REV. A

Wideband, 40 dB Isolation at 1 GHz, CMOS

1.65 V to 2.75 V, SPST Switches

ADG901/ADG902

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FUNCTIONAL BLOCK DIAGRAMS

RF2

CTRL

ADG901

RF1

50

50

RF2

CTRL

ADG902

RF1

FEATURES

Wideband Switch: –3 dB @ 4.5 GHz

Absorptive/Reflective Switches

High Off Isolation (40 dB @ 1 GHz)

Low Insertion Loss (0.8 dB @1 GHz)

Single 1.65 V to 2.75 V Power Supply

CMOS/LVTTL Control Logic

8-Lead MSOP and Tiny 3 mm

3 mm LFCSP Packages

Low Power Consumption (<1

A)

APPLICATIONS

Wireless Communications

General-Purpose RF Switching

Dual-Band Applications

High Speed Filter Selection

Digital Transceiver Front End Switch

IF Switching

Tuner Modules

Antenna Diversity Switching

FREQUENCY (Hz)

10k

100k

1M

10M

100M

1G

10G

–100

–90

–70

–60

–50

–40

–30

–80

–20

–10

0

Figure 1. Off Isolation vs. Frequency

FREQUENCY (Hz)

10k

100k

1M

10M

100M

1G

10G

–2.8

–2.6

–2.4

–2.2

–1.8

–1.6

–1.4

–1.2

–1.0

–2.0

–3.0

–0.8

–0.6

–0.4

Figure 2. Insertion Loss vs. Frequency

GENERAL DESCRIPTION

The ADG901/ADG902 are wideband switches that use a

CMOS process to provide high isolation and low insertion loss to

1 GHz. The ADG901 is an absorptive (matched) switch with

50

Ω terminated shunt legs, while the ADG902 is a reflective

switch. These devices are designed such that the isolation is

high over the dc to 1 GHz frequency range. They have on-board

CMOS control logic, thus eliminating the need for external

controlling circuitry. The control inputs are both CMOS and

LVTTL compatible. The low power consumption of these

CMOS devices makes them ideally suited to wireless applica-

tions and general-purpose high frequency switching.

PRODUCT HIGHLIGHTS

1. –40 dB Off Isolation @ 1 GHz

2. 0.8 dB Insertion Loss @ 1 GHz

3. Tiny 8-Lead MSOP/LFCSP Packages