AKM AK4534, Manual

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ASAHI KASEI [AK4537]
MS0202-E-04 2005/04
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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
„ 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
AK4537 outputs MCKO, BICK and LRCK in master mode. The AK4537 outputs only MCKO in slave mode, while
BICK and LRCK must be input separately.
Mode 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
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