AK4137EQ Datasheet, PDF (41/65 Pages) Asahi Kasei Microsystems – 32bit SRC with PCM/DSD conversion

[AK4137]
Cascade Connection in TDM Mode
The AK4137 supports cascading of up to four devices (8 channels data) in a daisy chain configuration in
TDM mode. In this mode, SDTO pin of device #1 is connected to OMCLK (TDMIN) pin of device #2.
The SDTO pin of device #2 can output 4 channels of TDM data multiplexed with 2-chnnel of TDM data
from device #1 and 2-channel of TDM data from device #2. Figure 34 shows a connection example of a
daisy chain.
AK4137 #1
LRCK
BICK
OMCLK (TDMIN)
SDTO
GND
48kHz
256fs
AK4137 #2
LRCK
BICK
OMCLK (TDMIN)
SDTO
(TDMIN of
AK4127 #3)
LRCK
Figure 34.
256 BICK
BICK(256fs)
#1 SDTO(o)
31 30 1 0 31 30 1 0
31 30
= #2 TDMIN(i) ^{L #1}
R #1
32 BICK 32 BICK
#2 SDTO(o)
31 30 1 0 31 30 1 0 31 30 1 0 31 30 1 0
31 30
= #3 TDMIN(i) ^{L #2}
R #2
L #1
R #1
32 BICK 32 BICK 32 BICK 32 BICK
#3 SDTO(o)
31 30 1 0 31 30 1 0 31 30 1 0 31 30 1 0 31 30 1 0 31 30 1 0
31 30
= #4 TDMIN(i) ^{L #3}
R #3
L #2
R #2
L #1
R #1
32 BICK 32 BICK 32 BICK 32 BICK 32 BICK 32 BICK
#4 SDTO(o)
31 30 1 0 31 30 1 0 31 30 1 0 31 30 1 0 31 30 1 0 31 30 1 0 31 30 1 0 31 30 1 0 31 30
L #4
32 BICK
R #4
32 BICK
L #3
32 BICK
R #3
32 BICK
L #2
32 BICK
R #2
32 BICK
L #1
32 BICK
R #1
32 BICK
Figure 35.
Rev. 0.2
- 41 -
2014/06