CH7001C Datasheet, PDF (1/18 Pages) List of Unclassifed Manufacturers – VGA to NTSC/PAL Encoder

CHRONTEL
CH7001C
VGA to NTSC/PAL Encoder
Features
• Enhanced bandwidth and signal-to-noise ratio for
higher video performance
• Integrated triple video rate 8-bit analog to digital
converters for input RGB
• 3-line digital vertical filtering with pin-
programmable characteristics for optimum anti-
flicker and resolution
• On-chip phase-locked loop generates sampling
clock from VGA horizontal sync
• Enhanced power management for selective circuit
power-down
• Simultaneous composite/S-video output
• Horizontal and vertical position control
• Pin-programmable underscan/overscan mode
• On-chip reference generation and loop filter
• CMOS technology in 44-pin PLCC
• 5V supply
Description
Chrontel’s CH7001C VGA to NTSC/PAL encoder is a
stand-alone integrated circuit that converts analog VGA
inputs directly into 525-line (M) NTSC or 625-line
(B, D, G, H, I) PAL composite video and S-video
outputs.
This circuit integrates a digital NTSC/PAL encoder
with 8-bit ADC and DAC interfaces, a 3-line vertical
filter and low-jitter phase-locked loop to create
outstanding quality video with 24-bits-per-pixel proces-
sing throughout the entire signal path.
A high level of integration and performance makes the
CH7001C ideal for a variety of stand-alone and system-
level integration solutions, including notebook
computers and PC add-on graphics cards.
HORIZONTAL, VERTICAL
POSITION CONTROL
STROBE CLKOUT CLKEN* NTSC/PAL* PD[1:0] VDD DVDD AVDD RSET VREF1 VREF2
UNDERSCAN
MS[1:0]
R
G
B
H
V
BLANKING
H,V SYNC
GENERATOR
ADC
ADC
ADC
VERTICAL
FILTER
SCAN-RATE
CONVERTER
COLOR
SPACE
CONVERTER
PLL
SYSTEM CLOCKS
Y
FILTER
U
FILTER
RSET
VREF
M
U
DAC
X
Σ
DAC
M
U
X
Σ
X
DAC
V
FILTER
M
U
X
X
BLANKING COLOR-BURST
CONTROL
SIN + COSINE
GENERATOR
OSC
Figure 1: Functional Block Diagram
Y
CVBS
C
201-0000-028 Rev 3.0, 6/2/99
1