AK4613 Datasheet, PDF (31/69 Pages) Asahi Kasei Microsystems – 4/12-Channel Audio CODEC

[AK4613]
■ De-emphasis Filter
The AK4613 has a digital de-emphasis filter (tc=50/15µs) by an IIR filter. The de-emphasis filter supports only Normal
Speed Mode. This filter corresponds to three sampling frequencies (32kHz, 44.1kHz, 48kHz). De-emphasis of each DAC
can be set individually by registers, DAC1(SDTI1), DAC2(SDTI2), DAC3(SDTI3), DAC4(SDTI4), DAC5(SDTI5),
DAC6(SDTI6).
Mode
0
1
2
3
Sampling Speed Mode
Normal Speed Mode
Normal Speed Mode
Normal Speed Mode
Normal Speed Mode
DEM11
(DEM61-21)
0
0
1
1
DEM10
(DEM60-20)
0
1
0
1
DEM
44.1kHz
OFF
48kHz
32kHz
(default)
Table 8. De-emphasis control
■ Digital High Pass Filter
The ADC has a digital high pass filter for DC offset cancellation. The cut-off frequency of the HPF is 1.0Hz at fs=48kHz
and scales with the sampling rate (fs).
■ Master Clock Output
The AK4613 has a master clock output pin. If DIV bit = “1”, the MCKO pin output the frequency divided in half.
DIV
MCKO
0
XTI x1 ^(default)
1
XTI x1/2
Table 9. The select of Master clock output frequency
■ Master Mode and Slave Mode
Master Mode and Slave Mode are selected by setting the M/S pin. (Master Mode= “H”, Slave Mode= “L”)
LRCK and BICK pins are outputs in Master Mode (M/S pin= “H”)
LRCK and BICK pins are inputs in Slave Mode (M/S pin= “L”)
PDN
L
H
M/S pin
L
H
L
H
LRCK pin
Input
“L” Output
Input
Output
BICK pin
Input
“L” Output
Input
Output
Table 10. LRCK and BICK pins
MS1052-E-02
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2010/03