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参数资料
| 型号： | CH7013A |
| 厂商： | Electronic Theatre Controls, Inc. |
| 英文描述： | Digital PC to TV Encoder |
| 中文描述： | 数码电脑电视编码器 |
| 文件页数： | 15/46页 |
| 文件大小： | 249K |
| 代理商： | CH7013A |
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CHRONTEL
CH7013A
201-0000-041 Rev. 1.0, 6/14/2000
15
Display Modes
(continued)
proprietory Algorithms for enhancing the readability of text. These modes are fully programmable via the serial port
under the flicker filter register.
Internal Voltage Reference
An on-chip bandgap circuit is used in the DAC to generate a reference voltage which, in conjunction with a
reference resistor at pin RSET, and register controlled divider, sets the output ranges of the DACs. The CH7013A
bandgap reference voltage is 1.235 volts nominal for NTSC or PAL-M, or 1.317 volts nominal (for PAL or NTSC-
J), which is determined by IDF register bit 6 (DACG bit). The recommended value for the reference resistor RSET
is 360 ohms (though this may be adjusted in order to achieve a different output level). The gain setting for DAC
output is 1/48
th
. Therefore, for each DAC, the current output per LSB step is determined by the following equation:
I
LSB
= V(RSET)/RSET reference resistor * 1/GAIN
For DACG=0, this is: I
LSB
= 1.235/360 * 1/48 = 71.4
μ
A (nominal)
For DACG=1, this is: I
LSB
= 1.317/360 * 1/48 = 76.2
μ
A (nominal)
Power Management
The CH7013A supports five operating states including Normal [On], Power Down, Full 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 serial port, the CH7013A may be placed in either Normal state, or any of the
four power managed states, as listed below (see
“
Power Management Register” under the
Register Descriptions
section
for programming information). To support power management, a TV sensing function (see “Connection
Detect Register” under the
Register Descriptions
section) is provided, which identifies whether a TV is connected to
either S-Video or composite. 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).
Luminance and Chrominance Filter Options
The CH7013A contains a set of luminance filters to provide a controllable bandwidth output on both CVBS and S-
Video outputs. All values are completely programmable via the Video Bandwidth Register. For all graphs shown,
the horizontal axis is frequency in MHz, and the vertical axis is attenuation in dBs. The composite luminance and
chrominance video bandwidth output is shown in
Table13
.
Table 12.Power Management
Operating State
Functional Description
Normal (On):
Power Down:
In the normal operating state, all functions and pins are active
In the power-down state, most pins and circuitry are disabled.The
BCO pin will continue to provide either the VCO divided by K3, or
14.318 MHz out, and the P-OUT pin will continue to output a clock
reference.
Power is shut off to the unused DACs associated with S-Video
outputs.
S-Video Off:
Composite Off:
In Composite-off state, power is shut off to the unused DAC
associated with CVBS output.
In this power-down state, all but the I
2
C circuits are disabled. This
places the CH7013A in its lowest power consumption mode.
Full Power Down:
相关PDF资料 |
PDF描述 |
|---|---|
| CH7013A-T | Digital PC to TV Encoder |
| CH7013A-V | Digital PC to TV Encoder |
| CHB1143 | CHB1143 |
| CHF12545CBF | 500 W Power RF Flanged Chip Termination |
| CHF12545CBF500L | 500 W Power RF Flanged Chip Termination |
相关代理商/技术参数 |
参数描述 |
|---|---|
| CH7013A-T | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Digital PC to TV Encoder |
| CH7013A-V | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Digital PC to TV Encoder |
| CH7013B | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Digital PC to TV Encoder |
| CH7013B-D | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Digital PC to TV Encoder |
| CH7013B-DF | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Digital PC to TV Encoder |
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