AK4564 Datasheet, PDF (36/48 Pages) Asahi Kasei Microsystems – 16BIT CODEC WITH BUILT-IN ALC AND MIC/HP/SPK-AMP

ASAHI KASEI
[AK4564]
Mode Control
Addr
Register Name
03H Mode Control
Default
D7
D6
D5
D4
VOL2-1 VOL2-0 VOL1-1 VOL1-0
0
1
0
1
D3
DIF1
0
D2
DIF0
0
D1
DEM1
0
D0
DEM0
1
DEM1-0: Select De-emphasis Frequency
The AK4564 includes the digital de-emphasis filter (tc = 50/15µs) 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
0
0
44.1kHz
0
1
OFF
1
0
48kHz
1
1
32kHz
Table 6. De-emphasis Frequencies
Default
DIF1-0: Select Audio Data Format
No. DIF1 bit DIF0 bit
0
0
0
1
0
1
2
1
0
3
1
1
SDTO(ADC)
SDTI(DAC)
MSB justified
LSB justified
LSB justified
LSB justified
MSB justified
I²S compatible
MSB justified
I²S compatible
Table 7. Audio Data Format
BCLK
≥ 32fs
= 64fs
≥ 32fs
≥ 32fs
Figure
Figure 8
Figure 9
Figure 10
Figure 11
Default
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
0
0
1
1
VOL2-0
VOL1-0
GAIN AVDD Voltage
0
+7.1dB
2.6V
1
+6.5dB
2.8V
0
+5.9dB
3.0V
1
0dB
2.8V
Table 8. LINEOUT volume setting
LINEOUT
+2dBV
+2dBV
+2dBV
-4.5dBV
Default
MS0140-E-01
- 36 -
2002/07