Product Specification

SP4272

Page 3 of 10

Control Voltages

Signal Path

Pin 2 (CTRL) = High

RFC to RF1

Pin 2 (CTRL) = Low

RFC to RF2

Table 5. Single-pin Control Logic Truth Table

Table 6. Complementary-pin Control Logic

Truth Table

Control Voltages

Signal Path

Pin 2 (CTRL) = High

RFC to RF1

Pin 2 (CTRL) = Low

RFC to RF2

Control Logic Input

The SP4272 is a versatile RF CMOS switch that

supports two operating control modes; single-pin

control mode and complementary-pin control

mode.

Single-pin control mode enables the switch to

operate with a single control pin (pin 2) supporting

a +3-volt CMOS logic input, and requires a

dedicated +3-volt power supply connection (pin 1).

This mode of operation reduces the number of

control lines required and simplifies the switch

control interface typically derived from a CMOS

µProcessor I/O port.

Complementary-pin control mode allows the

switch to operate using complementary control

directly driven by +3-volt CMOS logic or a suitable

µProcessor I/O port. This enables the PE4272 to

operate in positive control voltage mode within the

SP4272 operating limits.

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