21.2 GHz to 23.6 GHz, Low Noise Amplifier
Data Sheet ADL5726
Rev. A Document Feedback
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 ©2016 Analog Devices, Inc. All rights reserved.
Technical Support www.analog.com
FEATURES
Frequency range: 21.2 GHz to 23.6 GHz
Typical gain of >22.5 dB
Low noise input
Noise figure
3.3 dB typical at 21.2 GHz
3.4 dB typical at 23.6 GHz
High linearity input
≥1.0 dBm typical input third-order intercept (IIP3)
−8 dBm input 1 dB compression point (P1dB) at 23.6 GHz
Matched 50 Ω single-ended input
Matched 100 Ω differential outputs
8-lead, 2.00 mm × 2.00 mm LFCSP microwave packaging
APPLICATIONS
Point to point microwave radios
Instrumentation
Satellite communications (SATCOM)
Phased arrays
FUNCTIONAL BLOCK DIAGRAM
14320-001
50Ω
SINGLE-ENDED 100Ω
DIFFERENTIAL
GND
INPT
RBIAS
VCC1
OUTN
OUTP
DNC
VCC2
ADL5726
DNC = DO NOT CONNECT.
DO NOT CONNECT TO THIS PIN.
Figure 1.
GENERAL DESCRIPTION
The ADL5726 is a narrow-band, high performance, low noise
amplifier (LNA) targeting microwave radio link receiver
designs. The monolithic silicon germanium (SiGe) design is
optimized for microwave radio link bands ranging from 21.2 GHz
to 23.6 GHz. The unique design offers a single-ended 50 Ω input
impedance and provides a 100 Ω balanced differential output
that is ideal for driving Analog Devices, Inc., differential
downconverters and radio frequency (RF) sampling analog-to-
digital converters (ADCs). This LNA provides noise figure
performance that, in the past, required more expensive three-
five (III-V) compounds process technology to achieve.
The ADL5721 and ADL5723 to ADL5726 family of narrow-
band LNAs are each packaged in a tiny, thermally enhanced,
2.00 mm × 2.00 mm LFCSP package. The ADL5721 and
ADL5723 to ADL5726 family operates over the temperature
range of −40°C to +85°C.
ADL5726 Data Sheet
Rev. A | Page 2 of 13
TABLE OF CONTENTS
Features .....................................................................................1
Applications...............................................................................1
Functional Block Diagram.........................................................1
General Description ..................................................................1
Revision History ........................................................................2
Specifications .............................................................................3
AC Specifications ...................................................................3
DC Specifications...................................................................3
Absolute Maximum Ratings ......................................................4
Thermal Resistance ................................................................4
ESD Caution ..........................................................................4
Pin Configuration and Function Descriptions...........................5
Typical Performance Characteristics .........................................6
Theory of Operation ................................................................. 8
Applications Information .......................................................... 9
Layout.................................................................................... 9
Differential vs. Single-Ended Output..................................... 9
Performance Up To 26.5 GHz.............................................. 10
Evaluation Board ..................................................................... 11
Initial Setup ......................................................................... 11
Results ................................................................................. 11
Basic Connections for Operation......................................... 12
Outline Dimensions ................................................................ 13
Ordering Guide ................................................................... 13
REVISION HISTORY
9/2016—Rev. 0 to Rev. A
Changes to Figure 1 ...................................................................1
Added Performance Up To 26.5 GHz Section and Figure 18 to
Figure 23; Renumbered Sequentially .........................................9
Changes to Figure 26 ...............................................................12
4/2016—Revision 0: Initial Version
Data Sheet ADL5726
Rev. A | Page 3 of 13
SPECIFICATIONS
AC SPECIFICATIONS
VCC1 = 1.8 V, VCC2 = 3.3 V, RBIAS = 442 Ω, TA = 25°C, ZSOURC E = 50 Ω, ZLOAD = 100 Ω differential, unless otherwise noted.
Table 1.
Parameter
Test Conditions/Comments
Min
Typ
Max
Unit
FREQUENCY RANGE 21.2 23.6 GHz
FREQUENCY = 21.2 GHz
Gain (S21) 24.7 dB
Noise Figure 3.3 dB
Input Third-Order Intercept (IIP3) Δf = 1 MHz, input power (PIN) = −30 dBm per tone 1.0 dBm
Input 1 dB Compression Point (P1dB) −9.5 dBm
Input Return Loss (S11) 10 dB
Output Return Loss (S22) 10 dB
FREQUENCY = 23.6 GHz
Gain (S21) 22.5 dB
Noise Figure 3.4 dB
Input Third-Order Intercept (IIP3) Δf = 1 MHz, PIN = −30 dBm per tone 3.0 dBm
In
put 1 dB Compression Point (P1dB)
−8 dBm
Input Return Loss (S11)
10 dB
Output Return Loss (S22) 10 dB
DC SPECIFICATIONS
Table 2.
