Datasheet

NormalMode
LRCK
L
Sub-frame0 Sub-frame1
OneFrame,1/f
S
Sub-frame2 Sub-frame3
R L R L R L R
L
Sub-frame0 Sub-frame1
OneFrame,1/f
S
OneFrame,1/f
S
Sub-frame0 Sub-frame1
R L R L R L R
L
OneFrame OneFrame
1/f
S
1/f
S
1/f
S
1/f
S
OneFrame OneFrame
R L R L R L R
DATA
LRCK
DATA
LRCK
DATA
DoubleSpeedMode
QuadSpeedMode
NormalMode
LRCK
L
Sub-frame0 Sub-frame1
OneFrame,1/f
S
Sub-frame2 Sub-frame3
R L R L R L R
L
Sub-frame0 Sub-frame1
OneFrame,1/f
S
OneFrame,1/f
S
Sub-frame0 Sub-frame1
R L R L R L R
L
OneFrame OneFrame
1/f
S
1/f
S
1/f
S
1/f
S
OneFrame OneFrame
R L R L R L R
DATA
LRCK
DATA
LRCK
DATA
DoubleSpeedMode
QuadSpeedMode
DIGITAL DECIMATION FILTER
PCM4220
SBAS407C – DECEMBER 2006 – REVISED AUGUST 2009 ............................................................................................................................................. www.ti.com
NOTE: Each L or R channel time slot is 32 bits long, with 24-bit data Left-Justified in the time slot. Audio data is MSB first. Sub-frame
assignments for each PCM4220 device are selected by the corresponding SUB0 and SUB1 pin settings.
Figure 42. TDM Data Formats: Slave Mode
NOTE: Each L or R channel time slot is 32 bits long, with 24-bit data Left-Justified in the time slot. Audio data is MSB first. Sub-frame
assignments for each PCM4220 device are selected by the corresponding SUB0 and SUB1 pin settings.
Figure 43. TDM Data Formats: Master Mode
The PCM4220 digital decimation filter is a linear phase, multistage finite impulse response (FIR) design with two
user-selectable filter responses. The decimation filter provides the digital downsampling and low-pass anti-alias
filter functions for the PCM4220.
The Classic filter response is typical of traditional audio data converters, with Figure 24 through Figure 27
detailing the frequency response, and the related specifications given in the Electrical Characteristics table. The
group delay for the Classic filter is 39/f
S
, or 812.5 µ s for f
S
= 48kHz and 406.25 µ s for f
S
= 96kHz. The Classic filter
response is not available for the Quad Speed sampling mode.
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Product Folder Link(s): PCM4220