Hi,
I've a prototype circuit interfacing a DIR9001 (spdif) into 2x PCM1794A's which go into 12x NE5534's and output as balanced audio L & R.
So far I've verified by scope that I2S is coming out the DIR9001, all lines are good. Soldering has been verified under microscope, no problem there. Despite this I'm unable to get output from either PCM1794A. I've verified both DIR9001 & PCM1794A are in 24 bit I2S mode. The mute pin on both is grounded. 3.3v & 5v lines are perfect. I can't see any output on scope going to the first op-amps.
Anything I'm missing?
I've a prototype circuit interfacing a DIR9001 (spdif) into 2x PCM1794A's which go into 12x NE5534's and output as balanced audio L & R.
So far I've verified by scope that I2S is coming out the DIR9001, all lines are good. Soldering has been verified under microscope, no problem there. Despite this I'm unable to get output from either PCM1794A. I've verified both DIR9001 & PCM1794A are in 24 bit I2S mode. The mute pin on both is grounded. 3.3v & 5v lines are perfect. I can't see any output on scope going to the first op-amps.
Anything I'm missing?
Attachments
Your schematic shows that Mute is connected between the two but not to ground. Mute on the 1794A is logic high for mute on, and logic low for mute off. Could it be that this line needs to be pulled low?