參數(shù)資料
型號(hào)： AK4704
廠商： Asahi Kasei Microsystems Co.,Ltd
英文描述： 2ch 24bit DAC with AV SCART switch
中文描述： 2通道24位DAC，具有影音SCART開關(guān)
文件頁(yè)數(shù)： 26/44頁(yè)
文件大小： 440K
代理商： AK4704
ASAHI KASEI
AKM CONFIDENTIAL
[AK4704]
Rev. 0.5
2004/1
- 26 -
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 16. RGB video gain control
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 75ohm resisters. The CLAMP1 and CLAMP0 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
VCLP1
VCLP0
Sync Source of DC Restore
0
0
0
1
1
0
1
1
When the AUTO bit = “1”, the source is fixed to VCRVIN.
Table 17. DC restore source control
Y/C Mixer for RF modulator (06H: D4)
When the YC bit = “1”, the RFV pin outputs Y/C mixed signal from TVVOUT pin and TVRC pin.
YC : Y/C mixing output control for RFV pin
0 : Follow VRF1-0 bits (default)
1 : Y/C mixing from TVVOUT and TVRC.
ENCV (default)
ENCY
VCRVIN
(Reserved)
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