參數(shù)資料
型號(hào)： AK4708EQ
廠商： Asahi Kasei Microsystems Co.,Ltd
英文描述： AV SCART Switch with Two RGB Outputs
中文描述： 影音SCART開(kāi)關(guān)與兩個(gè)RGB輸出
文件頁(yè)數(shù)： 25/46頁(yè)
文件大?。?/td> 504K
代理商： AK4708EQ
[AK4708]
MS0618-E-00
2007/04
- 25 -
■
Clamp and DC-restore circuit control (06H: D7-D2)
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 75
Ω
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. VCLP2-0 bits select the sync source of DC- restore circuit.
CLAMPB
CLAMP0
VCRRC Input Circuit
DC restore clamp active
(0.7V at sync timing/output pin)
Biased
(2.2V at sync timing/output pin)
DC restore clamp active
(2.2V at sync timing/output pin)
1
1
(reserved)
Table 14. DC-restore control for VCR Input
CLAMPB
CLAMP1
ENCRC Input Circuit
DC restore clamp active
(0.7V at sync timing/output pin)
Biased
(2.2V at sync timing/output pin)
DC restore clamp active
(2.2V at sync timing/output pin)
1
1
(reserved)
Table 15. DC-restore control for Encoder Input
CLAMP2
ENCG Input Circuit
DC restore clamp active
(0.7V at sync timing/output pin)
Sync tip clamp active
(0.7V at sync timing/output pin)
Note: When the VTV2-0 bits = “001”(source for TV = Encoder CVBS /RGB), TVG bit = “1” (TVG = active) and
VCLP1-0 bits = “11”(DC restore source = ENCG), the sync tip is selected even if the CLAMP2 bit = “0”.
Table 16. DC-restore control for Encoder Green/Y Input
VCLP2-0: DC restore source control
VCLP2
VCLP1
VCLP0
Sync Source of DC Restore
0
0
0
0
0
1
0
1
0
0
1
1
1
0
0
1
0
1
1
1
0
1
1
1
Note: When the AUTO bit = “1”, the source is fixed to VCRVIN.
Table 17. DC-restore source control
VCRB Input Circuit
DC restore clamp active
(0.7V at sync timing/output pin)
(DC restore clamp active)
(0.7V at sync timing output pin)
DC restore clamp active
(2.2V at sync timing/output pin)
(reserved)
note
0
0
for RGB
0
1
for Y/C
(default)
1
0
for Y/Pb/Pr
ENCB Input Circuit
DC restore clamp active
(0.7V at sync timing/output pin)
DC restore clamp active
(0.7V at sync timing output pin)
DC restore clamp active
(2.2V at sync timing/output pin)
(reserved)
note
0
0
for RGB
(default)
0
1
for Y/C
1
0
for Y/Pb/Pr
note
0
for RGB
(default)
1
for Y/Pb/Pr
ENCV
ENCY
VCRVIN
ENCG
VCRG
(reserved)
(reserved)
(reserved)
(default)
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