC through a simple transimpedance amp (ie
-Michael
Hi there - I am looking for a good way to drive a board that takes a differential analog -10-10V signal. I am using a current output DAC. My current plan is to run the current output DAC through a simple transimpedance amp (ie
-Michael
Don't google for "analog differential driver", just for "differential driver" or "differential line driver".
There are many differential drivers, from different manufacturers. I can't really pin out just one of them, you'll have to compare datasheets and see which one is good for your circuit. Or, you can build your own differential driver using regular opamps. It's not that complicated.. One opamp does noninverting buffering/amplification for + signal. The other one is connected as inverting opamp, doing the same buffering/amplification for - signal. So, it's symmetrical (enough).
Using reasonably fast opamps, there's no delay that would have any effect. Unless you are using signals which are very fast (like hundreds of MHz).
Does the dac have diff current outputs? What's its part number?
How fast does this need to be?
John
Right, you just need to *know* how to do it...
The standard way of single ended to the differential conversion is using the two identical differential amps. One is inverting the signal, the other is not inverting. This provides for the completely symmetrical configuration. The full differential opamp may be used for that also, however there are not too many opamps of this kind.
You can also find some interesting topologies here:
Although their configurations are not strictly symmetrical.
Vladimir Vassilevsky
DSP and Mixed Signal Design Consultant
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