1

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

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400MHz Multiplexing Amplifier

ISL59420

The ISL59420 is a 420MHz bandwidth 2:1 multiplexing

amplifier designed primarily for video switching. This Mux-amp

has user-settable gain and also feature a high speed three-state

function to enable the output of multiple devices to be wired

together. All logic inputs have pull-downs to ground and may be

left floating. The ENABLE pin, when pulled high, sets the

ISL59420 to the low current power-down mode for power

sensitive applications - consuming just 5mW.

Related Literature

•See AN1187, “ISL59420/21EVAL1 Evaluation Board User’s

Guide”

Features

• Selectable Gain

• High Speed Three-State Output (HIZ)

• Low Current Power-Down . . . . . . . . . . . . . . . . . . . . . . . . . 5mW

• Pb-Free (RoHS Compliant)

Applications

• HDTV/DTV Analog Inputs

• Video Projectors

•Computer Monitors

•Set-Top Boxes

•Security Video

• Broadcast Video Equipment

TABLE 1. CHANNEL SELECT LOGIC TABLE

S0

ENABLE

HIZ

OUTPUT

000

IN0

100

IN1

X1X

Power Down

X0

1

High Z

FIGURE 1. FUNCTIONAL DIAGRAM

OUT

DECODE

IN0

IN1

S0

ENABLE

EN0

EN1

HIZ

AMPLIFIER BIAS

+

-

IN-

ENABLE pin must be low in order to activate the HIZ state

July 3, 2012

FN7459.2