AK5397 Datasheet, PDF (25/44 Pages) Asahi Kasei Microsystems – 32-Bit Stereo Premium ADC

[AK5397]
■ Audio Interface Format
12 types of audio data interface can be selected by the TDM1-0, MSN and DIF pins as shown in Table 5.
The audio data format can be selected by the DIF pin. In all formats the serial data is MSB-first, 2's
complement format. The SDTO1/2 is clocked out on the falling edge of BICK.
In normal mode, Mode 0-1 are the slave mode, and Mode 2-3 are the master mode. BICK frequency is
shown in Table 2.
In TDM256 mode, BICK must be fixed to 256fs. In the slave mode, “H” time and “L” time of LRCK must be
1/256fs at least. In the master mode, “H” time (“L” time at I²S mode) of LRCK is 1/8fs typically. TDM256
mode supports only Normal Speed.
In TDM128 mode, BICK must be fixed to 128fs. In the slave mode, “H” time and “L” time of LRCK must be
1/128fs at least. In the master mode, “H” time (“L” time at I²S mode) of LRCK is 1/4fs typically. TDM128
mode supports Normal/Double/Quad Speed.
TDM1
pin
L
L
H
H
TDM0
pin
L
H
H
L
MSN DIF
pin pin
Mode
SDTO
LRCK
I/O
L
L0
32bit, MSB justified H/L I
(Slave)
H
H
L
1
2
Normal
32bit, I²S Compatible
32bit, MSB justified
L/H
H/L
I
O
(Master) H 3
32bit, I²S Compatible L/H O
L
L4
32bit, MSB justified
I
(Slave)
H
H
L
5
6
TDM256
32bit, I²S Compatible
32bit, MSB justified


I
O
(Master) H 7
32bit, I²S Compatible  O
L
L8
32bit, MSB justified
I
(Slave)
H
H
L
9
10
TDM128
32bit, I²S Compatible
32bit, MSB justified


I
O
(Master) H 11
32bit, I²S Compatible  O
N/A N/A 12 N/A
N/A
N/A N/A
Table 5. Audio Interface Format (N/A: Not available)
BICK
I/O
I
(Table 2)
I
O
O
256fs I
256fs I
256fs O
256fs O
128fs I
128fs I
128fs O
128fs O
N/A N/A
Sampling Speed Audio Interface Format The maximum number of channels
Normal
2ch
Normal Speed
TDM256
8ch
TDM128
4ch
Normal
2ch
Double Speed
TDM256
N/A
TDM128
4ch
Normal
2ch
Quad Speed
TDM256
N/A
TDM128
4ch
Normal
2ch
Octal Speed
TDM256
N/A
TDM128
N/A
Hex Speed
Normal
TDM256
2ch
(SDTO1: Lch, SDTO2: Rch)
N/A
TDM128
N/A
Table 6. Relationship between Sampling Speed and Audio Interface Format (N/A: Not available)
014011535-E-00
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2014/11