lm49370rl National Semiconductor Corporation, lm49370rl Datasheet - Page 51

• Manufacturer Part Number: lm49370rl
• Description: Audio Sub-system With An Ultra Low Emi, Spread Spectrum, Class D Loudspeaker Amplifier, A Dual-mode Stereo Headphone Amplifier, And A Dedicated Pcm Interface For Bluetooth Transceivers
• Manufacturer: National Semiconductor Corporation

12.34 DIGITAL AUDIO DATA FORMATS
I
used when the ADC is enabled, unless the FORCE_RQ bit is set. If the PCM receiver interface is operated in slave mode the clock
and sync should be enabled at the same time because the PCM receiver uses the first PCM frame to calculate the PCM interface
format. This format can not be changed unless a soft reset is issued. Operating the LM49370 in master mode eliminates the risk
of sample rate mismatch between the data converters and the audio interfaces.
In slave mode, the PCM and I
formats are as followed:
2
S master mode can only be used when the DAC is enabled unless the FORCE_RQ bit is set. PCM Master mode can only be
2
S receivers only record the 1st 16 and 18 bits of the serial words respectively. The I
FIGURE 12. PCM Serial Data Format (16 bit Slave Example)
FIGURE 10. I
FIGURE 11. I
2
2
S Serial Data Format (Default Mode)
S Serial Data Format (Left Justified)
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S and PCM
20191715
201917q8
20191716