Hello Everyone!
This is my first post and I want to thank you in advance for your help! I am a firmware engineer not so expert in electronics design.
I am trying to develop an audio application using an Atmel SAM4S Xplained Pro board and its microcontroller DAC output.
In the proto board I designed, the DAC output is connected to a second order low pass filter implemented with a Sallen-Key opamp configuration. The opamp used is a OPA344PA rail to rail single supply. Then I remove the DC component with a 10uF capacitor and connect the output to an RCA input of a car audio power amplifier. When I set the gain of the power amplifier to high value, the sound is very bad with high distortion.
This not happens if I directly connect the DAC output directly to the amplifier (using the 10uF capacitor only) and removing the opamp filter.
My question is: the OPA344PA is not able to drive the RCA input of the amplifier?
Many Thanks for your replies!
This is my first post and I want to thank you in advance for your help! I am a firmware engineer not so expert in electronics design.
I am trying to develop an audio application using an Atmel SAM4S Xplained Pro board and its microcontroller DAC output.
In the proto board I designed, the DAC output is connected to a second order low pass filter implemented with a Sallen-Key opamp configuration. The opamp used is a OPA344PA rail to rail single supply. Then I remove the DC component with a 10uF capacitor and connect the output to an RCA input of a car audio power amplifier. When I set the gain of the power amplifier to high value, the sound is very bad with high distortion.
This not happens if I directly connect the DAC output directly to the amplifier (using the 10uF capacitor only) and removing the opamp filter.
My question is: the OPA344PA is not able to drive the RCA input of the amplifier?
Many Thanks for your replies!