Overview
The LMH0303SQE/NOPB, produced by Texas Instruments, is a 3-Gbps HD/SD SDI cable driver designed for high-speed serial digital video data transmission applications. This device supports various standards including ST 424 (3G), ST 292, ST 344, and ST 259. It is capable of driving 75-Ω transmission lines at data rates up to 2.97 Gbps, making it suitable for professional video equipment and broadcast systems. The LMH0303 features intelligent sensing capabilities, including cable detect and loss of signal detection, which can be accessed through an SMBus interface to enhance system diagnostics and power management.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Data Rate | Up to 2.97 Gbps | Mbps |
| Output Slew Rate | Selectable for ST 259 and ST 424/292 compliance | |
| Output Voltage Swing | Adjustable ±10% in 5-mV steps | mV |
| Power Supply | Single 3.3 V | V |
| Power Consumption (SD Mode) | Typically 130 mW | mW |
| Power Consumption (HD Mode) | Typically 155 mW | mW |
| Package Type | 16-pin WQFN (4x4 mm) | |
| Cable Detect | Senses near-end termination | |
| Loss of Signal Detect | Detects presence of valid signal at input |
Key Features
- Supports ST 424 (3G), ST 292, ST 344, and ST 259 serial digital video standards
- Cable detect feature to sense near-end termination
- Loss of signal detection at the input
- Output driver power-down control for power saving
- Adjustable output voltage swing through SMBus or external resistor
- Selectable slew rates for compliance with different standards
- SMBus interface for configuration and diagnostics
- Low power consumption with deep power-save mode (4 mW)
Applications
The LMH0303SQE/NOPB is designed for use in various serial digital video applications, including:
- Professional video equipment
- Broadcast systems
- High-definition and standard-definition video transmission
- DVB-ASI at 270 Mbps
Q & A
- What is the maximum data rate supported by the LMH0303?
The LMH0303 supports data rates up to 2.97 Gbps. - What standards does the LMH0303 comply with?
The LMH0303 complies with ST 424 (3G), ST 292, ST 344, and ST 259 serial digital video standards. - How does the cable detect feature work?
The cable detect feature senses near-end termination to determine if a cable is correctly attached to the output BNC. - What is the purpose of the loss of signal detection?
The loss of signal detection detects the presence of a valid signal at the input of the cable driver. - How is the output voltage swing adjusted?
The output voltage swing is adjustable through a single external resistor (RREF) or via the SMBus interface in 5-mV steps. - What is the power consumption in SD and HD modes?
The power consumption is typically 130 mW in SD mode and 155 mW in HD mode. - What package type is the LMH0303 available in?
The LMH0303 is available in a 16-pin WQFN package. - How does the SMBus interface work?
The SMBus interface allows for the configuration and diagnostics of the device, including accessing control functions and detecting faults. - Can multiple LMH0303 devices share the same SMBus signals?
Yes, multiple LMH0303 devices can share the same SMBus signals, and each device can be assigned a unique address. - What is the typical power consumption in deep power-save mode?
The typical power consumption in deep power-save mode is 4 mW.
