LM1246DEW/NA DIP-24 Signal Processing Chip IC
The LM1246 is a high-performance, 150 MHz integrated CMOS CRT preamplifier designed for modern CRT displays. It features an I²C compatible interface, allowing a microcontroller to digitally control all parameters necessary for video setup and adjustment, including gain and contrast.
✨Features
- High-Speed Operation: 150 MHz channel bandwidth.
- Full OSD Capability:
- Internal 512 character OSD ROM.
- Internal 512 character OSD RAM.
- Fully addressable 512 character OSD.
- Features like OSD Window Fade In/Fade Out and Half Tone Transparency.
- Digital Control: Enhanced I²C compatible microcontroller interface.
- Integrated DACs: Four 8-bit resolution DAC outputs for bus controlled CRT bias and brightness.
- System Integration:
- Matched for use with LM246x drivers and LM2479/80 bias IC’s.
- Video Data dectection for Auto Centering & Sizing.
- OSD override allows OSD messages to override video.
- Blanking Control:
- Horizontal and vertical blanking and OSD synchronization directly from deflection signals.
- Vertical blanking duration is register programmable.
- 4-Bit Programmable start position for internal Horizontal Blanking.
- Protection & Power:
- Spot killer which blanks the video outputs when VCC falls below the specified threshold.
- Power Saving Mode with 65% power reduction.
- ESD protection of 3.0 kV.
📋Specifications
| Parameter | Value |
|---|---|
| Operating Conditions | |
| Supply Voltage (VCC) | 4.75V to 5.25V |
| Operating Temperature Range | 0°C to +70°C |
| Video Inputs (pk-pk) | 0.0V to 1.0V |
| Video Performance | |
| Channel Bandwidth (-3 dB, Typ) | 150 MHz |
| Video Rise Time (Typ) | 3.1 ns |
| Video Fall Time (Typ) | 2.9 ns |
| Maximum Voltage Gain (Typ) | 4.1 V/V |
| Maximum Contrast Attenuation (Typ) | -20 dB |
| Maximum Gain Match between Channels | ±0.5 dB |
| Power Consumption | |
| Supply Current (Typ) | 200 mA |
| Supply Current (Power Save Mode, Typ) | 70 mA |
| DAC Outputs | |
| Resolution | 8-bit |
| Min Output Voltage | 0.5V (Min), 0.7V (Max) |
| Max Output Voltage (Mode 00) | 3.7V (Min), 4.2V (Max) |
| Max Load Current | ±1.0 mA |
| System Interface | |
| Horizontal Frequency (Min) | 25 kHz |
| Horizontal Frequency (Max) | 110 kHz |
| Package | 24-lead DIP |
🎯 Applications
- Low-end 15″ and 17″ bus-controlled monitors that require OSD.
- 1024×768 displays running up to 85 Hz that need OSD capability.
- Very low-cost monitor systems using the LM246x driver.
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