[AK4709]
2. Audio Block
■ Switch Control
The AK4709 has switch matrixes designed primarily for SCART routing. Those are controlled via the control register as
shown in Table 4 and Table 5 (Please refer to the Block Diagram).
(01H: D1-D0)
TV1
TV0
Source of TVOUTL/R
AMP
0
0
1
1
0
1
0
1
VCRIN
Mute
(Reserved)
(default)
Table 4. TVOUT Switch Configuration
(01H: D5-D4)
VCR1
VCR0 Source of VCROUTL/R
0
0
1
1
0
1
0
1
AMP
TVIN
Mute
(default)
Volume#1 output
Table 5. VCROUT Switch Configuration
■ Volume Control #0 (11-Level Volume)
The AK4709 has a 11-level volume control (Volume #0) as shown in Table 6. The volume reflects the change of register
value immediately.
2Vrms
AINL/R+
1Vrms
Volume Gain 0dB
Volume #0
300Ω
2Vrms differential
input
0.47μ
0.47μ
TVOUTL/R
300Ω
(VCROUTL/R)
AINL/R-
1Vrms
Figure 4. Volume #0(Volume Gain=0dB: default), Full Differential Stereo Input
(0DH: D6-D3)
VOL3
VOL2
VOL1
VOL0
Volume #0 Gain
NA
Output Level (Typ)
1
1
1
1
1
0
0
0
0
0
0
1
0
0
0
0
1
1
1
1
0
x
1
1
0
0
1
1
0
0
1
x
1
0
1
0
1
0
1
0
1
-
+24dB
+21dB
+18dB
+15dB
+12dB
+9dB
2Vrms (with 0.13Vrms differential input)
-
2Vrms (with 0.25Vrms differential input)
-
2Vrms (with 0.5Vrms differential input)
-
+6dB
2Vrms (with 1Vrms differential input)
-
+3dB
0dB
2Vrms (with 2Vrms differential input: default)
0
0
0
1
0
0
0
1
0
-3dB
-6dB
Mute
-
0
0
1Vrms (with 2Vrms differential input)
-
Note: Volume #1=0dB
(x: Don’t care)
Table 6. Volume #0, Full Differential Stereo Input
MS1319-E-00
2011/07
- 17 -
AKM [ ASAHI KASEI MICROSYSTEMS ]
