Overview
The LMH0034MA is an adaptive cable equalizer integrated circuit designed by Texas Instruments, although it is often associated with National Semiconductor due to historical mergers and acquisitions. This component is specifically tailored for equalizing data transmitted over cable, complying with SMPTE 292M, SMPTE 259M, and DVB-ASI standards. It supports data rates from 125 Mbps to 1.485 Gbps, making it versatile for various high-definition and standard-definition video applications.
Key Specifications
| Parameter | Value | Units |
|---|---|---|
| Max Data Rate | 1485 | Mbps |
| Operating Temperature Range | 0 to 85 | °C |
| Supply Voltage | 3.3 | V |
| Package Type | 16-SOIC | |
| Input Voltage Swing | 720 to 950 | mV-P-P |
| Output Voltage Swing (50Ω load, differential) | 750 | mV-P-P |
| Supply Current | 63 to 77 | mA |
| ESD HBM | 8 | kV |
Key Features
- Supports SMPTE 292M, SMPTE 259M, and DVB-ASI standards.
- Equalizes up to 200 meters of Belden 1694A cable at 1.485 Gbps or up to 400 meters at 270 Mbps.
- Manual bypass, cable length indicator, and output mute with a programmable threshold.
- Single-ended or differential input drive capability.
- 50Ω differential outputs.
- Combined carrier detect and output mute pin.
- DC restoration to handle pathological data conditions.
- Single 3.3V supply operation.
- Typical power consumption of 208 mW with 3.3V supply.
Applications
The LMH0034MA is primarily used in video transmission systems, including:
- High-definition and standard-definition serial digital video.
- SMPTE 292M and SMPTE 259M compliant systems.
- DVB-ASI applications.
- Professional video equipment such as broadcast cameras, switchers, and routers.
Q & A
- What is the maximum data rate supported by the LMH0034MA?
The LMH0034MA supports data rates up to 1.485 Gbps.
- What are the supported SMPTE standards for the LMH0034MA?
The LMH0034MA supports SMPTE 292M and SMPTE 259M standards.
- What is the typical power consumption of the LMH0034MA?
The typical power consumption is 208 mW with a 3.3V supply.
- Can the LMH0034MA handle both single-ended and differential inputs?
- What is the purpose of the cable length indicator in the LMH0034MA?
The cable length indicator provides a voltage inversely proportional to the cable length being equalized.
- How does the LMH0034MA handle pathological data conditions?
The LMH0034MA implements DC restoration to correctly handle pathological data conditions.
- What is the operating temperature range of the LMH0034MA?
The operating temperature range is from 0°C to 85°C.
- Is the LMH0034MA RoHS compliant?
- What package type is the LMH0034MA available in?
The LMH0034MA is available in a 16-SOIC package.
- Can the LMH0034MA replace other equalizers like the Gennum GS1524?
