AK4545 Datasheet, PDF (22/33 Pages) Asahi Kasei Microsystems – AC97 AUDIO CODEC WITH SRC AND DIT

[ASAHI KASEI]
n Record Gain Register (Index 1Ch)
Mute _{Gx3 Gx2 Gx1 Gx0 Gain}
0
0
0
0
0
0dB
0
0
0
0
1
1.5dB
0
0
0
1
0
3.0dB
--------------------------------------------------------------
0
1
1
1
1 22.5dB
1
X
X
X
X
Mute
[AK4545]
n General Purpose Register (Index 20h)
The following table shows the relationship between the bit and control for several miscellaneous functions of the
AK4545.
POP
DFC
3D
MIX
MS
LPBK
Bit
D15
D14
D13
D9
D8
D7
Function
PCM(DAC) Bypass 3D
0= Via 3D Path, 1= 3D Bypass
DAC Feed Back Control
0=Mix, 1=DAC only
3D Stereo Enhancement
0=Off, 1=On
Mono Output Select
0=Mix, 1=Mic
Mic Select
0=Mic1, 1 =Mic2
ADC/DAC Loopback Mode
1= Loopback
Comment
Controls whether DAC output is mixed with analog inputs before
the 3D circuit (POP=0) or after the 3D circuit (POP=1)
Controls whether Mix (DFC=0) or DAC only (DFC=1) is sent to the
output
Controls whether the 3D circuit is bypassed (3D=0) or used (3D=1)
Controls whether Full Mix (Mix=0) or Mic inputs (Mix=1) is send to
MONO_OUT
Selects Mic1 input (MS=0) or Mic2 (MS=1)
Selects normal operation (LPBK=0) or loops ADC data directly to
DACs (LPBK=1)
Relations of control bits D15,14,13
POP _DFC
3D
Function
X
0
0 3D bypass to Volumes ( Normal )
Mixer à Vol
Path at selecting “Stereo Mixer” record(1Ah register = 0505h)
Analog INPUT
(Line,CD,Mic…..)
Mixer
ADC
S_DATA_IN
DAC
Volume
Line Out
0
0
1
3D output to Volumes
Mixer à 3D à Vol
Analog INPUT
(Line,CD,Mic…..)
Mixer
DAC
ADC
3D
Volume
S_DATA_IN
Line Out
1
0
X
1
1 ( 3D out + DAC ) to Volumes
( Mixer(w/0 DAC) + DAC ) à Vol _{Analog INPUT}
(Line,CD,Mic…..)
Mixer
ADC
S_DATA_IN
DAC
3D
Volume
Line Out
X Only DAC fed to Volumes
DAC à Vol
Analog INPUT
Then the path from DAC to Mixer is (Line,CD,Mic…..)
Mixer
cut.
DAC
ADC
Volume
S_DATA_IN
Line Out
D13(3D) will activate the AKM ’s 3D enhancement.
LPBK(ADC/DAC Loopback Mode) bit enables to output ADC data to DAC. While this function is used, the
sample rates of ADC and DAC must be set to 48KHz.
MS0058-E-00
- 22 -
2000/11