Analog Devices ADG918 9 a Datasheet

Wideband 4 GHz, 43 dB Isolation at 1 GHz, CMOS 1.65 V to 2.75 V, 2:1 Mux/SPDT Switches

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

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, while 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

0

VDD = 2.5V

–10

= 25°C

T

A

0

2

–

–30

–40

–50

–60

ISOLATION (dB)

–70

–80

–90

–100

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

S12

S21

FREQUENCY (Hz)

Figure 2. Off Is olation vs. Fre quency

03335-A-003

ADG918/ADG919

FUNCTIONAL BLOCK DIAGRAMS

RFC

CTRL

RFC

CTRL

LVTTL compatible. The low power consumption of these CMOS devices makes them ideally suited to wireless applications and general-purpose high frequency switching.

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

.

8

0

–

–1.0 –1.2 –1.4 –1.6 –1.8 –2.0 –2.2 –2.4

INSERTION LOSS (dB)

–2.6 –2.8

VDD = 2.5V

T

= 25°C

A

–3.0 –3.2

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

Figure 3. Insertion Loss vs. Frequency

ADG918

50Ω

ADG919

Figure 1.

FREQUENCY (Hz)

50Ω

RF1

RF2

RF1

RF2

03335-A-001

03335-A-004

Rev. A

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.

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ADG918/ADG919

TABLE OF CONTENTS

ADG918/ADG919–Specifications ................................................. 3

Absorptive vs. Reflective ........................................................... 12

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

ESD Caution.................................................................................. 4

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

Te r mi n ol o g y ...................................................................................... 6

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

Test C ir c ui t s .....................................................................................10

Applications..................................................................................... 12

REVISION HISTORY

9/04—Changed from Rev. 0 to Rev. A

Updated Format..................................................................Universal

Change to Data Sheet Title …………………………………….1

Change to Features…………..…………………………………...1

Change to Product Highlights…………………………………...1

Changes to Specifications.……..………………………………...3

Wireless Metering....................................................................... 12

Tune r Mo d u le s ............................................................................ 12

Filter Selection ............................................................................ 12

ADG9xx Evaluation Board ........................................................... 13

Outline Dimensions ....................................................................... 14

Ordering Guide .......................................................................... 14

Change to ADG9xx Evaluation Board section...……………….13

Changes to Ordering Guide…………………………………….14

8/03 Revision 0: Initial Version

Rev. A | Page 2 of 16

ADG918/ADG919

SPECIFICATIONS

Table 1. V

= 1.65 V to 2.75 V, GND = 0 V, input power = 0 dBm, all specifications T

DD

MIN

to T

, unless otherwise noted.

MAX

B Version Parameter Symbol Conditions Min Typ

2

Max Unit

AC ELECTRICAL CHARACTERISTICS Operating Frequency

3

DC 2 GHz 3 dB Frequency4 4 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 0.7 dB 500 MHz; VDD = 2.5 V ± 10% 0.5 0.8 dB 1000 MHz; VDD = 2.5 V ± 10% 0.8 1.25 dB Isolation—RFC to RF1/RF2 S21, S12 100 MHz 57 60 dB (CP Package) 500 MHz 46 49 dB 1000 MHz 36 43 dB Isolation—RFC to RF1/RF2 S21, S12 100 MHz 55 60 dB (RM Package) 500 MHz 43 47 dB 1000 MHz 34 37 dB Isolation—RF1 to RF2 (Crosstalk) S21, S

100 MHz 55 58

12

(CP Package) 500 MHz 41 44 1000 MHz 31 37 Isolation—RF1 to RF2 (Crosstalk) S21, S

100 MHz 54 57

12

(RM Package) 500 MHz 39 42 1000 MHz 31 33 Return Loss (On Channel)

4

S11, S22 DC to 100 MHz 21 27 dB 500 MHz 22 27 dB 1000 MHz 22 26 dB Return Loss (Off Channel)4 S11, S22 DC to 100 MHz 18 23 dB ADG918 500 MHz 17 21 dB 1000 MHz 16 20 dB On Switching Time4 tON 50% CTRL to 90% RF 6.6 10 ns Off Switching Time4 t Rise Time4 t Fall Time4 t 1 dB Compression4 P

50% CTRL to 10% RF 6.5 9.5 ns

OFF

10% to 90% RF 6.1 9 ns

RISE

90% to 10% RF 6.1 9 ns

FALL

1000 MHz 17 dBm

–1 dB

Third Order Intermodulation Intercept IP3 900 MHz/901 MHz, 4 dBm 30 36 dBm Video Feedthrough

5

2.5 mV p-p DC ELECTRICAL CHARACTERISTICS Input High Voltage V V Input Low Voltage V V Input Leakage Current II

VDD = 2.25 V to 2.75 V 1.7 V

INH

VDD = 1.65 V to 1.95 V 0.65 VCC V

INH

VDD = 2.25 V to 2.75 V 0.7 V

INL

VDD = 1.65 V to 1.95 V 0.35 VCCV

INL

0 ≤ V

≤ 2.75 V

IN

± 0.1 ± 1 µA CAPACITANCE4 RF1/RF2, RF Port On Capacitance CRF ON f = 1 MHz 1.6 pF CTRL Input Capacitance C

f = 1 MHz 2 pF

CTRL

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

Point at which insertion loss degrades by 1 dB.

4

Guaranteed by design, not subject to production test. 5The 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.

1

Rev. A | Page 3 of 16

ADG918/ADG919

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 V 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 MSOP Package

θJA Thermal Impedance

LFCSP Package

θJA Thermal Impedance (2-layer board)

θJA Thermal Impedance (4-layer board)

Lead Temperature, Soldering (10 sec) 300°C IR Reflow, Peak Temperature (<20 sec) 235°C ESD 1 kV

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.

1

206°C/W

84°C/W

48°C/W

NOTES

1

Stresses above those listed under Absolute Maximum Ratings may cause

2

permanent damage to the device. This is a stress rating only; 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.

2

RF1/RF2 Off Port Inputs to Ground .............................. –0.5 V to VDD – 0.5 V

Rev. A | Page 4 of 16

ADG918/ADG919

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS

V

CTRL

GND

RFC

DD

1

ADG918/

2

ADG919

3

TOP VIEW

(Not to Scale)

4

8

RF1

7

GND

6

GND

5

RF2

03335-A-002

Figure 4. 8-Lead MSOP (RM-8)

8-Lead 3 mm x 3 mm LFCSP (CP-8)

Table 3. Truth Table

CTRL Signal Path

0 RF2 to RFC 1 RF1 to RFC

Table 4. Pin Function Descriptions

Pin No. Mnemonic Function

1 VDD Power Supply Input. These parts can be operated from 1.65 V to 2.75 V, and VDD should be decoupled to GND. 2 CTRL CMOS or TTL Logic Level; 0->RF2 to RFC 1->RF1 to RFC 3, 6, 7 GND Ground Reference Point for All Circuitry on the Part 4 RFC COMMON RF Port for Switch 5 RF2 RF2 Port 8 RF1 RF1 Port

Rev. A | Page 5 of 16