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50 MHz to 6 GHz RF/IF Gain Block ADL5541
FEATURES
Fixed gain of 15 dB Operation up to 6 GHz Input/output internally matched to 50 Integrated bias control circuit Output IP3 44 dBm at 500 MHz 40 dBm at 900 MHz Output 1 dB compression: 19.7 dBm at 900 MHz Noise figure of 3.5 dB at 900 MHz Single 5 V power supply Small footprint 8-lead LFCSP Pin compatible with 20 dB gain ADL5542 1 kV ESD (Class 1C)
FUNCTIONAL BLOCK DIAGRAM
INPUT MATCH OUTPUT MATCH
RFIN 1 GND 2 GND 3
8
RFOUT GND GND VPOS
06877-001
BIAS CONTROL
7
6
ADL5541
CB 4
5
Figure 1.
GENERAL DESCRIPTION
The ADL5541 is a broadband 15 dB linear amplifier that operates at frequencies up to 6 GHz. The device can be used in a wide variety of CATV, cellular, and instrumentation equipment. The ADL5541 provides a gain of 15 dB, which is stable over frequency, temperature, power supply, and from device to device. The device is internally matched to 50 with an input return loss of 10 dB or better up to 6 GHz. Only input/output ac coupling capacitors, power supply decoupling capacitors, and an external inductor are required for operation. The ADL5541 is fabricated on an InGaP HBT process and has an ESD rating of 1 kV (Class 1C). The device is packaged in a 3 mm x 3 mm LFCSP that uses an exposed paddle for excellent thermal impedance. The ADL5541 consumes 90 mA on a single 5 V supply and is fully specified for operation from -40C to +85C. A fully populated RoHS-compliant evaluation board is available. The ADL5542 is a companion part that offers a gain of 20 dB in a pin-compatible package.
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.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.461.3113 (c)2007 Analog Devices, Inc. All rights reserved.
ADL5541 TABLE OF CONTENTS
Features .............................................................................................. 1 Functional Block Diagram .............................................................. 1 General Description ......................................................................... 1 Revision History ............................................................................... 2 Specifications..................................................................................... 3 Typical Scattering Parameters..................................................... 5 Absolute Maximum Ratings............................................................ 6 ESD Caution.................................................................................. 6 Pin Configuration and Function Descriptions............................. 7 Typical Performance Characteristics ..............................................8 Basic Connections .......................................................................... 10 Soldering Information and Recommended PCB Land Pattern ....................................................................................................... 10 Evaluation Board ............................................................................ 11 Outline Dimensions ....................................................................... 12 Ordering Guide .......................................................................... 12
REVISION HISTORY
7/07--Revision 0: Initial Version
Rev. 0 | Page 2 of 12
ADL5541 SPECIFICATIONS
VPOS = 5 V and TA = 25C, unless otherwise noted. Table 1.
Parameter OVERALL FUNCTION Frequency Range Gain (S21) Input Return Loss (S11) Output Return Loss (S22) Reverse Isolation (S12) FREQUENCY = 100 MHz Gain Output 1 dB Compression Point Output Third-Order Intercept Noise Figure FREQUENCY = 500 MHz Gain vs. Frequency vs. Temperature vs. Supply Output 1 dB Compression Point Output Third-Order Intercept Noise Figure FREQUENCY = 900 MHz Gain vs. Frequency vs. Temperature vs. Supply Output 1 dB Compression Point Output Third-Order Intercept Noise Figure FREQUENCY = 2000 MHz Gain vs. Frequency vs. Temperature vs. Supply Output 1 dB Compression Point Output Third-Order Intercept Noise Figure FREQUENCY = 2400 MHz Gain vs. Frequency vs. Temperature vs. Supply Output 1 dB Compression Point Output Third-Order Intercept Noise Figure Conditions Min 50 900 MHz Frequency 500 MHz to 5 GHz Frequency 500 MHz to 5 GHz 15.2 -12 -10 -19 15.7 19 38 3.5 14.7 50 MHz -40C TA +85C 4.75 V to 5.25 V f = 1 MHz, output power (POUT) = 3 dBm per tone 15.1 0.15 0.1 0.01 19.9 44 3.5 15.2 0.03 0.15 0.01 19.7 40.8 3.5 14.7 0.03 0.17 0.01 16.3 39.2 3.8 14.5 0.03 0.19 0.02 14.9 38.6 4.0 15.5 Typ Max 6000 Unit MHz dB dB dB dB dB dBm dBm dB dB dB dB dB dBm dBm dB dB dB dB dB dBm dBm dB dB dB dB dB dBm dBm dB dB dB dB dB dBm dBm dB
f = 1 MHz, output power (POUT) = 0 dBm per tone
3.7 15.4
14.9 50 MHz -40C TA +85C 4.75 V to 5.25 V f = 1 MHz, output power (POUT) = 0 dBm per tone
3.7 15.4
13.9 50 MHz -40C TA +85C 4.75 V to 5.25 V f = 1 MHz, output power (POUT) = 0 dBm per tone
4.0 15.1
13.9 50 MHz -40C TA +85C 4.75 V to 5.25 V f = 1 MHz, output power (POUT) = 0 dBm per tone
4.2
Rev. 0 | Page 3 of 12
ADL5541
Parameter FREQUENCY = 3500 MHz Gain vs. Frequency vs. Temperature vs. Supply Output 1 dB Compression Point Output Third-Order Intercept Noise Figure FREQUENCY = 5800 MHz Gain vs. Frequency vs. Temperature vs. Supply Output 1 dB Compression Point Output Third-Order Intercept Noise Figure POWER INTERFACE Supply Voltage (VPOS) Supply Current vs. Temperature Power Dissipation Conditions Min 13.6 50 MHz -40C TA +85C 4.75 V to 5.25 V f = 1 MHz, output power (POUT) = 0 dBm per tone Typ 14.3 0.03 0.19 0.02 12.1 30.7 4.2 11.2 0.15 0.9 0.02 5.8 21.9 6.0 5 90 12 0.5 Max 14.9 Unit dB dB dB dB dBm dBm dB dB dB dB dB dBm dBm dB V mA mA W
4.5 13.5
9.1 50 MHz -40C TA +85C 4.75 V to 5.25 V f = 1 MHz, output power (POUT) = 0 dBm per tone Pin VPOS 4.5 -40C TA +85C VPOS = 5 V
7.0 5.5 100
Rev. 0 | Page 4 of 12
ADL5541
TYPICAL SCATTERING PARAMETERS
VPOS = 5 V and TA = 25C, the effects of the test fixture have been de-embedded up to the pins of the device. Table 2.
S11 Freq. (MHz) 50 100 500 900 1000 1500 2000 2500 3000 3500 4000 4500 5000 5500 6000 Magnitude (dB) -18.11 -20.84 -27.69 -27.48 -26.87 -29.18 -17.88 -9.87 -7.92 -7.74 -10.85 -13.25 -13.97 -13.68 -4.52 Angle () -134.53 -161.29 +115.36 +101.79 +91.91 -107.74 -153.68 +169.30 +142.75 +117.57 +116.84 +136.93 +143.02 -121.08 -138.62 16.29 15.93 15.58 15.52 15.56 15.50 15.51 15.57 15.49 15.21 14.82 15.23 14.56 13.89 12.07 S21 Magnitude (dB) Angle () +166.36 +168.53 +154.53 +136.22 +131.64 +108.03 +84.72 +59.74 +35.05 +9.15 -16.13 -41.75 -68.15 -96.10 -123.56 -19.15 -18.82 -18.70 -18.70 -18.64 -18.64 -18.43 -18.32 -17.93 -18.14 -18.11 -17.54 -17.64 -17.47 -18.61 S12 Magnitude (dB) Angle () +3.84 +2.26 -13.59 -26.33 -29.43 -44.69 -60.42 -75.48 -92.29 -110.62 -125.08 -142.99 -161.24 +178.77 +157.35 -17.89 -22.24 -24.96 -22.38 -23.15 -19.35 -14.13 -9.89 -8.69 -11.02 -15.70 -7.83 -6.87 -11.66 -7.66 S22 Magnitude (dB) Angle () -134.08 -155.22 +176.64 +173.92 +174.28 +167.80 +176.19 +161.55 +138.18 +100.39 +6.37 -80.59 -112.39 -102.32 -54.40
Rev. 0 | Page 5 of 12
ADL5541 ABSOLUTE MAXIMUM RATINGS
Table 3.