Parameter Test Conditions/Comments Min Typ Max Unit
POWER INTERFACE
Voltage
VCC1 1.65 1.8 1.95 V
VCC2 3.1 3.3 3.5 V
Quiescent Current vs. Temperature
VCC1 TA = 25°C 14.1 mA
−40°C ≤ TA ≤ +85°C 15.4 mA
VCC2 TA = 25°C 74.4 mA
−40°C ≤ TA ≤ +85°C 77.0 mA
ADL5726 Data Sheet
Rev. A | Page 4 of 13
ABSOLUTE MAXIMUM RATINGS
Table 3.
Parameter Rating
Supply Voltages
VCC1 2.25 V
VCC2 4.1 V
Maximum Junction Temperature 150°C/W
Operating Temperature Range −40°C to +85°C
Storage Temperature Range −55°C to +125°C
Lead Temperature Range (Soldering, 60 sec) −65°C to +150°C
Stresses at or above those listed under Absolute Maximum
Ratings may cause permanent damage to the product. This is a
stress rating only; functional operation of the product at these
or any other conditions above those indicated in the operational
section of this specification is not implied. Operation beyond
the maximum operating conditions for extended periods may
affect product reliability.
THERMAL RESISTANCE
θJA is thermal resistance, junction to ambient (°C/W), θJB is
thermal resistance, junction to board (°C/W), and θJC is thermal
resistance, junction to case (°C/W).
Table 4. Thermal Resistance
Package Type θJA1 θJB1 θJC1 Unit
8-Lead LFCSP 39.90 23.88 3.71 °C/W
1 See JEDEC standard JESD51-2 for additional information on optimizing the
thermal impedance for a printed circuit board (PCB) with 3 × 4 vias.
ESD CAUTION
Data Sheet ADL5726
Rev. A | Page 5 of 13
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
GND
INPT
RBIAS
VCC1
OUTN
OUTP
DNC
VCC2
3
4
1
2
6
5
8
7
ADL5726
TOP VIEW
(Not to Scale)
14320-002
N
OTES
1
. DNC = DO NOT CONNECT. DO NOT
CONNECT TO THIS PIN.
. THE EXPOSED PAD MUST BE
SOLDERED TO A LOW IMPEDANCE
GROUND PLANE.
3
. THE DEVICE NUMBER ON THE FIGURE
DOES NOT INDICATE THE LABEL ON
THE PACKAGE. REFER TO THE PIN 1
INDICATOR FOR THE PIN LOCATIONS.
Figure 2. Pin Configuration
Table 5. Pin Function Descriptions
Pin No. Mnemonic Description
1 VCC1 1.8 V Power Supply. It is recommended to place the decoupling capacitors as close to this pin as possible.
2 GND Ground.
3 INPT RF Input. This is a 50 Ω single-ended input.
4 RBIAS Resistor Bias. For typical operation, connect a 442 Ω resistor from RBIAS to GND. It is recommended to place
the RBIAS resistor as close to the pin as possible.
5 DNC Do Not Connect. Do not connect to this pin.
6, 7 OUTP, OUTN RF Outputs. These pins are 100 Ω differential outputs.
8 VCC2 3.3 V Power Supply. It is recommended to place the decoupling capacitors as close to this pin as possible.
EPAD (EP) Exposed Pad. The exposed pad must be soldered to a low impedance ground plane.
