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SDT215

N-CHANNEL LATERAL DMOS SWITCH

Linear Technology 

High-Speed DMOS FET Analog Switches and Switch Arrays

Introduction

This Application Note describes in detail the

principle of operation of the SD210/5000 series

of high-speed analog switches and switch

arrays. It contains an explanation of the most

important switch characteristics, application

examples, test data, and other application hints.

Description

The Linear Systems SD210 and SD5000 series

are discretes and quad monolithic arrays,

respectively, of single-pole single-throw analog

switches. These switches are n-channel

enhancement-mode silicon field effect

transistors built using double-diffusion MOS

(DMOS) silicon gate technology. Surface-

mount versions (SST211, SD5400 Series) are

also available.

This family of devices is designed to handle a

wide variety of video, fast ATE, and telecom

analog switching applications. They are capable

of ultrafast switching speeds (tr = 1 ns, tOFF = 3

ns) and excellent transient response. Thanks to

the reduced parasitic capacitances, DMOS can

handle wideband signals with high off-isolation

and minimum crosstalk.

The SD210 series of single-channel FETs is

produced without Zener protection to reduce

leakage and in Zener protected versions to

reduce electrostatic discharge hazards. The

SD5000 series is available in 16-lead dual in-

line surface mount or sidebraze ceramic

packages. Analog signal voltage ranges up to

±10 V and frequencies up to 1 GHz can be

controlled.

For surface-mount applications the SST211

series is offered in the TO-253 (SOT-143)

package. The SD5400 series comes in the

narrow body gull-wing SO-14 package.

Applications

Fast switching speeds, low on-state resistance,

high channel-to-channel isolation, low

capacitance, and low charge injection make

these DMOS devices especially well suited for a

variety of applications.

A few of the many possible application areas for

DMOS analog switches are as follows:

1. Video and RF switching (high speed, high off-

isolation, low crosstalk):

-Multiple video distribution networks

-Sampling scanners for RF systems

2. Audio routing (glitch- and noise-free):

-High-speed switching

-Audio switching systems using

digitized remote control

3. Data acquisition (highspeed, low charge

injection, low leakage):

-High-speed sample-and-holds

-Audio and communication A/D

converters

4. Other:

-Digital switching

-PCM distribution networks

-UHF Amplifiers

-VHF Modulators and Double-Balanced

Mixers

-High-speed inverters/drivers

-Switched capacitor filters

-Choppers

1

Linear Integrated Systems, Inc. ● 4042 Clipper Ct. ● Fremont, CA 94538 ● Tel: 510 490-9160 ● Fax: 510 353-0261

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