Parameter Supply Voltage, VPOS Input Power (re: 50 ) Internal Power Dissipation (Paddle Soldered) JC (Junction to Paddle) Maximum Junction Temperature Operating Temperature Range Storage Temperature Range Rating 6.5 V 10 dBm 650 mW 28.5C/W 150C -40C to +85C -65C to +150C
ESD CAUTION
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. 0 | Page 6 of 12
ADL5541 PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
RFIN 1 GND 2 GND 3 CB 4
PIN 1 INDICATOR
8 RFOUT 7 GND 6 GND 5 VPOS
06877-002
ADL5541
TOP VIEW (Not to Scale)
Figure 2. Pin Configuration
Table 4. Pin Function Descriptions
Pin No. 1 2, 3, 6, 7 4 5 8 Exposed Paddle Mnemonic RFIN GND CB VPOS RFOUT Description RF Input. Requires a dc blocking capacitor. Ground. Connect these pins to a low impedance ground plane. Low Frequency Bypass. A 1 F capacitor should be connected between this pin and ground. Power Supply for Bias Controller. Connect directly to external power supply. RF Output and Supply Voltage. DC bias is provided to this pin through an inductor that is tied to the external power supply. RF path requires a dc blocking capacitor. Exposed Paddle. Internally connected to GND. Solder to a low impedance ground plane.
Rev. 0 | Page 7 of 12
ADL5541 TYPICAL PERFORMANCE CHARACTERISTICS
45 40 45 OIP3 (+25C) 40 OIP3 (0dBm) 35 30 25 20 15 GAIN 10
06877-003
GAIN, P1dB, OIP3, NF (dB, dBm)
35
OIP3 AND P1dB (dBm)
30 OIP3 (-40C) 25 20 15 10 P1dB (-40C) P1dB (+85C)
OIP3 (+85C)
P1dB
5
5
0 0.5 0.9 1.3 1.7 2.1 2.5 2.9 3.3 3.7 4.1 4.5 4.9 5.3 5.7 FREQUENCY (GHz)
0 0.5 0.9 1.3 1.7 2.1 2.5 2.9 3.3 3.7 4.1 4.5 4.9 5.3 5.7 FREQUENCY (GHz)
Figure 3. Gain, P1dB, OIP3, and Noise Figure vs. Frequency
16
Figure 6. OIP3 and P1dB vs. Frequency and Temperature
50 500MHz 45
15
900MHz 40
+85C
14
-40C
2.4GHz
OIP3 (dBm)
35 30 3.5GHz 25 20
2GHz
GAIN (dB)
13
12 +25C 11
06877-004 06877-007
15 10 -5
10 0.5 0.9 1.3 1.7 2.1 2.5 2.9 3.3 3.7 4.1 4.5 4.9 5.3 5.7 FREQUENCY (GHz)
-3
-1
1
3
5
7
9
11
13
15
POUT (dBm)
Figure 4. Gain vs. Frequency and Temperature
0 -5 -10 S22 S11
Figure 7. OIP3 vs. Output Power (POUT) and Frequency
8
7
S11, S22, S12 (dB)
-15 -20 S12 -25 -30 -35
NOISE FIGURE (dB)
6 +85C 5 +25C 4 -40C 3
06877-008
-40 -45 0 1 2 3 FREQUENCY (GHz) 4 5 6
06877-005
2 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 FREQUENCY (GHz)
6.0
Figure 5. Input Return Loss (S11), Output Return Loss (S22), and Reverse Isolation (S12) vs. Frequency
Figure 8. Noise Figure vs. Frequency and Temperature
Rev. 0 | Page 8 of 12
06877-006
NF
P1dB (+25C)
ADL5541
30 25
25
20
PERCENTAGE (%)
PERCENTAGE (%)
06877-009
20
15
15
10
10
5
5
06877-011
0 37.0 38.5 40.0 OIP3 (dBm) 41.5 43.0
0 15.08
15.11
15.14
15.17 GAIN (dB)
15.20
15.23
15.26
Figure 9. OIP3 Distribution at 900 MHz
25 30
Figure 11. Gain Distribution at 900 MHz
20
25
PERCENTAGE (%)
15
PERCENTAGE (%)
06877-010
20
15
10
10
5
5
06877-012
0 19.4 19.5 19.6 19.7 19.8 19.9 20.0 20.1 P1dB (dBm)
0 3.30
3.36
3.42
3.48
3.54
3.60
3.66
3.72
3.78
NOISE FIGURE (dB)
Figure 10. P1dB Distribution at 900 MHz
Figure 12. Noise Figure Distribution at 900 MHz
Rev. 0 | Page 9 of 12
ADL5541 BASIC CONNECTIONS
The basic connections for operating the ADL5541 are shown in Figure 13. Recommended components are listed in Table 5. The input and output should be ac-coupled with appropriately sized capacitors (device characterization was performed with 33 pF capacitors). A 5 V dc bias is supplied to the amplifier via GND (Pin 6) and through a biasing inductor connected to RFOUT (Pin 8). The bias voltage should be decoupled using a 1 F capacitor, a 1.2 nF capacitor, and two 68 pF capacitors.
VCC C6 1F C5 1.2nF C4 68pF L1 47nH C1 33pF RFIN 2.5
06877-015
4.5
4.0
NOISE FIGURE (dB)
3.5
3.0
ADL5541
1 RFIN RFOUT 8 2 GND 3 GND 4 CB GND 7 GND 6 VPOS 5
C2 33pF RFOUT GND
2.0 50
100
150
200
250
300
350
400
450
500
FREQUENCY (MHz)
Figure 15. Noise Figure vs. Frequency from 50 MHz to 500 MHz
06877-013
C3 1F
VCC C7 68pF
SOLDERING INFORMATION AND RECOMMENDED PCB LAND PATTERN
Figure 16 shows the recommended land pattern for the ADL5541. To minimize thermal impedance, the exposed paddle on the package underside should be soldered down to a ground plane along with Pin 2, Pin 3, Pin 6, and Pin 7. If multiple ground layers exist, they should be stitched together using vias (a minimum of five vias is recommended). For more information on land pattern design and layout, refer to Application Note AN-772, A Design and Manufacturing Guide for the Lead Frame Chip Scale Package (LFCSP).
2.03mm
Figure 13. Basic Connections
For operation between 50 MHz and 500 MHz, a larger biasing choke and ac coupling capacitors are necessary (see Table 5). Figure 14 shows a plot of the input return loss, the output return loss and the gain with these components. At 100 MHz, the ADL5541 achieves an OIP3 of 38 dBm (POUT = 0 dBm per tone). The noise figure performance for operation from 50 MHz to 500 MHz is shown in Figure 15. When operating below 50 MHz, the ADL5541 exhibits gain peaking, and the input and output match degrade significantly.
