AK4709 Datasheet, PDF (17/42 Pages) Asahi Kasei Microsystems – Low Power AV SCART Switch

[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
0
0
AMP
0
1
VCRIN
(default)
1
0
Mute
1
1
(Reserved)
Table 4. TVOUT Switch Configuration
(01H: D5-D4)
VCR1 VCR0
Source of VCROUTL/R
0
0
AMP
0
1
TVIN
1
0
Mute
1
1
Volume#1 output
Table 5. VCROUT Switch Configuration
(default)
■ 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.
1Vrms
2Vrms differential
input
1Vrms
AINL/R+
300Ω
0.47μ
300Ω
0.47μ
AINL/R-
Volume Gain 0dB
Volume #0
2Vrms
TVOUTL/R
(VCROUTL/R)
Figure 4. Volume #0(Volume Gain=0dB: default), Full Differential Stereo Input
(0DH: D6-D3)
VOL3 VOL2
1
1
1
0
1
0
1
0
1
0
0
1
0
1
0
1
0
1
0
0
0
0
0
0
0
0
Note: Volume #1=0dB
VOL1
x
1
1
0
0
1
1
0
0
1
1
0
0
VOL0 Volume #0 Gain
Output Level (Typ)
x
NA
-
1
+24dB
2Vrms (with 0.13Vrms differential input)
0
+21dB
-
1
+18dB
2Vrms (with 0.25Vrms differential input)
0
+15dB
-
1
+12dB
2Vrms (with 0.5Vrms differential input)
0
+9dB
-
1
+6dB
2Vrms (with 1Vrms differential input)
0
+3dB
-
1
0dB
2Vrms (with 2Vrms differential input: default)
0
-3dB
-
1
-6dB
1Vrms (with 2Vrms differential input)
0
Mute
-
Table 6. Volume #0, Full Differential Stereo Input
(x: Don’t care)
MS1319-E-00
- 17 -
2011/07