AK4145 Datasheet, PDF (11/27 Pages) Asahi Kasei Microsystems – Digital BTSC Stereo Encoder

[AK4145]
■ Audio Serial Interface Format
Data is shifted in via the SDTI pin using BICK and LRCK inputs. In serial control mode (P/S pin = “L”), the DIF0-2 bits
select five serial data modes as shown in Table 5. In parallel control mode (P/S pin = “H”), the DIF pin select two serial
data modes as shown in Table 6. In all modes the serial data is MSB-first, 2’s compliment format and it is latched on the
rising edge of BICK. Mode 2 can be used for 16/20 MSB justified formats by zeroing the unused LSBs.
Mode
0
1
2
3
4
DIF2
Bit
0
0
0
0
1
DIF1
Bit
0
0
1
1
0
DIF0
bit
SDTI Format
BICK
0 16bit LSB Justified
≥32fs
1 20bit LSB Justified
≥40fs
0 24bit MSB Justified
≥48fs
1 16/24bit I²S Compatible
32fs or ≥48fs
0 24bit LSB Justified
≥48fs
Table 5. Audio Data Formats (Serial control mode)
Figure
Figure 1
Figure 2
Figure 3
Figure 4
Figure 2
(default)
Mode
2
3
DIF
pin
SDTI Format
BICK
0 24bit MSB Justified
1 16/24bit I²S Compatible
≥48fs
32fs or ≥48fs
Table 6. Audio Data Formats (Parallel control mode)
Figure
Figure 3
Figure 4
LRCK
BICK
(32fs)
SDTI
Mode 0
BICK
(64fs)
SDTI
Mode 0
01
10 11 12 13 14 15 0 1
15 14
01
6 5 4 3 2 1 0 15 14
14 15 16 17
31 0 1
Don’t care
15 14
15:MSB, 0:LSB
Lch Data
0 Don’t care
10 11 12 13 14 15 0 1
6 5 4 3 2 1 0 15 14
14 15 16 17
31 0 1
15 14
0
Rch Data
Figure 1. Mode 0 Timing
MS0982-E-01
- 11 -
2010/09