Datasheet

REV. 0
AD1955
–15–
1/f
S
NOTES
1. DSP MODE DOES NOT IDENTIFY CHANNEL.
2. LRCLK NORMALLY OPERATES AT
f
S
EXCEPT FOR DSP MODE, WHICH IS 2  f
S
.
3. BCLK FREQUENCY IS NORMALLY 64  LRCLK BUT MAY BE OPERATED IN BURST MODE.
LRCLK
BCLK
SDATA
LRCLK
BCLK
SDATA
LRCLK
BCLK
SDATA
LRCLK
BCLK
SDATA
LEFT CHANNEL
LEFT CHANNEL
LEFT CHANNEL
RIGHT CHANNEL
RIGHT CHANNEL
RIGHT CHANNEL
I
2
S MODE –16 TO 24 BITS PER CHANNEL
RIGHT-JUSTIFIED MODE – SELECT NUMBER OF BITS PER CHANNEL
LEFT-JUSTIFIED MODE – 16 TO 24 BITS PER CHANNEL
DSP MODE – 16 TO 24 BITS PER CHANNEL
MSB
MSB
MSB
MSB
MSB
MSB
MSB
MSB
LSB
LSB
LSB
LSB
LSB
LSB
LSB
Figure 1. Supported Serial Data Formats
t
DLS
BCLK
L/RCLK
SDATA
LEFT-JUSTIFIED
MODE
SDATA
RIGHT-JUSTIFIED
MODE
LSB
SDATA
I
2
S-JUSTIFIED
MODE
t
DBH
t
DBP
t
DBL
t
DDS
MSB
MSB-1
t
DDH
t
DDS
MSB
t
DDH
t
DDS
t
DDS
t
DDH
t
DDH
MSB
8-BIT CLOCKS
(24-BIT DATA)
12-BIT CLOCKS
(20-BIT DATA)
16-BIT CLOCKS
(16-BIT DATA)
Figure 2. Serial Data Port Timing