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AK4703 Datasheet, PDF (18/38 Pages) Asahi Kasei Microsystems – AV SCART switch | |||
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ASAHI KASEI
AKM CONFIDENTIAL
[AK4703]
 Clamp and DC-restore circuit control (06H: D6-D5, D3-D2)
Each CVBS and Y input has the sync tip clamp circuit. The sync tip voltage at each output is 0.7V (typ). This corresponds
0.35V (typ) at the SCART connector when matched by 75⦠resistors. The CLAMP1-0 bits select the input circuit for
ENCRC pin (Encoder Red/Chroma) and VCRRC pin (VCR Red/Chroma) respectively. VCLP1-0 bits select the source of
DC-restore circuit.
CLAMP1: Encoder Red/Chroma (ENCRC pin) input clamp control
0: DC restore clamp active (for RED signal. Default)
1: Biased (for Chroma signal.)
CLAMP0: VCR R/C (VCRRC pin) input clamp control
0: DC restore clamp active (for RED signal)
1: Biased (for Chroma signal. Default.)
VCLP1-0: DC restore source control
When the AUTO bit = â1â, the source is fixed to VCRVIN.
VCLP1 bit VCLP0 bit Sync Source of DC Restore
0
0
ENCV (Default)
0
1
ENCY
1
0
VCRVIN
1
1
(Reserved)
Table 10. DC restore source control
Rev. 0.1
- 18 -
2004/03
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