Datasheet

PCM5141, PCM5142
www.ti.com SLAS759A –AUGUST 2012–REVISED SEPTEMBER 2012
Audio Data Interface
Audio Serial Interface
The audio interface port is a 3-wire serial port with the signals LRCK (pin 15), BCK (pin 13), and DIN (pin 14).
BCK is the serial audio bit clock, used to clock the serial data present on DIN into the serial shift register of the
audio interface. Serial data is clocked into the PCM514x on the rising edge of BCK. LRCK is the serial audio
left/right word clock.
Table 15. PCM514x Audio Data Formats, Bit Depths and Clock Rates
MAX LRCK
CONTROL MODE FORMAT DATA BITS SCK RATE [x f
S
] BCK RATE [x f
S
]
FREQUENCY [f
S
]
Up to 192kHz 128 – 3072 64, 48, 32
I
2
S/LJ 32, 24, 20, 16
384kHz 64, 128 64, 48, 32
Software Control
Up to 48kHz 128 – 3072 125, 256
(SPI or I
2
S)
TDM 32, 24, 20, 16 96kHz 128 – 512 125, 256
192kHz 128, 192, 256 128
Up to 192kHz 128 – 3072 64, 48, 32
Hardware Control I
2
S/LJ 32, 24, 20, 16
384kHz 64, 128 64, 48, 32
The PCM514x requires the synchronization of LRCK and system clock, but does not need a specific phase
relation between LRCK and system clock.
If the relationship between LRCK and system clock changes more than ±5 SCK, internal operation is initialized
within one sample period and analog outputs are forced to the bipolar zero level until resynchronization between
LRCK and system clock is completed.
If the relationship between LRCK and BCK are invalid more than 4 LRCK periods, internal operation is initialized
within one sample period and analog outputs are forced to the bipolar zero level until resynchronization between
LRCK and BCK is completed.
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