Wideband, 37 dB Isolation at 1 GHz,

CMOS 1.65 V to 2.75 V, 4:1 Mux/SP4T

ADG904/ADG904-R

Rev. 0

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FEATURES

Wideband switch: –3 dB @ 2.5 GHz

ADG904: Absorptive 4:1 Mux/SP4T

ADG904-R: Reflective 4:1 Mux/SP4T

High off isolation (37 dB @ 1 GHz)

Low insertion loss (1.1 dB dc to 1 GHz)

Single 1.65 V to 2.75 V power supply

CMOS/LVTTL contol logic

20-lead TSSOP

Low power consumption (1 µA max)

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

ADG904

50

Ω

50

Ω

50

Ω

50

Ω

1 OF 4 DECODER

RFC

A0

A1

EN

RF1

RF2

RF3

RF4

ADG904-R

1 OF 4 DECODER

RFC

A0

A1

EN

RF1

RF2

RF3

RF4

Figure 1

Figure 2

GENERAL DESCRIPTION

The ADG904/ADG904-R are wideband analog 4:1multiplexers

that use a CMOS process to provide high isolation and low

insertion loss to 1 GHz. The ADG904 is an absorptive/matched

mux with 50 Ω terminated shunt legs; the ADG904-R is a

reflective mux. These devices are designed such that the isola-

tion is high over the dc to 1 GHz frequency range.

The ADG904/ADG904-R switches one of four inputs to a

common output, RFC, as determined by the 3-bit binary

address lines A0, A1, and EN. A Logic 1 on the EN pin disables

the device.

The parts have on-board CMOS control logic, thus eliminating

the need for external control circuitry. The control inputs are

both CMOS and LVTTL compatible. The ADG904/ADG904-R’s

low power consumption makes them ideally suited for wireless

applications and general-purpose high frequency switching.

PRODUCT HIGHLIGHTS

1.

–37 dB off isolation @ 1 GHz

2.

1.1 dB insertion loss @ 1 GHz

3.

20-lead TSSOP packages

FREQUENCY (Hz)

10G

10k

100k

1M

10M

100M

1G

–10

–20

–30

–40

–50

–60

–70

–80

S12

S21

FREQUENCY (Hz)

10G

10k

100k

1M

10M

100M

1G

–0.3

–0.4

–0.5

–0.6

–0.7

–0.8

–0.9

–1.0

–1.1

–1.2

–1.3

–1.4

–1.5

–1.6

–1.7

–1.8

–1.9

–2.0

–2.1

–2.2

–2.3

–2.4

–2.5

–2.6

–2.7

–2.8

–2.9

–3.0

Figure 3. Off Isolation vs. Frequency

Figure 4. Insertion Loss vs. Frequency