We are working on a 2.1 channel audio amp with TAS5508C. (It is a long story on why we use an 8-channel controller for 2.1 design.) There are several audio sources: I2S out from LM3S9B96 and an BT module.
LM3S9B96 provides its own master MCLK and I2S data so we are fine here. However, the BT module is a master I2S but it only provides SCK, WS (Word Select) & SD (Serial Data). It doesn't provide any MCLK signal. BTW, the BT module uses 48K hz sample rate.
Here are my questions:
1. Is there any way to interface this BT module directly to TAS5508C?
2. If that is an option, I am thinking to use BT I2S as input to LM3S9B96 and let LM3S9B96 output the audio data to its I2S output port along with MCLK. It seems to be a possible solution but we need to write some code in LM3S9B96. Has anyone had this successfully? Or does anyone have any comment/suggestion?
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Did you get this sorted out?
Audio Applications Engineering Manager
Dallas, TX USA
Yes, kind of. Since we use TLV320AIC3206 in the same design, we just feed the bit clock of I2S to AIC3206 and configure AIC3206 to use this as the clock source to generate appropriate MCLK output.
This may not be the most elegant or cost effective solution, but it gets the job done.
Thanks for letting us know! Others may benefit from your experience!
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