Part Number:LMP7721
Hi,
The LMP7721 eval kit is set to a gain of 33, V+ is 2.5V and V- is -2.5V. Vref is ground. Non-inverting default mode. When a 1mV square signal is connected from a signal generator, I get the required output gain. But when I connect a Piezo crystal the Output is railed to +2.5V. Only when I excite the crystal which should produce a good enough signal, I see some small negative bumps in the oscilloscope. Please let me know what changes are required to get the amplifier working for a Piezo crystal.
Regards
Manju