Other Parts Discussed in Thread: OPA1656
Hello TI-Team,
We have a problem with the noise at the output of our DSP board. We want to ensure that the noise is not coming from our output circuitry by evaluating the performance of used ICs. The output is converted with the DAC PCM5242. The analog audio signal is then amplified with the OPA1656ID operational amplifier. Our question is whether the noise problem is due to incorrect configuration of the DAC or OPA.
Is the low-pass filter at the output of the DAC correctly dimensioned?
Can the resistor R612 and the DC coupling capacitor C615 be removed, e.g. with OUTRP?
Another question is whether an impedance adjustment must be made between the two ICs in order to keep the noise floor as low as possible?
I have attached a schematic page with the DAC and the OPA used.
Thank you for your support!
Best regards
Emanuel Lemnitz