Other Parts Discussed in Thread: OPA4277
Hello,
I am hearing some ringing coming through the INA128 at the low end of the audio spectrum. When my signal is over 5kHz there is no problem at all but when the signal is under 5kHz I am getting some ringing on the output. I have verified by listening to the signal pre-INA128 and post-INA128.
I am using the typical application circuit for Microphone, Hydrophone, etc. shown on page 16 of the datasheet (pictured below). I have a 50k resistor running from each input to ground instead of the 47k resistors listed. My gain resistor is 49.9 Ohms for a calculated gain of ~1000. My source impedance is on the order of 8 Ohms.
Any advice? Do I need to compensate with some capacitance on the input?
Thanks
Application circuit: