Analog Devices AD8354 Service Manual

1 MHz to 2.7 GHz

FEATURES

Fixed gain of 20 dB Operational frequency of 1 MHz to 2.7 GHz Linear output power up to 4 dBm Input/output internally matched to 50 Ω Temperature and power supply stable Noise figure: 4.2 dB Power supply: 3 V or 5 V

APPLICATIONS

VCO buffers General Tx/Rx amplification Power amplifier predrivers Low power antenna drivers

GENERAL DESCRIPTION

The AD8354 is a broadband, fixed-gain, linear amplifier that operates at frequencies from 1 MHz up to 2.7 GHz. It is intended for use in a wide variety of wireless devices, including cellular, broadband, CATV, and LMDS/MMDS applications.

By taking advantage of ADI’s high performance, complementary Si bipolar process, these gain blocks provide excellent stability over process, temperature, and power supply. This amplifier is single-ended and internally matched to 50 Ω with a return loss of greater than 10 dB over the full operating frequency range.

RF Gain Block

AD8354

FUNCTIONAL BLOCK DIAGRAM

BIAS AND VREF

INPT

AD8354

Figure 1.

The noise figure is 4.2 dB at 900 MHz. The reverse isolation (S

) is −33 dB at 900 MHz.

12

The AD8354 can also operate with a 5 V power supply; in which case, no external inductor is required. Under these conditions, the AD8354 delivers 4.88 dBm with 20 dB of gain at 900 MHz. The dc supply current is 26 mA. At 900 MHz, the OIP3 is greater than 19 dBm; at 2.7 GHz, the OIP3 is 15 dBm. The noise figure is 4.4 dB at 900 MHz. The reverse isolation (S

) is −33 dB.

12

VPOS

VOUT

COM2COM1

02722-001

The AD8354 provides linear output power of nearly 4.3 dBm with 20 dB of gain at 900 MHz when biased at 3 V and an external RF choke is connected between the power supply and the output pin. The dc supply current is 24 mA. At 900 MHz, the output third-order intercept (OIP3) is greater than 18 dBm; at 2.7 GHz, the OIP3 is 14 dBm.

Rev. C

Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Anal og Devices for its use, nor for any infringements of patents or ot her 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.

The AD8354 is fabricated on ADI’s proprietary, high performance, 25 GHz, Si complementary, bipolar IC process. The AD8354 is available in a chip scale package that uses an exposed paddle for excellent thermal impedance and low impedance electrical connection to ground. It operates over a −40°C to +85°C temperature range, and an evaluation board is also available.

AD8354

REVISION HISTORY

12/05—Rev. B to Rev. C

Changes to Table 1............................................................................ 3

Changes to Table 2............................................................................ 4

Moved Figure 39 to Page 15; Renumbered Sequentially........... 15

Changes to Ordering Guide.......................................................... 16

Theory of Operation ...................................................................... 13

Basic Connections...................................................................... 13

Applications..................................................................................... 14

Low Frequency Applications Below 100 MHz........................... 14

Evaluation Board ............................................................................ 15

Outline Dimensions ....................................................................... 16

Ordering Guide .......................................................................... 16

8/05—Rev. A to Rev. B

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

Changes to Product Title, Features, and General Description... 1

Changes to Basic Connections Section........................................ 13

Added Low Frequency Applications Below 100 MHz Section. 14

Changes to Ordering Guide.......................................................... 16

Updated Outline Dimensions....................................................... 16

6/02—Rev. 0 to Rev. A

Changes to Ordering Guide............................................................ 4

Replaced TPC 34............................................................................. 10

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

2/02—Revision 0: Initial Version

Rev. C | Page 2 of 16

AD8354

SPECIFICATIONS

VS = 3 V, TA = 25°C, 100 nH external inductor between VOUT and VPOS, ZO = 50 Ω, unless otherwise noted.

Table 1.

Parameter Conditions Min Typ Max Unit

OVERALL FUNCTION

Frequency Range 1 2700 MHz

Gain f = 900 MHz 19.5 dB f = 1.9 GHz 18.6 dB f = 2.7 GHz 17.1 dB Delta Gain f = 900 MHz, −40°C ≤ TA ≤ +85°C −0.97 dB f = 1.9 GHz, −40°C ≤ TA ≤ +85°C −1.05 dB f = 2.7 GHz, −40°C ≤ TA ≤ +85°C −1.33 dB Gain Supply Sensitivity VPOS ± 10%, f = 900 MHz 0.54 dB/V f = 1.9 GHz 0.37 dB/V f = 2.7 GHz 0.2 dB/V

Reverse Isolation (S12) f = 900 MHz −33.5 dB f = 1.9 GHz −38 dB f = 2.7 GHz −32.9 dB

RF INPUT INTERFACE Pin INPT

Input Return Loss f = 900 MHz 24.4 dB f = 1.9 GHz 23 dB f = 2.7 GHz 12.7 dB

RF OUTPUT INTERFACE Pin VOUT

Output Compression Point f = 900 MHz, 1 dB compression 4.6 dBm f = 1.9 GHz 3.7 dBm f = 2.7 GHz 2.7 dBm Delta Compression Point f = 900 MHz, −40°C ≤ TA ≤ +85°C 0.7 dB f = 1.9 GHz, −40°C ≤ TA ≤ +85°C 0.7 dB f = 2.7 GHz, −40°C ≤ TA ≤ +85°C 0.8 dB Output Return Loss f = 900 MHz 23.6 dB f = 1.9 GHz 16.5 dB f = 2.7 GHz 14.6 dB

