Other Parts Discussed in Thread: TPA3116D2, TAS5414C
I am designing a system that requires 3 of the TAS5751M parts configured in PBTL configuration so there is about 50W for each channel driving a 2 ohm load from a supply power range of 12 to 24 vdc.
Perhaps there might be a better part for this application. I don't need the equalizer or some of the other items in this part, however it is so cheap for the power level that I don't mind using it and nulling out any of the signal flow path items that we don't need for the application. A 50W mono, I2S, I2C, wide variation supply part was my search criteria.
My Questions:
1) Is there a "best" or "recommended" method to drive the I2C on these such that I can give them 3 unique IDs?
I know the ADR/FAULT pin can help config. two parts, but what about 3 parts? Ideas/suggestions being the Cortex-M has one I2C channel.
I don't want to have to put one of the amps. on bit banging pins from the CPU if at all possible.
I can spare a CPU pin to maybe hold one or two parts in reset while initializing them to unique ID's?
2) My application will have either 12vdc or 24vdc battery power. I have already swept through this range with the TPA3116D2 part and found that it appears to handle this with out a noticeable change in output volume levels. Great! However is this ok to assume the parts can simply handle that variation in supply voltage and maintain output level? I was thinking to have my Cortex-M monitor the supply and make any adjustments via. I2C to the ampl. chips to maintain output level if I have to do it that way? Any ideas/thoughts on this?
3) Does TI have any sample I2C initialization source code (in C) to setup these parts in an embedded design, a library or the like?
4) I am intending to drive all 3 ampl. IC's with one I2S signal that is branched to all three ampl. parts. Will the three ampl. parts be in phase/sync at their outputs or could there be some phase error between the signals one would see at the outputs (speakers). This is a six speaker acoustic wave warning device for marine use and to have the resonance in the audio in the chamber the drivers must all be in phase.
Thanks for ideas/suggestions/recommendations ahead of time,
MY