AK4584_01 Datasheet, PDF (32/53 Pages) Asahi Kasei Microsystems – 24Bit 96kHz Audio CODEC with DIT/DIR

ASAHI KASEI
[AK4584]
„ Master Mode and Slave Mode
The M/S pin selects between master and slave modes. M/S pin = “H” is master mode, M/S pin = “L” is slave mode. In
master mode, MCKO, BICK and LRCK are output. In slave mode, only MCKO is output from the AK4584 and dividing
MCKO externally provides BICK and LRCK.
MCKO1/2
BICK, LRCK
Slave Mode
MCKO1 = Output
MCKO2 = Output
BICK = Input
LRCK = Input
Master Mode
MCKO1 = Output
MCKO2 = Output
BICK = Output
LRCK = Output
Table 17. Master mode/Slave mode
„ Relationship Clock operation and Power down
When the AK4584 is powered down, the XTALE pin controls the master clock output. The DMCK pin disables the
MCKO1 output.
PDN pin M/S pin XTALE pin CM1-0 bit
L
L
H
L
H
Default
Fixed to
L
“01”
H
MCKO1/2
MCKO1 = L
MCKO2 = L
MCKO1 = Output¹⁾
MCKO2 = Output¹⁾
MCKO1 = L
MCKO2 = L
MCKO1 = Output¹⁾
MCKO2 = Output¹⁾
H
L
Don’t Care Available
MCKO1 = Output²⁾
MCKO2 = Output²⁾
H
Table 18. Clock Operation
BICK, LRCK DIR, DIT, CODEC
BICK = Input
LRCK = Input
Power Down
BICK = L
LRCK = L
Power Down
BICK = Input
LRCK = Input
BICK = Output
LRCK = Output
Normal Operation
Note 1) : Since the DIR is powered down, a X’tal oscillator or the external clock can be selected for the clock source.
Note 2) : CM1-0 bits select the clock source. When changing between modes, there is a possibility
that the master clock output (MCKO) stops momentarily.
Note 3) : When PDN pin = “L”, XTI pin is fixed to “L” when XTALE pin = “L” and the external clock is not AC coupled.
„ Digital High Pass Filter
The ADC has a digital high-pass filter for DC offset cancellation. The cut-off frequency of the HPF is 0.9Hz at fs =
44.1kHz and also scales with sampling rate (fs).
MS0118-E-00
- 32 -
2001/11