Analog Devices ADG904 R Datasheet

Wideband, 37 dB Isolation at 1 GHz,

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

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 isola­tion 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

the device.

–10

VDD = 2.5V

–20

–30

–40

–50

–60

INSERTION LOSS (dB)

–70

–80

Figure 3. Off Is olation v s. Frequency Figure 4. Inser tion Loss vs. Fre quency

Rev. 0

Information furnished by Analog Devices is believed to be accurate and reliable.
However, no responsibility is assumed by Analog Devices for its use, nor for any
infringements of patents or other rights of third parties that may result from its use.
Specifications subject to change without notice. No license is granted by implication
or otherwise under any patent or patent rights of Analog Devices. Trademarks and
registered trademarks are the property of their respective owners.

. A Lo gic 1 on the EN pin disables

EN

S21

S12

FREQUENCY (Hz)

10G10k 100k 1M 10M 100M 1G

04504-0-028

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

ADG904/ADG904-R

FUNCTIONAL BLOCK DIAGRAMS

RFC

ADG904-R

04504-0-001

RF1

RF2

RF3

RF4

1 OF 4 DECODER

A0 A1 EN

RFC

04504-0-012

10G10k 100k 1M 10M 100M 1G

04504-0-029

ADG904

RF1

50Ω

RF2

50Ω

RF3

50Ω

RF4

50Ω

1 OF 4 DECODER

A0 A1 EN

Figure 1 Figure 2

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

–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

INSERTION LOSS (dB)

–2.3
–2.4
–2.5
–2.6
–2.7

VDD = 2.5V

–2.8
–2.9

T

= 25°C

A

–3.0

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: [phone]
Fax: [phone] © 2004 Analog Devices, Inc. All rights reserved.

www.analog.com

FREQUENCY (Hz)

ADG904/ADG904-R

TABLE OF CONTENTS

Specifications..................................................................................... 3

Absolute Maximum Ratings............................................................ 4

Pin Configuration and Function Descriptions............................. 5

Terminology ...................................................................................... 6

Typical Performance Characteristics ............................................. 7

Test Circuits....................................................................................... 9

Applications..................................................................................... 11

REVISION HISTORY

Revision 0: Initial Version

Absorptive vs. Reflective............................................................ 11

Antenna Diversity Switch.......................................................... 11

Filter Selection ............................................................................ 11

Tx/Rx Switching ......................................................................... 11

Evaluation Board............................................................................ 12

Outline Dimensions....................................................................... 13

Ordering Guide .......................................................................... 13

Rev. 0 | Page 2 of 16

ADG904/ADG904-R

SPECIFICATIONS

Table 1. VDD = 1.65 V to 2.75 V, GND = 0 V, Input Power = 0 dBm, all specifications T

B Version
Parameter Symbol Conditions Min Typ2 Max Unit

AC ELECTRICAL CHARACTERISTICS

Operating Frequency3 DC 2 GHz
3 dB Frequency4 2.5 GHz
Input Power4 0 V dc bias 7 dBm

0.5 V dc bias 16 dBm
Insertion Loss S21, S12 DC to 100 MHz; VDD = 2.5 V ± 10% 0.4 0.8 dB

500 MHz; VDD = 2.5 V ± 10% 0.6 0.9 dB
1000 MHz; VDD = 2.5 V ± 10% 1.1 1.5 dB

Isolation—RFC to RF1–RF4 S21, S12 100 MHz 69 70 dB

500 MHz 60 65 dB
1000 MHz 30 37 dB

Crosstalk S21, S12 100 MHz 64 70 dB

500 MHz 60 65 dB
1000 MHz 30 35 dB

Return Loss (On Channel)4 S

, S22 DC to 100 MHz 21 27 dB

11

500 MHz 18 26 dB
1000 MHz 15 30 dB

Return Loss (Off Channel)4 S

, S22 DC to 100 MHz 18 22 dB

11

500 MHz 16 23 dB
1000 MHz 18 22 dB

On Switching Time4 t

Off Switching Time4 t

Transition Time t
Rise Time4 t
Fall Time4 t
1 dB Compression4 P

ON (EN)

OFF ((EN)

50% Ax to 10% RF 12 15 ns

TRANS

10% to 90% RF 3 5 ns

RISE

90% to 10% RF 7.5 9 ns

FALL

1000 MHz 16 dBm

–1 dB

EN to 90% RF

50%

EN to 10% RF

50%

Third Order Intermodulation Intercept IP3 900 MHz/901 MHz, 4 dBm 28 31 dBm
Video Feedthrough5 3 mV p-p

