AK7750 Datasheet, PDF (46/77 Pages) Asahi Kasei Microsystems – Audio DSP with Built-in Hands-Free Phone Features

[ASAHI KASEI]
[AK7750]
(6) Audio Data Interface
Serial Audio Data pins, SDIN1, SDIN2, SDIN3, SDIN4, SDIN5A, SDOUT1, SDOUT2, SDOUT3, SDOUT4A
interface with external systems using LRCLK and BITCLK.
Proper control register settings are required. Please refer to the Total Block Diagram and the Control
Register Setting section.
Data Format is in 2’s complement with MSB first.
Supported Input and Output Formats are AKM’s standard format plus I2S compatible mode. In this mode,
interface of all input and output audio data pins are also I2S compatible.
The default setting is MSB-justified 24 bit format, but by properly setting the control register CONT0
DIF1(D3), DIF0 (D2), other formats such as LSB-justified 24-bit, LSB-justified 20-bit and LSB-justified 16-
bit are also supported (note : CONT0 DIFS (D4) = 0 ). However, SDIN1, SDIN2, SDIN3, SDIN4 and
SDIN5A must all be set to the same format, and cannot be independently set to support different formats.
Outputs SDOUT1, SDOUT2, SDOUT3 and SDOUT4A are in MSB-justified, fixed-24 bit data.
1) Standard Input Format ( DIF[2] = 0 : default value )
a) DIF mode 0 ( DIF[2:0] = 0h : default value )
LRCLK
BITCLK
31 30 29 28 27
SDIN1 ∼ 5A _{M 22 21 20 19}
Left ch
10 9 8 7 6 5 4 3 2 1 0 31 30 29 28 27
21L
M 22 21 20 19
M: MSB, L: LSB
Right ch
10 9 8 7 6 5 4 3 2 1 0
21L
When MSB-justified 20-bit data is input to SDIN1, 2, 3, 4A, fill 4 zeros (“0”) in sequence, starting at the LSB
of each data.
b) DIF mode 1,2,3
SDIN1, 2, 3, 4, 5A
SDIN1, 2, 3, 4, 5A
SDIN1, 2, 3, 4, 5A
mode 1: (DIF[2:0] = 1h
mode 2: (DIF[2:0] = 2h
mode 3: (DIF[2:0] = 3h
LSB-justified 24 bit)
LSB-justified 20 bit)
LSB-justified 16 bit)
LRCLK
Left ch
Right ch
BITCLK
31 30
23 22 21 20 19 18 17 16 15 14
1 0 31 30
23 22 21 20 19 18 17 16 15 14
10
SDIN1∼5A
DIF mode 1 ^{Don’t care M 22 21 20 19 18 17 16 15 14}
1 L Don’t care M 22 21 20 19 18 17 16 15 14
1L
SDIN1∼5A
DIF mode 2 ^{Don’t care}
M 18 17 16 15 14
1 L Don’t care
M 18 17 16 15 14
1L
SDIN1∼5A
DIF mode 3 ^{Don’t care}
M 14
1 L Don’t care
M: MSB, LSB: LSB
M 14
1L
[MS0296-E-00]
46
2005/03