SP3T PIN Diode Switch

Rev. V1

MSW310x-310

7

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SP3T Switch Evaluation Board Schematic

SP3T Switch Evaluation Board Description

Below is the description of MSW310x-310 SP3T

series

shunt

switch

module

control

using

MPD3T28125-701 three channel pin diode driver.

The switch module can also be controlled by using

external

voltage

sources

accordingly.

The

MSW310x-310 series shunt three throw switch can

be fully controlled using MPD3T28125-701 three

channel pin diode driver. Each driver section is

connected to bias the series diode and the shunt

diode of the switch arms. For example, in the

configuration described below for the control of a

symmetrical SP3T switch, driver output V1A biases

the series diode connected between switch ports

J0 and J1, the driver output V1B biases the shunt

diode connected between switch ports J1 and B1.

Similarly driver output V2A biases the series diode

connected between switch ports J0 and J2, output

V2B biases the shunt diode connected between

switch ports J2 and B2 and output V3A biases the

series diode connected between switch ports J0

and J3, the driver output V3B biases the shunt

diode connected between switch ports J3 and B3.

A typical symmetric switch with a driver interface is

shown below. In this circuit, the MPD3T28125-701

driver is used to control the MSW3100-310

symmetrical SP3T switch. The switch is controlled

to operate in one of three operational states, which

are called State 1, State 2 and State 3. In the

descriptions of States 1, 2 and 3 (below), it is

assumed that +VCC1 = 5 V and + VCC2 = 28 V.