MAX9542

Quadruple, 2:1, Mux Amplifiers for Standard Definition and VGA Signals

Support Routing and Filtering of VGA and Standard-Definition Video Signals

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Overview

Quad 2:1 Video Mux Amplifiers
Reconstruction Filters with 9.5MHz Passband and 47dB Attenuation at 27MHz (MAX9541)
Fixed Gain of 2V/V
Input Sync-Tip Clamps
Shutdown
2.7V to 3.6V Single-Supply Operation

The MAX9541/MAX9542 are quadruple-channel, 2:1 video mux amplifiers with input sync tip clamps. These devices select between two video sources and support up to four channels on each source. The MAX9541 has integrated lowpass filters that are optimized for standard-definition video signals such as composite and red, green, blue (RGB). The filters typically have ±1dB passband flatness out to 9.5MHz and 47dB attenuation at 27MHz. The MAX9542 has a wider bandwidth of 15MHz because it does not have integrated lowpass filters, making it suitable for not only standard-definition video signals, but also video graphics array (VGA) signals with a 640 x 480 resolution at up to 85Hz refresh rate.

Video signals are AC-coupled to the inputs of the MAX9541/MAX9542. The input sync-tip clamps set the internal DC level.

The amplifiers have 2V/V gain, and the outputs can be DC-coupled to a 75Ω load, which is the equivalent of two video loads, or AC-coupled to a 150Ω load.

Both the MAX9541/MAX9542 feature a low-power shutdown mode, in which supply current is reduced to 35µA.

Applications