Overview
The LMH0344SQE/NOPB, produced by Texas Instruments, is a 3-Gbps HD–SD SDI Adaptive Cable Equalizer. This device is designed to equalize data transmitted over cable or any media with similar dispersive loss characteristics, operating over a wide range of data rates from 125 Mbps to 2.97 Gbps. It supports various SMPTE standards including ST 424, ST 292, ST 344, and ST 259. The equalizer features DC restoration, automatic equalization control, and separate carrier detect and output mute pins, making it versatile for various video transmission applications.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Supply Voltage | 3.3 | V |
| Input Voltage Range | −0.3 to VCC+0.3 | V |
| Junction Temperature | −40 to 85 | °C |
| Lead Temperature (Soldering 4 seconds) | 260 | °C |
| Storage Temperature | −65 to 150 | °C |
| Data Rate Range | 125 Mbps to 2.97 Gbps | |
| Input Configuration | Single-ended or Differential | |
| Output Configuration | 50-Ω Differential Outputs | |
| Power Consumption | 280 mW (Typical) | |
| ESD Rating (HBM) | ±8000 V |
Key Features
- Equalizes up to 120 meters of Belden 1694A at 2.97 Gbps with 0.3 UI maximum output jitter.
- Manual bypass and output mute with a programmable threshold.
- Single-ended or differential input configuration.
- 50-Ω differential outputs with internal 50-Ω pull-ups.
- Single 3.3-V supply operation.
- DC restoration and level control.
- Automatic equalization control.
- Carrier detect and output mute pins.
- Programmable mute reference.
Applications
The LMH0344SQE/NOPB is primarily used in professional video transmission systems, including broadcast, post-production, and live event applications. It is suitable for equalizing data transmitted over long cables in HD-SDI and SD-SDI systems, ensuring high-quality video signal integrity. The device can be integrated into various video equipment such as video routers, switchers, and transmission systems.
Q & A
- What is the primary function of the LMH0344SQE/NOPB? The primary function is to equalize data transmitted over cable or media with similar dispersive loss characteristics, ensuring signal integrity in HD-SDI and SD-SDI systems.
- What data rates does the LMH0344SQE/NOPB support? It supports data rates from 125 Mbps to 2.97 Gbps.
- Which SMPTE standards does the LMH0344SQE/NOPB support? It supports ST 424, ST 292, ST 344, and ST 259.
- What is the input configuration of the LMH0344SQE/NOPB? It accepts either single-ended or differential inputs.
- How does the LMH0344SQE/NOPB handle DC restoration? It incorporates a self-biasing DC restoration circuit to fully DC restore the signals.
- What is the purpose of the bypass pin? The bypass pin allows the adaptive equalizer to be bypassed, disabling equalization and DC restoration.
- How does the carrier detect feature work? The carrier detect pin indicates if a valid signal is present at the input, and it can be tied to the mute pin to automatically mute the output when no signal is present.
- What is the typical power consumption of the LMH0344SQE/NOPB? The typical power consumption is 280 mW.
- What is the ESD rating of the LMH0344SQE/NOPB? The ESD rating is ±8000 V (HBM).
- What type of output does the LMH0344SQE/NOPB produce? It produces 50-Ω differential outputs with internal 50-Ω pull-ups.
- Can the LMH0344SQE/NOPB be used in both HD and SD video systems? Yes, it supports both HD-SDI and SD-SDI systems.
