1 Features
1• Supports ST 424 (3G), 292 (HD), and 259 (SD)
• Data Rates up to 2.97 Gbps
• Supports DVB-ASI at 270 Mbps
• Cable Detect on Output
• Loss of Signal Detect at Input
• Output Driver Power-Down Control
• Typical Power Consumption: 130 mW in SD Mode
and 155 mW in HD Mode
• Typical Power Consumption of the Power-Save
Mode: 4 mW
• Single 3.3-V Supply Operation
• 75-Ω Single-Ended Outputs
• 100-Ω Differential Input
• Selectable Slew Rate
• Industrial Temperature Range: −40°C to 85°C
• 16-Pin WQFN Package
• Footprint Compatible With the LMH0302

2 Applications
• ST 424, ST 292, ST 344, and ST 259 Serial
Digital Interfaces
• Digital Video Routers and Switches
• Distribution Amplifiers

3 Description
The LMH0303 device is designed for use in ST 424,
ST 292, ST 344, and ST 259 serial digital video
applications. The LMH0303 drives 75-Ω transmission
lines (Belden 1694A, Belden 8281, or equivalent) at
data rates up to 2.97 Gbps.
The LMH0303 includes intelligent sensing capabilities
to improve system diagnostics. The cable detect
feature senses near-end termination to determine if a
cable is correctly attached to the output BNC. Input
loss of signal (LOS) detects the presence of a valid
signal at the input of the cable driver. These sensing
features may be used to alert the user of a system
fault and activate a deep power-save mode, reducing
the power consumption of the cable driver to 4 mW.
These features are accessible through an SMBus
interface.
The LMH0303 provides two selectable slew rates for
ST 259 and ST 424 or 292. The output amplitude is
adjustable ±10% in 5-mV steps through the SMBus.
The LMH0303 is powered from a single 3.3-V supply.
Power consumption is typically 130 mW in SD mode
and 155 mW in HD mode. The LMH0303 is available
in a 16-pin WQFN package.