General Description
The LM1203 is a wideband video amplifier system intended for high-resolution RGB color monitor applications. In addition to three matched video amplifiers, the LM1203 contains three gated differential input black-level clamp comparators for brightness control and three matched attenuator circuits for contrast control. Each video amplifier contains a gain set or ‘‘Drive’’ node for setting maximum system gain (Av e 4 to 10) as well as providing trim capability. The LM1203 also contains a voltage reference for the video inputs. For high-resolution monochrome monitor applications see the LM1201 Video Amplifier System datasheet.
LM1203 Pinout
LM1203 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
Applications
- CRT video amplifiers
- Video switches
- High-frequency video pre-amplifiers
- Wideband gain controls
- PC monitors
- Workstation