DC ELECTRICAL CHARACTERISTICS

Input High Voltage V

V

Input Low Voltage V

V

V

INH

V

INH

V

INL

V

INL

DD

DD

DD

DD

= 2.25 V to 2.75 V 1.7 V
= 1.65 V to 1.95 V 0.65 VCC V
= 2.25 V to 2.75 V 0.7 V
= 1.65 V to 1.95 V 0.35 VCC V

Input Leakage Current II 0 ≤ VIN ≤ 2.75 V ± 0.1 ± 1 µA

CAPACITANCE4

RF Port On Capacitance CRF ON f = 1 MHz 3 pF
Digital Input Capacitance C f = 1 MHz 2 pF

POWER REQUIREMENTS

VDD 1.65 2.75 V
Quiescent Power Supply Current IDD Digital inputs = 0 V or VDD 0.1 1 µA

1

Temperature range B Version: −40°C to +85°C.

2

Typical values are at VDD = 2.5 V and 25°C, unless otherwise stated.

3

Operating frequency is the point at which insertion loss degrades by 1.5 dB.

4

Guaranteed by design, not subject to production test.

5

Video feedthrough is the dc transience at the output of any port of the switch when the control voltage is switched from high to low or low to high in a 50 Ω test

setup, measured with 1 ns rise time pulses and 500 MHz bandwidth.

MIN

to T

, unless otherwise noted1

MAX

8.5 10 ns

13 16 ns

Rev. 0 | Page 3 of 16

ADG904/ADG904-R

ABSOLUTE MAXIMUM RATINGS

Table 2. TA = 25°C, unless otherwise noted

Parameter Rating

VDD to GND –0.5 V to +4 V
Inputs to GND –0.5 V to VDD + 0.3 V1
Continuous Current 30 mA
Input Power 18 dBm
Operating Temperature Range

Industrial (B Version) –40°C to +85°C
Storage Temperature Range –65°C to +150°C
Junction Temperature 150°C
TSSOP Package

θJA Thermal Impedance 143°C/W
Lead Temperature, Soldering (10 sec) 300°C
IR Reflow, Peak Temperature (<20 sec) 235°C
ESD 1 kV

Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only and functional operation of the device at these or
any other conditions above those listed in the operational
sections of this specification is not implied. Exposure to
absolute maximum rating conditions for extended periods may
affect device reliability. Only one absolute maximum rating may
be applied at any one time.

Table 3. Truth Table

A1 A0

X X 1 None
0 0 0 RF1
0 1 0 RF2
1 0 0 RF3
1 1 0 RF4

1

RFx Off Port Inputs to Ground = –0.5 V to VDD – 0.5 V.

2

OFF Switches have:

50 Ω termination to GND (ADG904).
Shunt to GND (ADG904-R).

EN

ON Switch2

ESD CAUTION

ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on
the human body and test equipment and can discharge without detection. Although this product features
proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy
electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance
degradation or loss of functionality.

Rev. 0 | Page 4 of 16

ADG904/ADG904-R

G

GNDG

G

G

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS

1

EN

V

2

DD

ND

3

ADG904

4

RF1

ADG904-R

5

TOP VIEW

(Not to Scale)

6

ND

7

RF3

8

ND

9

ND

10

RFC

Figure 5. 20-Lead TSSOP (RU-20)

Table 4. Pin Function Descriptions

Pin No. Mnemonic Function
1

Active Low Digital Input. When high, the device is disabled and all switches are off. When low, Ax

EN

logic inputs determine on switches.

2 VDD

Power Supply Input. These parts can be operated from 1.65 V to 2.75 V. V
to GND.

3, 5, 6, 8, 9, 11, 12, 13,

GND Ground Reference Point for All Circuitry on the Part.

15, 16, 18
4 RF1 RF1 Port.
7 RF3 RF3 Port.
10 RFC Common RF Port for Switch.
14 RF4 RF4 Port.
17 RF2 RF2 Port.
19 A1 Logic Control Input.
20 A0 Logic Control Input.

A0

20

A1

19

GND

18

RF2

17

GND

16

GND

15

RF4

14
13

GND

12

GND

11

GND

04504-0-002

should be decoupled

DD

Rev. 0 | Page 5 of 16