I am student from germany and I have to do a projekt.
I want to realize it with your amplifier ADA4870.
I have some questions to you about this device:
- How can I realize the floating-state of the ON-pin? Is there a special IC for that job?
I would it do with two optocouplers which can switch between -18V for LOW and -14.7V HIGH state or float if booth are off.
- How can I measure the output-voltage of the TFL-pin?
I want measure it with an operational amplifier.
I saw that the output voltage sink down if I connect it with a voltage divider of about 12kOhm. I change the value to 1MOhm. Now it is OK. But how much current can give the TFL-pin?
- Is there an application note where I can find these information or circuits?
I am looking forward to hearing from you soon.
Thank you for any help!!