Wideband, 40 dB Isolation at 1 GHz, CMOS
1.65 V to 2.75 V, SPST Switches
ADG901/ADG902
FUNCTIONAL BLOCK DIAGRAMS
ADG901
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
RF1
RF2
50ꢀ
50ꢀ
8-Lead MSOP and Tiny 3 mm ꢁ 3 mm LFCSP Packages
Low Power Consumption (<1 ꢂA)
CTRL
RF1
APPLICATIONS
ADG902
Wireless Communications
General-Purpose RF Switching
Dual-Band Applications
High Speed Filter Selection
Digital Transceiver Front End Switch
IF Switching
RF2
CTRL
Tuner Modules
Antenna Diversity Switching
GENERAL DESCRIPTION
LVTTL compatible. The low power consumption of these
CMOS devices makes them ideally suited to wireless applica-
tions and general-purpose high frequency switching.
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
PRODUCT HIGHLIGHTS
1. –40 dB Off Isolation @ 1 GHz
2. 0.8 dB Insertion Loss @ 1 GHz
3. Tiny 8-Lead MSOP/LFCSP Packages
0
–0.4
–0.6
–0.8
–1.0
–1.2
–1.4
–1.6
–1.8
–2.0
–2.2
–2.4
–2.6
T
= 25ꢃC
A
–10
–20
–30
–40
–50
–60
–70
–80
V
= 2.5 V
DD
V
T
= 2.5V
= 25ꢃC
DD
A
–90
–2.8
V
= 1.8 V
DD
–100
–3.0
10k
10k
100k
1M
10M
100M
1G
10G
100k
1M
10M
100M
1G
10G
FREQUENCY (Hz)
FREQUENCY (Hz)
Figure 2. Insertion Loss vs. Frequency
Figure 1. Off Isolation vs. Frequency
REV. A
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