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ELM304

ELM Electronics
Part Number ELM304
Manufacturer ELM Electronics
Description NTSC Video Generator
Published Aug 1, 2008
Detailed Description ELM304 NTSC Video Generator Description The ELM304 is a low-cost NTSC video signal generator in an 8 pin package. It re...
Datasheet PDF File ELM304 PDF File

ELM304
ELM304

Overview
ELM304 NTSC Video Generator Description The ELM304 is a low-cost NTSC video signal generator in an 8 pin package.
It requires only a few external components in order to generate a stable monochrome raster that is useful in a variety of video applications.
The ELM304 can generate either a solid white raster or a four-level gray scale pattern simply by changing the logic level at the Mode input pin.
An internal pullup resistor simplifies the connection of this pin to mechanical switches.
Although originally designed to provide a 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.
Please note that while this circuit uses a colourburst crystal as a timing reference, the ELM304 will not actually generate a colourburst, so the output is monochrome (ie ‘Black and White’).
Applications • Video Source for Video Cassette Recorders • Classroom Instructional Aid • Test Bench Video Generator Features • North American 525 line 60Hz NTSC signal • Standard 1V p-p NTSC sync negative output • Generates both solid and bar type patterns • No external amplifier required • Requires no adjustments • Wide supply range - 3.
0 to 5.
5 volt operation • Uses a standard 3.
58MHz crystal • Low power CMOS design Connection Diagram PDIP and SOIC (top view) VDD 1 XT1 2 XT2 3 Mode 4 8 VSS 7 V1 6 V2 5 V3 Block Diagram XT1 2 XT2 3 Master Oscillator Pattern Generator VDD Mode 4 Output Matrix 7 V1 6 V2 5 V3 ELM304DSC Elm Electronics – Circuits for the Hobbyist < http://www.
elmelectronics.
com/ > 1 of 6 ELM304 Pin Descriptions VDD (pin 1) This pin is the positive supply pin, and should always be the most positive point in the circuit.
Internal circuitry connected to this pin is used to provide power-on reset of the microprocessor, so an external reset signal is not required.
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