Overview
The LMH1981MTX/NOPB is a high-performance multi-format video sync separator produced by Texas Instruments (previously National Semiconductor). It is designed for use in a wide range of video applications, including broadcast and professional video equipment, HDTV/DTV systems, and other video processing devices. The LMH1981 automatically detects the input video format and provides critical timing signals in CMOS logic, ensuring accurate sync extraction and minimal jitter.
Key Specifications
| Parameter | Value |
|---|---|
| Package Type | 14-pin TSSOP |
| Operating Temperature Range | −40°C to +85°C |
| Supply Voltage Range | 3.3V to 5.0V |
| Supply Current (Max) | 13.5 mA |
| Technology | CMOS |
| Terminal Finish | MATTE TIN |
| Terminal Form | GULL WING |
| Terminal Pitch | 0.65 mm |
| Length | 5.0 mm |
| Width | 4.4 mm |
| Seated Height (Max) | 1.2 mm |
| Peak Reflow Temperature | 260°C |
Key Features
- Automatic detection of input video format, eliminating the need for microcontroller programming.
- Precise 50% sync slicing for accurate sync extraction, even with irregular input amplitudes.
- Outputs include Composite, Horizontal, and Vertical Syncs, Burst/Back Porch Timing, Odd/Even Field, and Video Format Outputs in CMOS logic.
- Very low jitter on the leading edge of HSync, minimizing the need for external jitter reduction circuitry.
- Unique Video Format Output providing an 11-bit binary serial data stream indicating the total horizontal line count per field.
- Support for bi-level and tri-level sync inputs.
- Compliance with various video standards including NTSC, PAL, SMPTE 170M, ITU-R BT.470, SMPTE 125M, and more.
Applications
- Broadcast and professional video equipment.
- HDTV/DTV systems.
- Genlock circuits.
- Video capture devices.
- Set-top boxes (STB) and digital video recorders (DVR).
- Video displays.
Q & A
- What is the primary function of the LMH1981MTX/NOPB?
The LMH1981MTX/NOPB is a multi-format video sync separator, designed to extract timing information from various video formats and output critical timing signals in CMOS logic.
- What types of video formats does the LMH1981MTX/NOPB support?
The LMH1981MTX/NOPB supports a wide range of video formats including NTSC, PAL, SMPTE 170M, ITU-R BT.470, SMPTE 125M, and others.
- What is the operating temperature range of the LMH1981MTX/NOPB?
The operating temperature range is −40°C to +85°C.
- What is the supply voltage range for the LMH1981MTX/NOPB?
The supply voltage range is 3.3V to 5.0V.
- What type of package does the LMH1981MTX/NOPB come in?
The LMH1981MTX/NOPB comes in a 14-pin TSSOP package.
- Does the LMH1981MTX/NOPB require external programming for video format detection?
No, the LMH1981MTX/NOPB automatically detects the input video format without the need for external programming.
- What is the significance of the 50% sync slicing feature in the LMH1981MTX/NOPB?
The 50% sync slicing feature ensures accurate sync extraction even for inputs with irregular amplitudes due to improper termination or transmission loss.
- How does the LMH1981MTX/NOPB minimize jitter in subsequent clock generation stages?
The LMH1981MTX/NOPB features very low jitter on the leading edge of HSync, minimizing the need for external circuitry to clean and reduce jitter.
- What is the purpose of the Video Format Output in the LMH1981MTX/NOPB?
The Video Format Output provides an 11-bit binary serial data stream indicating the total horizontal line count per field, enabling dynamic adjustment of system parameters.
- Is the LMH1981MTX/NOPB compliant with RoHS and REACH regulations?
