Data Sheet

ADRF5440

THEORY OF OPERATION

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Rev. A | 13 of 18

The ADRF5440 integrates a driver to perform logic functions inter-

nally and provides the user with the advantage of a simplified

CMOS-/LVTTL-compatible control interface. This driver features two

digital control input pins, V1 and V2. The logic level applied to the

control pins determine which RF port is in the insertion loss state

and in the isolation state (see Table 7).

Table 7. Control Voltage Truth Table

Digital Control Inputs

RFx Paths

V1

V2

RFC to RF1

RFC to RF2

RFC to RF3

RFC to RF4

Low

Low

Insertion loss (on)

Isolation (off)

Isolation (off)

Isolation (off)

High

Low

Isolation (off)

Insertion loss (on)

Isolation (off)

Isolation (off)

Low

High

Isolation (off)

Isolation (off)

Insertion loss (on)

Isolation (off)

High

High

Isolation (off)

Isolation (off)

Isolation (off)

Insertion loss (on)