參數(shù)資料
型號(hào)： CH7002D
廠商： Electronic Theatre Controls, Inc.
英文描述： Scalable VGA to NTSC/PAL Encoder
中文描述： 可擴(kuò)展顯卡至NTSC / PAL編碼器
文件頁(yè)數(shù)： 3/36頁(yè)
文件大小： 199K
代理商： CH7002D
CHRONTEL
CH7002D
201-0000-029 Rev 6.1, 8/2/99
3
Table 1. Pin Description
44-Pin
PLCC
Type
Symbol
Description
2, 4, 6, 27,
39,42
Power
AGND
Analog ground
These pins provide the ground reference for the analog section of CH7002,
and MUST be connected to the system ground to prevent latchup. Refer to
the
Application Information
section
for information on proper supply
decoupling.
VGA Inputs
These pins should be terminated with 75 ohm resistors and isolated from
switching digital signals and video output pins. Refer to the
Application
Information
section for detailed technical guidance and alternative connection
techniques.
Analog Supply Voltage
These pins supply the 5V power to the analog section of the CH7002. For
information on proper supply decoupling, refer to the
Application Information
section
.
Clock Output
This pin defaults to 14.31818 MHz upon power-up and remains active at all
times (including power-down).
Digital Supply Voltage
These pins supply the 5V power to the digital section of CH7002. For
information on proper supply decoupling, refer to the
Application Information
section.
Digital Ground
These pins provide the ground reference for the digital section of CH7002,
and MUST be connected to the system ground to prevent latchup. For
information on proper supply decoupling, refer to the
Application Information
section.
Crystal Input
A parallel resonance 14.31818 MHz (± 50 ppm) crystal should be attached
between XI and XO/FIN. However, if an external CMOS clock is attached to
XO/FIN, XI should be connected to ground.
Crystal Output or External Fref
A 14.31818 MHz (± 50 ppm) crystal may be attached between XO/FIN and
XI. An external CMOS compatible clock can be connected to XO/FIN as an
alternative.
DAC Power Supply
These pins supply power to CH7002’s internal DACs. Refer to
the
Application
Information
section for information on proper supply decoupling.
Reference Resistor
A 324
resistor with short and wide traces should be attached between
RSET and ground. No other connections should be made to this pin.
DAC Ground
These pins provide the ground reference for CH7002’s internal DACs. For
information on proper supply decoupling, refer to the
Application Information
section.
Luminance Outpu
t
A 75
termination resistor with short traces should be attached between Y
and ground for optimum performance. Use of additional filters is discussed in
the
Application Information
section.
Composite Outpu
t
A 75
termination resistor, with short traces, should be attached between
CVBS and ground for optimum performance. Use of additional filters is
discussed in the
Application Information
section.
1, 3, 5
In
B, G, R
7, 37, 40,
44
Power
AVDD
15
Out
CLKOUT
8, 14, 33
Power
DVDD
10, 16, 31
Power
DGND
17
In
XI
18
In
XO/FIN
25
Power
VDD
26
In
RSET
21
Power
GND
24
Out
Y
23
Out
CVBS
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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
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