Good day. We have some issues with programmable gain amplifier PGA113. The circuit block of this IC starts to generate noise as the PCB takes shock or vibration. Amplitude of noise depends on impact force and on some level have its maximum from AVDD (+5V) to GND.
VOCM is +2.5 Volts. JMP2 not used. мкФ - uF, Ом - Ohm. VOCM buffered by AD8616ARZ. Also we've tryied to use Vref from MSP430F2619SPM instead of VOCM.
Shock waveform at 2V/10 ms div.