ADL5726 Data Sheet
Rev. A | Page 6 of 13
TYPICAL PERFORMANCE CHARACTERISTICS
35
0
5
10
15
20
25
30
21.2 21.5 21.8 22.1 22.4 22.7 23.0 23.3 23.6
GAI N (dB)
FREQUENCY ( GHz)
14320-003
TA = –40°C
TA = +25°C
TA = +85°C
Figure 3. Gain vs. Frequency for Various Temperatures
35
0
5
10
15
20
25
30
21.2 21.5 21.8 22.1 22.4 22.7 23.0 23.3 23.6
GAI N (dB)
FREQUENCY ( GHz)
14320-004
3.1V/1.65V
3.3V/1.8V
3.5V/1.95V
Figure 4. Gain vs. Frequency for Various Supply Voltages
10
0
2
4
6
1
3
5
7
8
9
21.2 21.5 21.8 22.1 22.4 22.7 23.0 23.3 23.6
NOISE FIGURE (dB)
FREQUENCY ( GHz)
14320-005
TA = –40°C
TA = +25°C
TA = +85°C
Figure 5. Nosie Figure vs. Frequency for Various Temperatures
10
0
2
4
6
1
3
5
7
8
9
21.2 21.5 21.8 22.1 22.4 22.7 23.0 23.3 23.6
NOISE FIGURE (dB)
FREQUENCY ( GHz)
14320-006
3.1V/1.65V
3.3V/1.8V
3.5V/1.95V
Figure 6. Noise Figure vs. Frequency for Various Supply Voltages
15
–25
–20
–15
–10
–5
0
5
10
21.2 21.5 21.8 22.1 22.4 22.7 23.0 23.3 23.6
INPUT P1dB (dBm)
FREQUENCY ( GHz)
14320-007
TA = –40°C
TA = +25°C
TA = +85°C
Figure 7. Input P1dB vs. Frequency for Various Temperatures
15
–25
–20
–15
–10
–5
0
5
10
21.2 21.5 21.8 22.1 22.4 22.7 23.0 23.3 23.6
INPUT P1dB (dBm)
FREQUENCY ( GHz)
14320-008
3.1V
3.3V
3.5V
Figure 8. Input P1dB vs. Frequency for Various Supply Voltages
Data Sheet ADL5726
Rev. A | Page 7 of 13
15
–25
–20
–15
–10
–5
0
5
10
21.2 21.5 21.8 22.1 22.4 22.7 23.0 23.3 23.6
INPUT I P 3 ( dBm)
FRE Q UE NCY ( GHz)
14320-009
T
A
= –40° C
T
A
= +25°C
T
A
= +85°C
Figure 9. Input IP3 vs. Frequency for Various Temperatures
15
–25
–20
–15
–10
–5
0
5
10
21.2 21.5 21.8 22.1 22.4 22.7 23.0 23.3 23.6
INPUT I P 3 ( dBm)
FRE Q UE NCY ( GHz)
14320-010
3.1V
3.3V
3.5V
Figure 10. Input IP3 vs. Frequency for Various Supply Voltages
0
–30
–25
–20
–15
–10
–5
21.2 21.5 21.8 22.1 22.4 22.7 23.0 23.3 23.6
INPUT RETURN L OSS ( dB)
FRE Q UE NCY ( GHz)
14320-011
T
A
= –40° C
T
A
= +25°C
T
A
= +85°C
Figure 11. Input Return Loss vs. Frequency for Various Temperatures
0
–30
–25
–20
–15
–10
–5
21.2 21.5 21.8 22.1 22.4 22.7 23.0 23.3 23.6
OUT P UT RETURN L OSS ( dB)
FRE Q UE NCY ( GHz)
14320-012
T
A
= –40° C
T
A
= +25°C
T
A
= +85°C
Figure 12. Output Return Loss vs. Frequency for Various Temperatures
ADL5726 Data Sheet
Rev. A | Page 8 of 13
THEORY OF OPERATION
The ADL5726 is a narrow-band, high performance, low noise
amplifier targeting microwave radio link receiver designs. The
monolithic SiGe design is optimized for microwave radio link
bands ranging from 21.2 GHz to 23.6 GHz.
The unique design of the ADL5726 offers a single-ended 50 Ω
input impedance via the INPT pin, and provides a 100 Ω
balanced differential output via the OUTP and OUTN pins.
This LNA is ideal for driving Analog Devices differential
downconverters and RF sampling ADCs.
The ADL5726 provides cost-effective noise figure performance
without requiring more expensive III-V compounds process
technology.
The ADL5726 is available in a 2.00 mm × 2.00 mm LFCSP package,
and operates over the temperature range of −40°C to +85°C.
Data Sheet ADL5726
Rev. A | Page 9 of 13
APPLICATIONS INFORMATION
LAYOUT
Solder the exposed pad on the underside of the ADL5726 to a
low thermal and electrical impedance ground plane. This pad is
typically soldered to an exposed opening in the solder mask on
the evaluation board. Connect the ground vias to all other
ground layers on the evaluation board to maximize heat
dissipation from the device package.
14320-016
Figure 13. Evaluation Board Layout for the ADL5726 Package
DIFFERENTIAL vs. SINGLE-ENDED OUTPUT
This section provides the test results that compare the ADL5726
using a differential vs. single-ended output. When using the
device as a single-ended output, use the RFOP output of the
evaluation board and terminate RFON to 50 Ω. Note that the
converse can be done as well; however, doing so produces
slightly different results from the plots shown in this section
because there is some amplitude imbalance between the two
differential ports, RFOP and RFON. The output trace and
connector loss were not deembedded for these measurements.
