Wideband 4 GHz, 43 dB Isolation at 1 GHz,

CMOS 1.65 V to 2.75 V, 2:1 Mux/SPDT

ADG918/ADG919

Rev. C

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FEATURES

Wideband switch: −3 dB @ 4 GHz

Absorptive/reflective switches

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

8-lead MSOP and tiny 3 mm × 3 mm LFCSP packages

Low power consumption (<1 μA)

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

FUNCTIONAL BLOCK DIAGRAMS

RF2

RF1

CTRL

ADG918

RFC

50Ω

50Ω

ADG919

RF2

RF1

CTRL

RFC

Figure 1.

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

LVTTL compatible. The low power consumption of these

CMOS devices makes them ideally suited to wireless and

general-purpose high frequency switching applications.

PRODUCT HIGHLIGHTS

1.

–43 dB off isolation @ 1 GHz.

2.

0.8 dB insertion loss @ 1 GHz.

3.

Tiny 8-lead MSOP/LFCSP packages.

FREQUENCY (Hz)

10k

100k

1M

10M

100M

1G

10G

–100

–90

–70

–60

–50

–40

–30

–80

–20

–10

0

S21

S12

Figure 2. Off Isolation vs. Frequency

FREQUENCY (Hz)

10k

100k

1M

10M

100M

1G

10G

–3.2

–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 3. Insertion Loss vs. Frequency