17.0 16.5 16.0 S21 15.5 -10 -5
PIN 1
PIN 8
0.5mm
RETURN LOSS (dB)
1.85mm
1.78mm
GAIN (dB)
15.0 14.5 14.0 13.5 13.0 S11 12.5 100 150 200 250 300 350 400 450 S22
-15
PIN 4 1.53mm 0.71mm
PIN 5
06877-016
-20
-25
Figure 16. Recommended Land Pattern
FREQUENCY (MHz)
Figure 14. Input Return Loss (S11), Output Return Loss (S22), and Gain (S21) vs. Frequency
Table 5. Recommended Components for Basic Connections
Frequency 50 MHz to 500 MHz 500 MHz to 6000 MHz C1 0.1 F 33 pF C2 0.1 F 33 pF C3 1 F 1 F L1 470 nH (Coilcraft 0603LS-471-NX or equivalent) 47 nH (Coilcraft 0603CS-47-NX or equivalent) C4 68 pF 68 pF C5 1.2 nF 1.2 nF C6 1 F 1 F C7 68 pF 68 pF
Rev. 0 | Page 10 of 12
06877-014
12.0 50
-30 500
ADL5541 EVALUATION BOARD
Figure 19 shows the schematic for the ADL5541 evaluation board. The board is powered by a single 5 V supply. The components used on the board are listed in Table 6. Power can be applied to the board through clip-on leads (VCC and GND) or through a 2-pin header (W1).
Figure 18. Evaluation Board Layout (Top)
Figure 17. Evaluation Board Layout (Bottom)
06877-017
W1
VCC C6 1F C5 1.2nF C4 68pF L1 47nH C1 33pF RFIN
ADL5541
1 RFIN RFOUT 8 2 GND 3 GND 4 CB GND 7 GND 6 VPOS 5 DUT1 C7 68pF
C2 33pF RFOUT GND
VCC
Figure 19. Evaluation Board Schematic
Table 6. Evaluation Board Configuration
Component DUT1 C1, C2 C3 C4, C5, C6, C7, C8, C9 Function Gain block AC coupling capacitors Low frequency bypass capacitor Power supply decoupling capacitors Default Value ADL5541 33 pF, 0402 1 F, 0805 C4 and C7 = 68 pF, 0603 C5 = 1.2 nF, 0603 C6 = 1 F, 0805 C8 and C9 = open 47 nH, 0603 (Coilcraft 0603CS-47-NX or equivalent)
L1 VCC and GND W1
DC bias inductor Clip-on terminals for power supply 2-pin header for connection of ground and supply via cable
Rev. 0 | Page 11 of 12
06877-019
C3 1F
C8 OPEN
C9 OPEN
06877-018
ADL5541 OUTLINE DIMENSIONS
3.25 3.00 SQ 2.75 0.60 MAX 0.60 MAX
5 8
0.50 BSC
PIN 1 INDICATOR
TOP VIEW
2.95 2.75 SQ 2.55
EXPOSED PAD
(BOT TOM VIEW)
1.60 1.45 1.30 PIN 1 INDICATOR
4
1
12 MAX 0.90 MAX 0.85 NOM SEATING PLANE
0.70 MAX 0.65 TYP
0.50 0.40 0.30 0.05 MAX 0.01 NOM
1.89 1.74 1.59
Figure 20. 8-Lead Lead Frame Chip Scale Package [LFCSP_VD] 3 mm x 3 mm Body, Very Thin, Dual Lead (CP-8-2) Dimensions shown in millimeters
ORDERING GUIDE
Model ADL5541ACPZ-R7 1 ADL5541-EVALZ1
1
Temperature Range -40C to +85C
Package Description 8-Lead LFCSP_VD, Tape and Reel Evaluation Board
Package Option CP-8-2
061507-B
0.30 0.23 0.18
0.20 REF
Branding Q13
Z = RoHS Compliant Part.
Visit www.analog.com/rfamps for the latest information on the Analog Devices, Inc., entire RF amplifier portfolio. Visit www.analog.com/rf for the latest information on the Analog Devices entire RF portfolio.
(c)2007 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D06877-0-7/07(0)
Rev. 0 | Page 12 of 12

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