DISTORTION/NOISE

Output Third-Order Intercept f = 900 MHz, ∆f = 1 MHz, PIN = −28 dBm 19 dBm f = 1.9 GHz, ∆f = 1 MHz, PIN = −28 dBm 16 dBm f = 2.7 GHz, ∆f = 1 MHz, PIN = −28 dBm 14.2 dBm Output Second-Order Intercept f = 900 MHz, ∆f = 1 MHz, PIN = −28 dBm 29.7 dBm Noise Figure f = 900 MHz 4.2 dB

f = 1.9 GHz 4.8 dB f = 2.7 GHz 5.4 dB POWER INTERFACE Pin VPOS

Supply Voltage 2.7 3 3.3 V Total Supply Current 16 23 31 mA Supply Voltage Sensitivity 6.2 mA/V Temperature Sensitivity −40°C ≤ TA ≤ +85°C 33 μA/°C

Rev. C | Page 3 of 16

AD8354

VS = 5 V, TA = 25°C, no external inductor between VOUT and VPOS, ZO = 50 Ω, unless otherwise noted.

Table 2.

Parameter Conditions Min Typ Max Unit

OVERALL FUNCTION

Frequency Range 1 2700 MHz

Gain f = 900 MHz 19.5 dB f = 1.9 GHz 18.7 dB f = 2.7 GHz 17.3 dB Delta Gain f = 900 MHz, −40°C ≤ TA ≤ +85°C −0.93 dB f = 1.9 GHz, −40°C ≤ TA ≤ +85°C −0.99 dB f = 2.7 GHz, −40°C ≤ TA ≤ +85°C −1.21 dB Gain Supply Sensitivity VPOS ± 10%, f = 900 MHz 0.32 dB/V f = 1.9 GHz 0.21 dB/V f = 2.7 GHz 0.08 dB/V Reverse Isolation (S12) f = 900 MHz −33.5 dB f = 1.9 GHz −37.6 dB f = 2.7 GHz −32.9 dB

RF INPUT INTERFACE Pin INPT

Input Return Loss f = 900 MHz 24.4 dB f = 1.9 GHz 23.9 dB f = 2.7 GHz 13.5 dB

RF OUTPUT INTERFACE Pin VOUT

Output Compression Point f = 900 MHz 4.8 dBm f = 1.9 GHz 4.6 dBm f = 2.7 GHz 3.6 dBm Delta Compression Point f = 900 MHz, −40°C ≤ TA ≤ +85°C 0.37 dB f = 1.9 GHz, −40°C ≤ TA ≤ +85°C −0.14 dB f = 2.7 GHz, −40°C ≤ TA ≤ +85°C −0.05 dB Output Return Loss f = 900 MHz 23.7 dB f = 1.9 GHz 22.5 dB f = 2.7 GHz 17.6 dB

DISTORTION/NOISE

Output Third-Order Intercept f = 900 MHz, ∆f = 50 MHz, PIN = −30 dBm 19.3 dBm f = 1.9 GHz, ∆f = 50 MHz, PIN = −30 dBm 17.3 dBm f = 2.7 GHz, ∆f = 50 MHz, PIN = −30 dBm 15.3 dBm Output Second-Order Intercept f = 900 MHz, ∆f = 1 MHz, PIN = −28 dBm 28.7 dBm Noise Figure f = 900 MHz 4.4 dB f = 1.9 GHz 5 dB f = 2.7 GHz 5.6 dB

POWER INTERFACE Pin VPOS

Supply Voltage 4.5 5 5.5 V Total Supply Current TA = 27°C 17 25 34 mA Supply Voltage Sensitivity 4 mA/V Temperature Sensitivity −40°C ≤ TA ≤ +85°C 28 μA/°C

Rev. C | Page 4 of 16

AD8354

ABSOLUTE MAXIMUM RATINGS

Table 3.

Parameter Rating

Supply Voltage, VPOS 5.5 V Input Power (re: 50 Ω) 10 dBm

Equivalent Voltage 700 mV rms

Internal Power Dissipation

Paddle Not Soldered 325 mW

Paddle Soldered 812 mW

θ

(Paddle Soldered) 80°C/W

JA

θ

(Paddle Not Soldered) 200°C/W

JA

Maximum Junction Temperature 150°C Operating Temperature Range −40°C to +85°C Storage Temperature Range −65°C to +150°C Lead Temperature (Soldering 60 sec) 240°C

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.

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

Rev. C | Page 5 of 16

Analog Devices AD8354 Service Manual

FEATURES

APPLICATIONS

GENERAL DESCRIPTION

FUNCTIONAL BLOCK DIAGRAM

TABLE OF CONTENTS

REVISION HISTORY

SPECIFICATIONS

ABSOLUTE MAXIMUM RATINGS

ESD CAUTION