ADG936/ADG936-R

Rev. 0 | Page 11 of 16

APPLICATIONS

The ADG936/ADG936-R 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. They can be used

in applications such as switchable filters, transmitters and

receivers for radar systems, and communication systems from

base stations to cell phones.

The ADG9xx family of wideband switches is designed to meet

the demands of devices transmitting at ISM band frequencies to

1 GHz and higher. The low insertion loss, high isolation

between ports, single pin control interface, no requirement for

dc blocking capacitors, and TTL interface compatibility make

them cost-effective and easy-to-integrate switching solutions for

many high frequency switching and low power applications,

because the parts can handle up to 16 dBm of power.

ABSORPTIVE VS. REFLECTIVE

The ADG936 is an absorptive (matched) switch with 50 Ω

terminated shunt legs; the ADG936-R is a reflective switch with

0 Ω terminated shunts to ground. The ADG936 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 ADG936

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 ADG936-R reflective switch is suitable for applications in

which high off-port VSWR does not matter, and the switch has

some other desired performance features. 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.

FILTER SELECTION

The ADG936 and ADG936-R can be used to switch high

frequency signals between different filters, and to multiplex the

signal to the output. These dual SPDT switches are also ideal for

high speed signal routing and for switching high speed

differential signals.

ADG936

ADG936

RF1A

RF2A

RF1B

RF2B

RF1A

RF2A

RF1B

RF2B

RFCA

RFCB

RFCB

RFCA

Figure 27. Filter Selection

Tx/Rx SWITCHING

The low insertion loss and high isolation between ports ensure

that the ADG936/ADG936-R are suitable transmit/receive

switches for all ISM band and Wireless LAN applications,

providing the required isolation between the transmit and

receive signals.

ANTENNA

ADG936

RF1B

RF2B

RF1B

RF2B

RFCB

RFCA

PA

LNA

Figure 28. Tx/Rx Switching

ANTENNA DIVERSITY SWITCH

The ADG936/ADG936-R are ideal for use as antenna diversity

switches, switching in different antennas to the tuner. The low

insertion loss, which ensures minimum signal loss and high

isolation between channels, makes these dual SPDT switches

suitable for switching applications in tuner modules and set-top

boxes.