Hello,
I'm currently using the TAS5614LA in a design with all 3 mode pins set low, so configured as 2 x BTL with differential input PWM. At a basic level, the device works, but recently when I've been looking for greater precision, I've found that there is a cross coupling effect from channel AB to channel CD.
See video attached below, which shows the two sides of the output PWM on channel CD (red and green), and one side of the output PWM on channel AB. Channel AB is driven with a very slow drive waveform (artificially slow, so that it can be seen) and the PWM of the blue signal can be seen to vary as intended. However, there is also an undesired variation in the PWM of the red signal (OUT_C). The oscilloscope is triggered on the green signal (OUT_D) which is stable.
I don't see any mention of cross-coupling in the datasheet. Is this behaviour expected, and if so, is there anything I can do to get rid of it?
Thanks,
Gordon.