ADG918/ADG919
a
REV. PrC Sept 2002
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Wideband, 43dB Isolation @ 1GHz,
CMOS 1.65 V to 2.75V, 2:1 Mux/SPDT Switches
Preliminary Technical Data
PRELIMINARY TECHNICAL DATA
FEATURES
Wideband DC to 2GHz
ADG918/ADG919 Absorptive/Reflective Switches
High Off Isolation (43 dB @ 1 GHz)
Low Insertion Loss (1 dB DC to 900 MHz)
Single 1.65 to 2.75 V power supply
CMOS/LVTTL Control Logic
8 Lead MSOP & Tiny 3 x 3mm CSP Packages
Low Power Consumption (5µA)
APPLICATIONS
Wireless Communications
General Purpose RF switching
Dual Band Applications
Filter Selection
Antenna Switch
Digital Transceiver Front-End Switch
IF Switching
GENERAL DESCRIPTION
The ADG918/ADG919 are wideband switches using a
CMOS process to provide high isolation and low insertion
loss to 1GHz. The ADG918 is an absorptive switch
having 50 ohm terminated shunt legs, while the ADG919
is a reflective switch. These devices are designed such that
the isolation is high over the DC to 1GHz 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 applications
and general purpose high frequency switching.
FUNCTIONAL BLOCK DIAGRAM
Table 1. Truth Table
Control Signal Path
0 RF2 to RF Common
1 RF1 to RF Common
Figure 2. Loss vs Frequency
Figure 1. Isolation vs Frequency
RF2
RF1
CONTROL
ADG918
RF COMMON
50Ω
50Ω
RF2
RF1
CONTROL
ADG919
RF COMMON