器件名称: ELM304P
功能描述: NTSC Video Generator
文件大小: 28.44KB 共4页
简 介:ELM304 NTSC Video Generator
Description
The ELM304 is a low-cost NTSC video signal generator in an 8 pin package. Requiring only an external crystal and a few passive components, this circuit produces a stable raster that is suitable for a variety of video applications. The ELM304 can be ‘programmed’ to generate either a solid white raster or a four-level gray scale pattern simply by changing the logic level at the mode input pin. A supplied internal pullup resistor further simplifies the circuitry when interfacing to mechanical switches. Although originally designed to provide a stable video input signal for use while recording audio on video cassette recorders, this circuit can also be used for many other instructional and test purposes. The low power consumption and small size of the circuit also makes it ideal for battery-powered applications.
Features
Low power CMOS design - typically 1mA at 5V Wide supply range - 3.0 to 5.5 volt operation Uses a standard 3.58MHz crystal Generates both solid and bar type patterns No external amplifier required Standard 1V p-p NTSC sync negative output Requires no adjustments
Connection Diagram PDIP and SOIC (top view)
VDD
1 2 3 4
8 7 6 5
VSS V1 V2 V3
Applications
Video Source for Video Cassette Recorders Classroom Instructional Aid Test Bench Video Generator
XT1 XT2 Mode
Block Diagram
7
V1 V2 V3
XT1 XT2
2
Master Oscillator
3
Pattern Generator
Output Matrix
6
5
VDD Mode
4
ELM304DSB
Elm Electronics – Circuits……
