ch7004c Chrontel, ch7004c Datasheet - Page 4

• Manufacturer Part Number: ch7004c
• Description: Digital Pc To Tv Encoder With Macrovisiontm
• Manufacturer: Chrontel

CHRONTEL
4
Table 1. Pin Descriptions
44Pin
LQFP
20
17
26
27
29
34
31
N/A
25
19,23
5,16,
30,38
8,18,
28,36
Type
Out
Out
In/Out
In
In
Power
Power
In/out
Power
Power
Power
Power
Symbol
CVBS/B
CSYNC
SD
SC
ADDR
AGND
AVDD
GPI 0
[3:0]
VDD
GND
DVDD
DGND
Description
Composite Video Output
A 75 Ω termination resistor with short traces should be attached between CVBS and
ground for optimum performance. In normal operating modes other than SCART, this
pin outputs the composite video signal. In SCART mode, this pin outputs the blue
signal.
Composite Sync Output
A 75 Ω termination resistor with short traces should be attached between CSYNC
and ground for optimum performance. In SCART mode, this pin outputs the
composite sync signal.
Serial Data (External pull-up required)
This pin functions as the serial data pin of the serial interface port (see the Serial
Port Operation section for details).
Serial Clock (Internal pull-up)
This pin functions as the serial clock pin of the serial interface port (see the Serial
Port Operation section for details).
Serial Port Address Select (Internal pull-up)
This pin is the Serial Port Address Select, which corresponds to bits 1 and 0 of the
serial port device address (see the Serial Port Operation section for details), creating
an address selection as follows:
Analog ground
These pins provide the ground reference for the analog section of the CH7004, and
MUST be connected to the system ground, to prevent latchup. Refer to the
Application Information section for information on proper supply de-coupling.
Analog Supply Voltage
These pins supply the 5V power to the analog section of the CH7004.
General Purpose I/O Pin
DAC Power Supply
These pins supply the 5V power to CH7004’s internal DAC’s.
DAC Ground
These pins provide the ground reference for CH7004’s internal DACs. For
information on proper supply de-coupling, please refer to the Application Information
section.
Digital Supply Voltage
These pins supply the 3.3V power to the digital section of CH7004.
Digital Ground
These pins provide the ground reference for the digital section of CH7004, and
MUST be connected to the system ground to prevent latchup.
ADDR
1
0
1110101 = 75H = 117
1110110 = 76H = 118
Serial Port Address Selected
201-0000-024 Rev. 2.4, 6/24/2004
CH7004C