0 Hz to 4.5 GHz, 40 dB Off Isolation at 1 GHz,

17 dBm P1dB at 1 GHz SPST

Switches

Data Sheet

ADG901/ADG902

Rev. D

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FEATURES

ADG901 absorptive switch

ADG902 reflective switch

Enables user to pass dc signals up to 0.5 V without dc

blocking capacitor

Operational from 0 Hz up to 4.5 GHz at −3 dB frequency

40 dB off isolation at 1 GHz typical

0.8 dB insertion loss at 1 GHz typical

17 dBm P1dB at 1 GHz typical

Available in 3 mm × 3 mm, 8-lead MSOP and 8-lead LFCSP

<1 μA power consumption

CMOS/LVTTL control logic

Specified at 1.65 V to 2.75 V

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 list

FUNCTIONAL BLOCK DIAGRAMS

ADG901

RF2

RF1

CTRL

50Ω

50Ω

Figure 1. ADG901

ADG902

RF2

RF1

CTRL

Figure 2. ADG902

GENERAL DESCRIPTION

The ADG901/ADG902 are wideband switches that use a comple-

mentary metal-oxide semiconductor (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. These switches enable the user to pass dc signals up to 0.5 V

without the use of a dc blocking capacitor. 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 applications and

general-purpose high frequency switching.

PRODUCT HIGHLIGHTS

1.

40 dB Off Isolation at 1 GHz

2.

0.8 dB Insertion Loss at 1 GHz

3.

17 dBm P1dB at 1 GHz

0

–100

–90

–80

–70

–60

–50

–40

–30

–20

–10

10k

100k

100M

1M

10M

1G

10G

FREQUENCY (Hz)

VDD = 2.5V

VDD = 1.8V

TA = 25C

Figure 3. Off Isolation vs. Frequency