Convert 11µApp encoder to 1Vpp signals

[interflexo]

How can I convert 11µApp sinusoidal differential encoder output signals to 1Vpp sinusoidal differential drive input signals?

I thank in adance all your cooperation.

[Al_The_Man]

Are these Heidenhain encoders? This sounds like two of the standard signals used by them.
They use the opamp RC4157 to interface to the 11µa type.
Did you need the 1vpp or did you want to go to 5v TTL square wave?
Al.

[interflexo]

Yes. The purpose is to interface an Heidenhain ROD280 angular encoder (18000 Lines, +/- 2.5” precision) with Delta Tau hardware - analogue 1Vpp interface (with 4096x internal interpolation).

Heidenhain is abandoning de 11µA interface for 1Vpp but I have this 3500USD, refurbished angular encoder ready to use in a current project.

I also have two adapter connectors 1 VPP/11 μAPP for converting the 1 VPP signals to 11 μAPP, Heidenhain Part #364914-01. I think these do just the oposite of what I really need. But they were sold to me by an Heidenhain dealer to do 11 μApp / 1 Vpp convertion.

Any light on this subject?

[Al_The_Man]

I presume you need this degree of accuracy that the angular encoder offers?
If you have been supplied the wrong part by Heidenhain, I would contact the dealer again, these units are not cheap.
I would look into an opamp method of conversion, it should be relatively cheap and easy with descrete IC's.
Al.

[interflexo]

Yes the application requires this degree of accuracy. It's a retroffit, these encoders are one of the few parts I didn't change. I will talk with the Heidenhain dealer today but I am anticipating their lack of solution for the problem. The converters costed less than 100USD each. Of course I will send them back if they are useless for this project.

[pastera]

You could use a simple transimpedance amp but will run into issues as temps change.

If I understand you correctly, the encoder has 18000 lines and you will be interpolating for a total of 73728000 PPR? That's a lot of resolution.

Aaron

[interflexo]

Correctly understood pastera. This encoder is used in the turntable center of a peripheral grinding machine.

[FAGORBOY]

There is ready to use adapter, SA-C-P , sold by FAGOR, cost no more than a dish of steak.
check fagor web site, fagorautomation.com and call for service...

[hansdie]

Heidenhain also has a ready to use adapter for 11uApp to 1Vpp, the Id-nr is 313119-01, if you still need it.