Part Number:TAS5755M
I have a PCB design (mine) that uses an Analog Devices SSM3582 with I2S input, the client wants me to replace this Amp with the TAS5755M so I bought the TAS5755M Evaluation PCB and have it running well from an analog input.
My PCB design has 2 sources of I2S data, a TI TLV320ADC ADC and a Cypress CYBT-343026 (Ex Broadcom WICED module), I use a 74LVC157APW to select/switch between one source or the other. The issue is that the Cypress module doesn't have a MCLK output and the TAS5755M seems to need one. The signals I have are as follows
| TLV320ADC | CYBT343026 | SSM3582 | TAS5755M | Notes |
| MCLK | MCLK | TheTLV320ADC has a 12MHz Xtal feeding into MCLK | ||
| BCLK | I2S_PCM_CLK | BCLK | SCLK | This is the main clock at approx 1.4 MHz |
| WCLK | I2S_WS_PCM | FSYNC | LRCLK | This is the L/R or Frame Clock which changes polarity every 16 bits of the BCLK |
| DOUT | I2S_PCM_OUT | SDATA | SDIN | Digital Audio Data |
I read the datasheet for the TAS5755M and it seemed to indicate that is could work with no MCLK input but when I remove the link for the MCLK signal from the Eval PCB setup, I get no sound. Can the TAS5755M run with no MCLK? I can see that I could give it the same 12 MHz MCLK that's feeding the TLV320ADC but then that clock would have no relationship to the data streaming from the Cypress module when that was selected as the I2S signal source.