We are using the SSM2518 in an MCU design - it is driven via I2S output from an LPC5506 MCU. We are using a wide variety of MCLK speeds and configurations to support many file sample rates, but most are 48kHz 16-bit short audio samples. Our code is set up to un-mute the amplifier, play the audio sample, and then re-mute the amplifier.
We observe a distinct and very audible hissing sound, both while audio is playing, and most importantly after the amplifier has been commanded to soft mute.
The amplifier is configured with the right channel disabled - we only need mono output.
We also have volume link enabled, which feels like it could cause an issue. However, I have tried disabling it and have not noticed any problem.
I have seen another identical question on this forum that had been marked as resolved, but did not offer a solution. Any ideas?