LM1889 Video Modulator System DIP-18 (LM1889 DIP IC)
The LM1889 is a highly integrated monolithic video modulator designed to interface audio and video signals with the antenna terminals of a standard television receiver. It contains two identical RF oscillators for creating the video carrier and a separate sound subcarrier oscillator. This IC is specifically engineered to encode luminance and chrominance information into a composite video signal, which is then modulated onto a high-frequency carrier for broadcast over a single cable.
This IC is primarily used in early video game consoles, home computers, and closed-circuit television (CCTV) systems. It is a legendary component for Arduino electronics projects in India focusing on retro-gaming hardware repair, creating custom RF modulators for vintage TVs, or developing DIY low-power analog video transmitters for specialized monitoring.
Key Features
- Dual RF oscillators for flexible carrier frequency selection
- Integrated chroma subcarrier oscillator and modulator
- Wide bandwidth for high-resolution composite video
- Low harmonic radiation for cleaner signal transmission
- Single supply operation (typically 12V)
- Built-in DC restoration and clamping for stable video levels
- Minimal external component count required for a full modulator circuit
- High-frequency capability up to VHF channels
Specifications
- IC Type = Video Modulator System
- Function = RF Video Encoding and Modulation
- Supply Voltage = 10V to 15V (12V Typical)
- Logic Family = Linear / Analog
- Package Type = DIP
- Number of Pins = 18
- Mounting Type = Through-Hole
- Operating Temperature = 0 to 70 degrees Celsius
Interfaces
- VIDEO IN = Composite Video Input
- CHROMA IN = Chrominance Signal Input
- RF OUT = Modulated RF Signal Output
- OSC1, OSC2 = Connections for External Tank Circuits
- SOUND IN = Audio Baseband Input
- VCC = Positive Supply Voltage (12V)
- GND = Ground (0V)
- REF = Internal Reference Voltage Pin
