[AK4104]
MS0642-E-01 2010/09
- 11 -
■ Audio Interface Format
Data is shifted in via the SDTI pin using BICK and LRCK inputs. The DIF1-0 bits as shown in
Table 2 can select four
serial data modes. In all modes the serial data is MSB-first, 2’s compliment format and is latched on the rising edge of
BICK. Mode 3 can be used for 16bit I
2
S Compatible format by zeroing the unused LSBs at BICK ≥ 48fs or BICK = 32fs.
Mode DIF1 DIF0 SDTI Format BICK Figure
0 0 0 16bit, LSB justified
≥ 32fs
Figure 10
1 0 1 24bit, LSB justified
≥ 48fs
Figure 11
2 1 0 24bit, MSB justified
≥ 48fs
Figure 12
3 1 1 16/24bit, I
2
S Compatible
≥ 48fs or 32fs
Figure 13
Table 2. Audio Interface Format
LRCK
BICK(32fs)
0 1102 3 9 1112131415 0 123 10109 1112131415
SDTI(i)
Don't Care 1 0 15 14 13 21015 14 13 12 12Don't Care
SDTI-15:MSB, 0:LSB
SDTI(i)
15 14 13 7654321015 14 13 1576543210
BICK(64fs)
0 1182 3 19 20 31 0 1 2 3 1018 19 20 3117 17
Lch Data Rch Data
Figure 10. Mode 0 Timing
LRCK
BICK(64fs)
0 1 22431012 10312489 89
SDTI(i)
Don't Care 0 8 10
23:MSB, 0:LSB
Lch Data Rch Data
23 8 Don't Care 231
Figure 11. Mode 1 Timing
LRCK
BICK(64fs)
0 1 220212431012 102220 21 312422 23 23
SDTI(i)
Don't Care0 0
23:MSB, 0:LSB
Lch Data Rch Data
Don't Care
432123 22 23 22 231234
Figure 12. Mode 2 Timing
