Overview
The LMH1218 device, produced by Texas Instruments, is a low-power cable driver with an integrated reclocker designed to drive serial video data compatible with various standards including SMPTE-SDI, SMPTE 2022-5/6, 10GbE Ethernet, and DVB-ASI. This component supports data rates up to 11.88 Gbps, enabling Ultra High Definition Video for 4K and 8K applications. It features 75-Ω and 50-Ω transmitter outputs, allowing for multiple media options such as coax, fiber, and FR-4 PCB. The integrated 2:1 MUX input and 1:2 demux/fanout outputs provide flexibility in signal routing and selection between two video sources. The device also includes a programmable equalizer to compensate for printed-circuit board loss and extend signal reach.
Key Specifications
| Parameter | Description | Value |
|---|---|---|
| Data Rates | Supported data rates | 11.88 Gbps, 5.94 Gbps, 2.97 Gbps, 1.485 Gbps, 270 Mbps, 10.3125 Gbps |
| Transmitter Outputs | Output impedance | 75-Ω and 50-Ω |
| Input MUX | Input multiplexer configuration | 2:1 MUX |
| Output Configuration | Output demux/fanout configuration | 1:2 fanout |
| Power Consumption | Typical power dissipation | 300 mW (locked 75 Ω OUT0 only), 195 mW (locked OUT1 only) |
| Supply Voltage | Single supply voltage | 2.5 V |
| Operating Temperature | Operating temperature range | –40°C to +85°C |
| Package | Package type and size | WQFN (24 pins), 4 mm × 4 mm |
Key Features
- Integrated Reclocker: Automatically detects and locks to serial data from 270 Mbps to 11.88 Gbps without an external reference clock or loop filter component.
- Programmable Equalizer: Compensates for printed-circuit board loss to extend signal reach.
- Automatic Slew Rate: Adjusts based on input rate detection.
- On-Chip Eye Monitor: Allows for real-time measurement of serial data to simplify system start-up or field tuning.
- Low Power Consumption: 300 mW typical power dissipation with automatic power down on loss of input signal.
- Programmable Interface: Can be programmed using SPI or SMBus Interface.
- Multiple Media Options: Supports coax, fiber, and FR-4 PCB through 75-Ω and 50-Ω transmitter outputs.
Applications
- UHDTV/4K/8K/HDTV/SDTV Video: Supports high-definition video transmission.
- Digital Video Routers and Switches: Used in video routing and switching systems.
- Digital Video Processing and Editing: Suitable for video processing and editing equipment.
- DVB-ASI and Distribution Amplifiers: Compatible with DVB-ASI standards and distribution amplifiers.
- 10GbE for SMPTE 2022-5/6: Supports 10GbE Ethernet for SMPTE 2022-5/6 applications.
Q & A
- What are the supported data rates for the LMH1218?
The LMH1218 supports data rates of 11.88 Gbps, 5.94 Gbps, 2.97 Gbps, 1.485 Gbps, 270 Mbps, and 10.3125 Gbps.
- What types of transmitter outputs does the LMH1218 have?
The LMH1218 has 75-Ω and 50-Ω transmitter outputs.
- Does the LMH1218 require an external reference clock?
No, the LMH1218 does not require an external reference clock due to its integrated reclocker.
- How is the LMH1218 powered?
The LMH1218 operates on a single 2.5-V supply voltage.
- What is the typical power consumption of the LMH1218?
The typical power consumption is 300 mW when locked to 75 Ω OUT0 only and 195 mW when locked to OUT1 only.
- What is the operating temperature range of the LMH1218?
The operating temperature range is –40°C to +85°C.
- What package type and size does the LMH1218 come in?
The LMH1218 comes in a WQFN package with 24 pins and measures 4 mm × 4 mm.
- Can the LMH1218 be programmed?
Yes, the LMH1218 can be programmed using SPI or SMBus Interface.
- What is the purpose of the integrated eye monitor in the LMH1218?
The integrated eye monitor allows for real-time measurement of serial data to simplify system start-up or field tuning.
- What are some common applications of the LMH1218?
The LMH1218 is used in UHDTV/4K/8K/HDTV/SDTV video, digital video routers and switches, digital video processing and editing, DVB-ASI and distribution amplifiers, and 10GbE for SMPTE 2022-5/6 applications.
