Wideband 4 GHz, 43 dB Isolation at 1 GHz,
CMOS 1.65 V to 2.75 V, 2:1 Mux/SPDT
ADG918/ADG919
FUNCTIONAL BLOCK DIAGRAMS
FEATURES
Wideband switch: −3 dB @ 4 GHz
Absorptive/reflective switches
ADG918
RF1
High off isolation (43 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
RFC
50Ω
RF2
CTRL
8-lead MSOP and tiny 3 mm × 3 mm LFCSP packages
Low power consumption (<1 μA)
50Ω
APPLICATIONS
ADG919
Wireless communications
General-purpose RF switching
Dual-band applications
High speed filter selection
Digital transceiver front end switch
IF switching
RF1
RF2
RFC
CTRL
Tuner modules
Figure 1.
Antenna diversity switching
LVTTL compatible. The low power consumption of these
CMOS devices makes them ideally suited to wireless and
general-purpose high frequency switching applications.
GENERAL DESCRIPTION
The ADG918/ADG919 are wideband switches using a CMOS
process to provide high isolation and low insertion loss to
1 GHz. The ADG918 is an absorptive (matched) switch having
50 Ω terminated shunt legs, whereas the ADG919 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. –43 dB off isolation @ 1 GHz.
2. 0.8 dB insertion loss @ 1 GHz.
3. Tiny 8-lead MSOP/LFCSP packages.
–0.4
–0.6
–0.8
–1.0
–1.2
–1.4
–1.6
–1.8
–2.0
–2.2
–2.4
–2.6
0
V
= 2.5V
DD
= 25°C
–10
–20
–30
–40
–50
–60
–70
–80
T
A
S12
–2.8
–3.0
–3.2
V
T
= 2.5V
= 25°C
DD
S21
–90
A
–100
10k
100k
1M
10M
100M
1G
10G
10k
100k
1M
10M
100M
1G
10G
FREQUENCY (Hz)
FREQUENCY (Hz)
Figure 3. Insertion Loss vs. Frequency
Figure 2. Off Isolation vs. Frequency
Rev. C
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