ASAHI KASEI
[AK4564]
Mode Control
Addr
Register Name
D7
D6
D5
D4
D3
DIF1
0
D2
DIF0
0
D1
DEM1
0
D0
DEM0
1
03H Mode Control
Default
VOL2-1 VOL2-0 VOL1-1 VOL1-0
0
1
0
1
DEM1•0: Select De-emphasis Frequency
The AK4564 includes the digital de-emphasis filter (tc = 50/15ms) by IIR filter. The filter
corresponds to three sampling frequencies (32kHz, 44.1kHz and 48kHz). The de-emphasis filter
selected by DEM0 and DEM1 registers are enabled for input audio data.
DEM1
DEM0
Mode
44.1kHz
OFF
0
0
1
1
0
1
0
1
Default
48kHz
32kHz
Table 6. De-emphasis Frequencies
DIF1•0: Select Audio Data Format
No.
0
1
2
3
DIF1 bit
DIF0 bit
SDTO(ADC)
MSB justified
LSB justified
MSB justified
I2S compatible
SDTI(DAC)
LSB justified
LSB justified
MSB justified
I2S compatible
BCLK
Figure
Figure 8
Figure 9
Figure 10
Figure 11
Default
0
0
1
1
0
1
0
1
³ 32fs
= 64fs
³ 32fs
³ 32fs
Table 7. Audio Data Format
VOL1: LOUT1/ROUT1 output volume setting
VOL2: LOUT1/ROUT1 output volume setting
The Power supply voltage for LINEOUT-Amp is supplied from HVDD pin. The output level of
LINEOUT is constant regardless of HVDD voltage. When the output voltage of HVDD pin is
low, the distortion of LINEOUT degrades.
VOL2-1
VOL1-1
VOL2-0
VOL1-0
GAIN
AVDD Voltage LINEOUT
+2dBV
+2dBV
+2dBV
-4.5dBV
0
0
1
1
0
1
0
1
+7.1dB
+6.5dB
+5.9dB
0dB
2.6V
2.8V
3.0V
2.8V
Default
Table 8. LINEOUT volume setting
MS0140-E-01
2002/07
- 36 -
AKM [ ASAHI KASEI MICROSYSTEMS ]
