Other Parts Discussed in Thread: TAS5558, PCM3070, SRC4192
Hello,
unfortunately I still have problems with my TAS5558, first there were some I2C problems (http://e2e.ti.com/support/amplifiers/audio_amplifiers/f/6/t/281531.aspx) and now I2C works but I don't get music on the PWM Output.
MCLK is 12288 MHz, Wordclock is 96 kHz and Bitclock is 6144 MHz. Data is connected to SDIN1 (I also tried all other ports).
I start the device how it's explained in the datasheet:
1. TrimRegister0x12=00(this register is not explained in the datasheet!)
2. Exit Shutdown 0x03 = A0
3. Set Master Volume 0xD9 = 00 00 00 48
Of course I used a 32bit I2C transaction for the Master Volume. I also checked the transaction on a logic analyzer and it's everything correct.
After this the VALID Led turns on and PWM outputs start switching but with no signal. I checked every output, all the same. Just the regular "standby switching".
I saw that the TAS uses a fs of 256 in default, I want to use 128 so I changed it in register 0x00 (default is 0xAC, I tried 0xA4 with no effect)
In the other post with the I2C problems Paul told me to use a 18kOhm for OSRES Pin to get I2C to work. I used 10kOhms (I actually don't have a 18kOhm) but maybe that's the problem in this case?!
Of course I checked the Audio source, it's a 24bit I2S signal from a SRC4192, I also tried it with a Audio Signal out of a pcm3070. MUTE Pin is high.
Thanks very much for your help. I never had so much trouble with a IC before :(
