Datasheet

PCM3008
SLAS332 – APRIL 2001
9
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PCM audio interface
Digital audio data is interfaced to the PCM3008 on LRCK (pin 10), BCK (pin 12), DIN (pin 9), and DOUT (pin
8). PCM3008 can accept 16-bit standard format, right-justified 16 bit for DAC and left-justified 16 bit for ADC.
PCM3008 accepts 3 types of BCK and LRCK combination, with 64, 48 or 32 clocks of BCK in one clock of LRCK.
The following figures illustrate audio data input/output format and timing.
Ready
1
1024 1025
1
1024 1025
ZERO
t
RSTB
1024 SYSCK 1024 SYSCK
After
Ready
After
Ready
Reset Reset
Reset
Release
Reset
Release
t
ADCDLY1
t
ADCDLY1
t
DACDLY1
t
DACDLY1
t
DACDLY1
V
COM
(0.5 V
DD
)
2.1 V
0 V
V
CC
SYSCK
PDAD
PDDA
Internal
Reset
ADC
DOUT
DAC
V
O
SYMBOL
DEFINITION MIN TYP MAX UNIT
t
RSTB
PDAD = LOW and PDDA = LOW pulse width 40 ns
t
ADCDLY1
Initial delay time 2240/f
s
s
t
DACDLY1
Fade in, fade out time 2080/f
s
s
Figure 3. Power-On Reset Timing
LRCK
BCK
DIN
MSB LSB MSB LSB
BCK
LRCK
Right-Channel
DOUT
MSB LSB MSB LSB
16 1 2 3 14 15 16 1 2 3 14 15 16
14 15 1612314 15 16123
1
DAC: 16-Bit, MSB-First, Right-Justified
ADC: 16-Bit, MSB-First, Left-Justified
Right-Channel
Left-Channel
Left-Channel
Figure 4. Audio Data Input/Output Format