ADG901/ADG902

Rev. B | Page 10 of 16

APPLICATIONS

The ADG901/ADG902 are ideal solutions for low power, high

frequency applications. The low insertion loss, high isolation

between ports, low distortion, and low current consumption of

these parts make them excellent solutions for many high

frequency switching applications.

Applications include switching between high frequency filters,

ASK generators, and FSK generators.

ABSORPTIVE vs. REFLECTIVE SWITCHES

The ADG901 is an absorptive (matched) switch with

50 Ω terminated shunt legs and the ADG902 is a reflective

switch with 0 Ω terminated shunts to ground. The ADG901

absorptive switch has a good VSWR on each port, regardless of

the switch mode. An absorptive switch should be used when

there is a need for a good VSWR that is looking into the port

but not passing the through signal to the common port. The

ADG901 is therefore ideal for applications that require

minimum reflections back to the RF source. It also ensures that

the maximum power is transferred to the load.

The ADG902 reflective switch is suitable for applications where

high off port VSWR does not matter and the switch has some

other desired performance feature. It can be used in many

applications, including high speed filter selection. In most cases,

an absorptive switch can be used instead of a reflective switch,

but not vice versa.