PCM AUDIO INTERFACE
The three-wire digital audio interface for PCM3000/3001 is
on LRCIN (Pin 16), BCKIN (Pin 17), DIN (Pin 18), and
DOUT (Pin 19). The PCM3000/3001 can operate with
seven different data formats. For the PCM3000, these for-
mats are selected through PROGRAM REGISTER 3 in the
software mode. For PCM3001, data formats are selected by
FORMAT 0: FMT[2:0] = “000”
DAC: 16-Bit, MSB-First, Right-Justified
LRCIN
BCKIN
DIN
16
1
2
MSB
ADC: 16-Bit, MSB-First, Left-Justified
LRCIN
BCKIN
DOUT
1
2
MSB
3
14 15 16
LSB
1
2
MSB
3
14 15 16
LSB
1
L–ch
R–ch
3
14 15 16
LSB
1
2
MSB
3
14 15 16
LSB
L–ch
R–ch
pin-strapping the three format pins. Figures 2, 3 and 4
illustrate audio data input/output format and timing.
PCM3000/3001 can accept 32, 48, or 64 bit clocks (BCKIN)
in one clock of LRCIN. Only formats 0, 2, and 6 can be
selected when 32 bit clocks/LRCIN are applied.
FORMAT 1: FMT[2:0] = “001”
DAC: 18-Bit, MSB-First, Right-Justified
LRCIN
BCKIN
DIN
18
1
2
MSB
ADC: 18-Bit, MSB-First, Left-Justified
LRCIN
BCKIN
DOUT
1
2
MSB
3
16 17 18
LSB
1
2
MSB
3
16 17 18
LSB
1
L–ch
R–ch
3
16 17 18
LSB
1
2
MSB
3
16 17 18
LSB
L–ch
R–ch
FORMAT 2: FMT[2:0] = “010”
DAC: 16-Bit, MSB-First, Right-Justified
LRCIN
BCIN
DIN
16
1
2
MSB
ADC: 16-Bit, MSB-First, Right-Justified
LRCIN
BCIN
DOUT
16
1
2
MSB
3
14 15 16
LSB
1
2
MSB
3
14 15 16
LSB
L–ch
R–ch
3
14 15 16
LSB
1
2
MSB
3
14 15 16
LSB
L–ch
R–ch
FIGURE 2. Audio Data Input/Output Format.
®
PCM3000/3001
10
BURR-BROWN [ BURR-BROWN CORPORATION ]
