參數(shù)資料
型號： CH7002D
廠商： Electronic Theatre Controls, Inc.
英文描述： Scalable VGA to NTSC/PAL Encoder
中文描述： 可擴展顯卡至NTSC / PAL編碼器
文件頁數(shù)： 10/36頁
文件大?。?/td> 199K
代理商： CH7002D
CHRONTEL
CH7002D
10 201-0000-029 Rev6.1, 8/2/99
Power Management
The CH7002 supports four operating states (including Normal [On], Power Down, S-Video Off, and Composite
Off) to provide optimal power consumption for the application involved. Using the programmable power down
modes accessed over the I
2
C port, the CH7002 may be placed in either Normal state, or any of the four power
managed states listed below (see the
Miscellaneous Control Register
under the
Registers and Programming
section). To support power management, a TV sensing function (see
Connection Detect Register
) is provided, which
identifies whether a TV is connected to S-Video or Composite, or neither. This sensing function can then be used to
enter into the appropriate operating state (e.g., if TV is sensed only on Composite, the S-Video Off mode could be
set by software).
When using direct pin-programming mode for the CH7002, only Normal and Power Down states are supported as
selected by the Display Mode inputs. When inputs DM[2:0] are set to a 111 state, the CH7002 is placed in Power
Down state. The CH7002 operates in Normal mode when the Display Mode settings are set to any valid state (where
DM[2:0] is between 000 and 110).
Luminance Filter Options
The CH7002 contains a set of luminance filters to provide a controllable bandwidth output on both composite and S-
Video outputs. The response of the luminance filters are shown in the graphs in Figures 7 and 8. The horizontal axis
is frequency in Mhz, and the vertical axis is gain in dBs.
The possible S-Video MHz responses are:
Y_SV0: A high frequency response, selected by setting YC-HI to 1 in the Y-filter register.
Y_SV1: A lower frequency response, selected by setting YC-HI to 0 in the Y-filter register.
Y_SV2:
A lower frequency response, with peaking enabled, which gives improved transient response,
with matching pre-shoot and overshoot of 6%. This is selected by setting YC-HI to 0 and
YPEAKD to 0 in the Y-filter register. Note that peaking can only be enabled in the lower
frequency response mode.
The possible CVBS (composite) responses are:
Y_CV0: A high frequency response, selected by setting YCV-HI to 1 in the Y-filter register.
Y_CV1: A lower frequency response, selected by setting YCV-HI to 0 in the Y-filter register. This setting
will result in a reduced amount of cross-luminance artifacts.
Power State
Normal (On):I
Power Down:I
Functional Description
In the normal operating state, all functions and pins are active
In the complete power-down state, most pins and circuitry are
disabled.The CLKOUT pin, however, will continue to provide
14.318 Mhz out. This places the CH7002 in its lowest power
consumption mode
In Composite-off state, power is shut off to the unused DAC
associated with CVBS output, thereby reducing power by
approximately 10%
Power is shut off to the unused DAC associated with CVBS output
Composite Off
S-Video Off
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相關(guān)代理商/技術(shù)參數(shù)
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CH7002D-V 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Scalable VGA to NTSC/PAL Encoder
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CH7003B-V 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Digital PC to TV Encoder
CH7004C 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Digital PC to TV Encoder with Macrovision
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