TLV320AIC3104: the HP outs creat a 'pop' noise when powering up DAC

Joy,

The register write sequence is important for this.
First, depending on your application, The HPOUTS have the option of weakly biasing the outputs to VCOM when the HPOUTs are powered down. If you have the opportunity to set this bit early, the HPOUTs can be brought up to the VCOM slowly, and by the time you actually turn on the HPOUT it has already reached VCOM.

next, register 42 controls the pop reduction. I'd say start with driver power on time of 100ms and ramp time of 2ms. and adjust as needed.
w 30 2a 68
w 30 28 80 < sets VCOM to 1.65 (for AVDD=3.3) This register also has the volume control soft stepping. (change soft stepping to on step per two sample periods if you are unhappy with the mute/volume control


then make sure HPdrivers are configured for AC Coupling mode.
w 30 0E 80 # HP drivers are AC coupled.


w 30 33 03 # power up HPLOUT

wait until register 94 shows that HPLOUT is fully powered up.

F 30 5E 'xxxxx1xx' # This line just waits until the register 5E has a 1 in the D2 position

power up the DAC
w 30 25 c0

disable mute on the LEFT DAC
w 30 2b 00

IF using the DAC_L1 path, disable the mute on the mixing amplifier here. IF using the DAC_L2 path you do not need to.
w 30 2f 80

finally Unmute the HPLOUT:
w 30 33 0B


best regards,
-Steve wilson