AK4534 Datasheet, PDF (21/64 Pages) Asahi Kasei Microsystems – 16Bit CODEC with MIC/HP/SPK-AMP

ASAHI KASEI
[AK4534]
Mode
PS1
PS0
MCKO
0
0
0
256fs
Default
1
0
1
128fs
2
1
0
64fs
3
1
1
32fs
Table 8. MCKO Frequency (EXT Mode, MCKO bit = “1”)
Master Mode (M/S pin = “H”)
Power up
Power down
MCKO pin
MCKO bit = “0” : “L”
MCKO bit = “1” : Output
“L”
BICK pin
BF bit = “0” : 64fs Output
BF bit = “1” : 32fs Output
“L”
LRCK pin Output
“L”
Table 9. Clock Operation at Master Mode (EXT Mode)
Slave Mode (M/S pin = “L”)
Power up
Power down
MCKO pin
MCKO bit = “0” : “L”
MCKO bit = “1” : Output
“L”
BICK pin Input
Fixed to “L” or “H” externally
LRCK pin Input
Fixed to “L” or “H” externally
Table 10. Clock Operation at Slave Mode (EXT Mode)
The S/N of the DAC at low sampling frequencies is worse than at high sampling frequencies due to out-of-band noise.
When the out-of-band noise can be improved by using higher frequency of the master clock. The S/N of the DAC output
through Headphone amp at fs=8kHz is shown in Table 11.
MCLK S/N (fs=8kHz, A-weighted)
256fs
84dB
512fs
88dB
1024fs
88dB
Table 11. Relationship between MCLK and S/N of HP-AMP
n Master Mode/Slave Mode
The M/S pin selects either master or slave modes. M/S pin = “H” selects master mode and “L” selects slave mode. The
AK4534 outputs MCKO, BICK and LRCK in master mode. The AK4534 outputs only MCKO in slave mode, while BICK
and LRCK must be input separately.
MCKO
BICK / LRCK
Slave Mode MCKO = Output
BICK = Input
LRCK = Input
Master Mode MCKO = Output
BICK = Output
LRCK = Output
Table 12. Master mode/Slave mode
MS0133-E-03
- 21 -
2003/5