www.ti.com

NormalMode

LRCK

L

Sub-frame0 Sub-frame1

OneFrame,1/f

S

Sub-frame2 Sub-frame3

R

L

R

L

R

L

R

L

Sub-frame0 Sub-frame1

OneFrame,1/f

S

OneFrame,1/f

S

Sub-frame0 Sub-frame1

R

L

R

L

R

L

R

L

OneFrame OneFrame

1/f

S

1/f

S

1/f

S

1/f

S

OneFrame OneFrame

R

L

R

L

R

L

R

DATA

LRCK

DATA

LRCK

DATA

DoubleSpeedMode

QuadSpeedMode

NormalMode

LRCK

L

Sub-frame0 Sub-frame1

OneFrame,1/f

S

Sub-frame2 Sub-frame3

R

L

R

L

R

L

R

L

Sub-frame0 Sub-frame1

OneFrame,1/f

S

OneFrame,1/f

S

Sub-frame0 Sub-frame1

R

L

R

L

R

L

R

L

OneFrame OneFrame

1/f

S

1/f

S

1/f

S

1/f

S

OneFrame OneFrame

R

L

R

L

R

L

R

DATA

LRCK

DATA

LRCK

DATA

DoubleSpeedMode

QuadSpeedMode

DIGITAL DECIMATION FILTER

PCM4220

SBAS407A – DECEMBER 2006 – REVISED MAY 2007

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

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

filter response is not available for the Quad Speed sampling mode.

22

Submit Documentation Feedback