參數(shù)資料
型號(hào)： AK4706
廠商： Asahi Kasei Microsystems Co.,Ltd
英文描述： 2ch 24bit DAC with AV Switch & HD/SD Video Filter
中文描述： 2通道24位DAC，帶有AV系列開(kāi)關(guān)
文件頁(yè)數(shù)： 31/53頁(yè)
文件大小： 597K
代理商： AK4706
ASAHI KASEI
[AK4706]
MS0507-E-00
2006/05
- 31 -
CIO
0
0
1
1
VCRC
0
1
0
1
State of VCRC pin
Hi-Z (default)
Active
Connected to GND
Connected to GND
Table 17 Red/Chroma Bi-directional Control
RGB Video Gain Control (06H: D1-D0)
VVOL1-0 bits set the RGB video gain.
VVOL1
0
0
1
1
VVOL0
0
1
0
1
Gain
+6dB
+7.2dB
+8.2dB
+9.1dB
Output level (Typ. @Input=0.7Vpp)
1.4Vpp (default)
1.6Vpp
1.8Vpp
2.0Vpp
Table 18. RGB video gain control
Clamp and DC-restore circuit control (06H: D7-D2, 0AH: D3)
Each CVBS and Y input has the sync tip clamp circuit. The DC-restore circuit has two clamp voltages 0.7V(typ) and
2.2V(typ) to support both RGB and YPbPr signal. They correspond to 0.35V(typ) and 1.1V(typ) at the SCART connector
when matched by 75ohm resistors. The CLAMP1, CLAMP0 and CLAMPB bits select the input circuit for ENCRC pin
(Encoder Red/Chroma), ENCB pin (Encoder Blue), VCRRC pin (VCR Red/Chroma) and VCRB pin (VCR Blue)
respectively. VCLP1-0 bits select the sync source of DC- restore circuit.
CLAMPB
CLAMP0
VCRRC Input Circuit
VCRB Input Circuit
0
0
DC restore (0.7V)
DC restore (0.7V)
0
1
Biased
DC restore (0.7V)
1
0
DC restore (2.2V)
DC restore (2.2V)
1
1
(reserved)
(reserved)
Table 19. DC-restore control for VCR Input
CLAMPB
CLAMP1
ENCRC Input Circuit
0
0
DC restore (0.7V)
0
1
Biased
1
0
DC restore (2.2V)
1
1
(reserved)
Table 20. DC-restore control for Encoder Input
CLAMP2
ENCG Input Circuit
0
DC restore (0.7V)
1
Sync tip clamp (0.7V)
Note: When the VTV2-0 bits = “001”, TVG bit =”1” and VCLP2-0 bits = “011”, Sync tip is selected even if the CLAMP2
bit = “0”.
Table 21. DC-restore control for Encoder Green/Y Input
VCRG Input Circuit
DC restore (0.7V)
DC restore (0.7V)
Sync Tip Clamp (0.7V)
(reserved)
note
for RGB
for Y/C
for YPbPr
default
ENCB Input Circuit
DC restore (0.7V)
DC restore (0.7V)
DC restore (2.2V)
(reserved)
note
for RGB
for Y/C
for YPbPr
default
note
for RGB
for YPbPr
default
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