330MHz Buffered Video Switches Crosspoint Building Blocks

The MAX4111/MAX4121/MAX4221 wideband video switches are optimized for high-definition, broadcast-quality, composite (HDTV, NTSC, PAL, SECAM, and RGB) video switching arrays. Their open-loop buffer amplifiers offer 0.1dB gain flatness to 150MHz. They operate from ±5V supplies and feature differential phase and gain error of only 0.01°/0.01%, respectively. The ultra-low switching glitch (13mV) is positive to avoid confusion with any sync pulse.

Ideal as building blocks in large arrays, these devices feature a constant, high input impedance and a disable function that puts the outputs into a high-impedance state and reduces the operating current to only 250µA. The open-loop architecture allows the outputs to drive capacitive loads without oscillation. Other key features include -92dB crosstalk and -78dB isolation (MAX4121).

The MAX4111/MAX4121/MAX4221 are offered in narrow plastic DIP and SO packages. See the table below for key features:

Part

Description

Pins

MAX4111

SPST, single-input, single-output switch

8

MAX4121

SPDT, 2-input, single-output switch

8

MAX4221

Dual, SPDT, 2-input, single-output switch

16

Applications

* Broadcast/HDTV-Quality Color Signal Multiplexing * Data Acquisition * Graphics Color-Signal Routing * RF and IF Routing * Telecom Routing * Video-Router and Crosspoint Arrays

* -3dB Bandwidth of 330MHz

* 0.1dB Gain Flatness of 150MHz

* 700V/µs Slew Rate

* 0.01°/0.01% Differential Phase/Gain

* Low Power: 5.5mA Max

* -92dB Crosstalk and -78dB Off Isolation at 30MHz

* High-Z Outputs when Disabled

* 3pF Input Capacitance

* Ultra-Low Switching Glitch

* On-Board Control Logic