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General Description

The MAX4028/MAX4029 are 5V, triple/quad, 2:1 voltage feedback multiplexer-amplifiers with input clamps and a fixed gain of +2V/V (6dB). Channel 1 (IN1A and IN1B) inputs are clamped to the video sync tip of the input signal, while the remaining inputs can be clamped to either the video sync tip or the video sync of channel 1 (IN1_). The latter is referred to as a key clamp and is pin selectable. Selectable clamp/key-clamp inputs and fixed gain video output buffers make the MAX4028/MAX4029 ideal for video-source switching applications such as entertainment systems, video projectors, and displays/TVs. Both devices have 20ns channel switching times and low ±10mVP-P switching transients, making them ideal for high-speed video switching applications such as on-screen display (OSD) insertion.

Features

● Single +5V Operation

● Independently Selectable Sync-Tip or Key-Clamp Inputs

● Adjustable Key-Clamp Voltage

● 130MHz Large-Signal -3dB Bandwidth

● 210MHz Small-Signal -3dB Bandwidth

● 300V/μs Slew Rate

● 20ns Switching Time

● Ultra-Low ±10mVP-P Switching Transient

● 0.2 Differential Gain/0.4° Phase Error

● Low-Power, High-Impedance Disable Mode

Applications

● Blade Servers

● Security Systems

● Video Projectors

● Displays and Digital Televisions

● Broadcast and Graphics Video

● Set-Top Boxes

● Notebook Computers

● Video Crosspoint Switching