LM1203 RGB Video Amplifier System DIP-28W
A triple-channel 70MHz video amp system for RGB monitors with integrated matched contrast control and individual drive adjustments in a 28-pin DIP package.
120.00 EGP
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The LM1203 is an integrated circuit designed as a comprehensive video amplifier system specifically for high-resolution RGB color monitors. It consolidates the critical analog signal processing chain for red, green, and blue channels into a single 28-pin package. This chip was engineered to serve as the central component between the video input signals and the cathode drivers of a CRT, handling the essential tasks of amplification and DC level control to ensure accurate and stable color reproduction on the display.
The system incorporates three wideband video amplifiers that are inherently matched for consistent performance across all three color channels. A key aspect of its design is the inclusion of three accurately matched attenuators that provide master contrast control, ensuring the relative intensity of the colors remains balanced as the overall picture level is adjusted. Furthermore, it contains three gated black level clamp comparators, which are crucial for setting and maintaining the correct brightness by clamping the video signal during the blanking interval, preventing picture drift.
To maximize performance in demanding monitor applications, the LM1203 includes a stable voltage reference for the video inputs and provides individual “Drive” adjustment pins for each amplifier. This allows for fine-tuning the gain of each channel to compensate for variations in the CRT’s cathodes or external components, ensuring precise white balance. Its output stages are designed as low-impedance drivers capable of delivering the signal levels required to drive subsequent stages, making it a robust and flexible solution for professional and high-end consumer display systems.
Pinout Diagram:
Pin Configuration:
| Pin No | Pin Name | Description |
|---|---|---|
| 1 | VCC 1 | Voltage Supply Pin 1 |
| 2 | CONTRAST CAP | Contrast Cap Pin |
| 3 | CONTRAST CAP | Contrast Cap Pin |
| 4 | R VIDEO IN | R Video Input Pin |
| 5 | R CLAMP CAP | R Clamp Cap Pin |
| 6 | G VIDEO IN | G Video Input Pin |
| 7 | GND | Ground Pin |
| 8 | G CLAMP CAP | G Clamp Cap Pin |
| 9 | B VIDEO IN | B Video Input Pin |
| 10 | B CLAMP CAP | B Clamp Cap Pin |
| 11 | VREF | Reference Voltage Pin |
| 12 | CONTRAST | Contrast Pin |
| 13 | VCC 1 | Voltage Supply Pin 1 |
| 14 | CLAMP GATE | Clamp Gate Pin |
| 15 | B CLAMP + | B Clamp Positive Pin |
| 16 | B VIDEO OUT | B Video-Output Pin |
| 17 | B CLAMP – | B Clamp Negative Pin |
| 18 | B DRIVE | B Drive Pin |
| 19 | G CLAMP + | G Clamp Positive Pin |
| 20 | G VIDEO OUT | G Video Output Pin |
| 21 | G CLAMP – | G Clamp Negative Pin |
| 22 | G DRIVE | G Drive Pin |
| 23 | VCC 2 | Voltage Supply Pin 2 |
| 24 | R CLAMP + | R Clamp Positive Pin |
| 25 | R VIDEO OUT | R Video Output Pin |
| 26 | R CLAMP – | R Clamp Negative Pin |
| 27 | R DRIVE | R Drive Pin |
| 28 | VCC 2 | Voltage Supply Pin 2 |
Features:
- Three wideband video amplifiers (70 MHz @ b3dB)
- Inherently matched (g0.1 dB or 1.2%) attenuators for contrast control
- Three externally gated comparators for brightness control
- Provisions for independent gain control (Drive) of each video amplifier
- Video input voltage reference
- Low-impedance output driver
Specifications:
| Parameter | Specification |
|---|---|
| Supply Voltage (Vcc): | 10.8V to 13.2V |
| Typical Supply Current: | 73 mA |
| Video Amplifier Bandwidth: | 70 MHz |
| Maximum Video Amplifier Gain: | 6.0 V/V (Typ) |
| Contrast Control Range: | Approx. -40 dB to 0 dB (at 2V to 12V) |
| Gain Matching (Av max): | ±0.5 dB (Typ) |
| Output Voltage Swing: | 0.9V (Low, Typ) to 8.9V (High, Typ) |
| Clamp Gate Logic High: | > 1.6V (Min) |
| Clamp Gate Logic Low: | < 1.2V (Max) |
| Package: | DIP-28 |
Applications:
- CRT video amplifiers.
- Video switches.
- High-frequency video pre-amplifiers.
- Wideband gain controls.
- PC monitors.
- Workstation.
Package Contents:
- 1x LM1203 RGB Video Amplifier System DIP-28W
Datasheet
| Weight | 10 g |
|---|---|
| Dimensions | 15 × 40 × 10 mm |
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