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Differential to single-ended converter

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AsperAstrum

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Hi,

I need a solution for the following problem in the project I'm working in.

I have a linear position measurement sensor that outputs a sinus and a cosinus wave which are both single-ended. This output is connected to an interpolation device that converts these signals to 2 differential RS422 square wave signals (A,A/,B,B/). A DAQ card (NI PCIE6321) is supposed to read these signals through its analog 32bit counter input for position measurement but it requires the signals to be single-ended.

So I need a custom circuit or a device (it'd be better if it's off the shelf) that can convert a differential square wave signal to a single-ended one. It also needs to work fast since our original sinus signals are approx. 100 Hz and we need real time position measuring. I searched through the internet but couldn't find any direct answers to my question. I am fairly new to the subject so I can elaborate if I wasn't clear on certain points. Thank you all who respond in advance.
 

A traditional RS-422 driver puts out a TTL level signal
pair and the true output is usable single-ended. The ones I
designed had each phase built as a single ended driver
and the phase-split was way back in the logic.
 

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