Hi Team,
The customer is using LMP7721. The attachment is his schematic. R10 is 10M. R9 and R11 is 0 ohm. C18 is unconnected.
The APD device can provide the current for LMP7721. The IN- pin input current that the APD device provides is about tens nA to hundreds nA.
When the IN- pin input current is changed, the output voltage for LMP7721 is always colsed to +2.5V.
What is the reasons? How to solve the issue?
Best Wishes,
Mickey Zhang
Asia Customer Support Center
Texas Instruments