0
5
10
15
20
25
35
30
21.2 21.5 21.8 22.1 22.4 22.7 23.0 23.3 23.6
GAI N (dB)
FREQUENCY (GHz)
14320-017
Figure 14. Gain vs. Frequency
0
1
2
3
4
5
6
7
8
9
10
21.2 21.5 21.8 22.1 22.4 22.7 23.0 23.3 23.6
NOISE FIGURE (dB)
FREQUENCY (GHz)
14320-018
Figure 15. Noise Figure vs. Frequency
–10
–15
–20
–25
–5
0
5
10
15
21.2 21.5 21.8 22.1 22.4 22.7 23.0 23.3 23.6
INPUT I P 3 ( dBm)
FREQUENCY (GHz)
14320-021
Figure 16. Input IP3 vs. Frequency
–25
–20
–15
–10
–5
0
5
15
10
21.2 21.5 21.8 22.1 22.4 22.7 23.0 23.3 23.6
INPUT P1dB (dBm)
FREQUENCY (GHz)
14320-020
Figure 17. Input P1dB vs. Frequency
ADL5726 Data Sheet
Rev. A | Page 10 of 13
PERFORMANCE UP TO 26.5 GHz
This section provides the test results at a higher frequency from
23.2 GHz to 26.5 GHz. Differential outputs are measured here.
Traces, hybrids, and connector losses were deembeded for all
measurements except output return loss. It is important to note
that this performance is typical and not guaranteed.
FREQUENCY (GHz)
26.526.025.0 25.524.0 24.523.6
35
GAI N (dB)
30
25
20
15
10
5
0
14320-118
Figure 18. Gain vs. Frequency
15
10
5
0
–5
–10
–15
–20
–25
FREQUENCY (G Hz)
26.526.025.0 25.524.0 24.523.6
INPUT P1dB (dBm)
14320-119
Figure 19. Input P1dB vs. Frequency
15
10
5
0
–5
–10
–15
–20
–25
FREQUENCY (G Hz)
26.526.025.0 25.524.0 24.523.6
II P 3 ( dBm)
14320-120
Figure 20. IIP3 vs. Frequency
10
8
6
4
2
0
FREQUENCY (G Hz)
26.526.025.0 25.524.0 24.523.6
INPUT FIGURE (dB)
14320-121
Figure 21. Noise Figure vs. Frequency
0
–5
–10
–15
–20
–25
–30
FREQUENCY (GHz)
26.526.025.0 25.524.0 24.523.6
INPUT RETURN L OSS ( dB)
14320-122
Figure 22. Input Return Loss vs. Frequency
0
FREQUENCY (G Hz)
26.526.025.0 25.524.0 24.523.6
OUTPUT RE TURN L OSS ( dB)
–5
–10
–15
–20
–25
–30
14320-123
Figure 23. Output Return Loss vs. Frequency
Data Sheet ADL5726
Rev. A | Page 11 of 13
EVALUATION BOARD
The ADL5726-E VALZ comes with an ADL5726 chip. It supports
a single 5 V supply for ease of use. For 5 V operation, the 3.3 V
and 1.8 V test loops are for evaluation purposes only. When
using a 3.3 V or 1.8 V supply, remove the R1 and R2 resistors
from the evaluation board. Figure 25 shows the ADL5726-
E VALZ lab bench setup.
INITIAL SETUP
To set up the ADL5726-E VALZ , take the following steps:
1. Power up the ADL5726-E VALZ with a 5 V dc supply. The
supply current of the evaluation board is approximately
90 mA, which is a combination of the VCC1 (1.8 V) and
the VCC2 (3.3 V) currents.
2. Connect the signal generator to the input of the ADL5726-
E VALZ .
3. Connect RFOP and RFON to a 180° hybrid that works
within the 21.2 GHz to 23.6 GHz frequency range.
4. Connect the difference output of the hybrid to the
spectrum analyzer. The sum port of the hybrid must be
terminated to 50 Ω.
See Figure 25 for the ADL5726-E VALZ lab bench setup.
RESULTS
Figure 24 shows the expected results when testing the
ADL5726-E VALZ using the Rev. A version of the evaluation
board and its software. Note that future iterations of the software
may produce different results. See the ADL5726 product page
for the most recent software version.
Figure 24 shows the results of the differential output for an input
of 21.2 GHz at −15 dBm. The hybrid and board loss have not
been deembedded.
POWER OUT P UT (d Bm)
20
10
0
–10
–20
–30
–40
–50
–60
–70
–80
1
14320-013
21.15 21.1721.16 21.18 21.19 21.21 21.2321.20 21.22 21.24 21.25
FREQUENCY (G Hz)
RESO LUT IO N BANDW IDTH = 20 kHz
VIDE O BANDWIDTH = 20 kHz
SWEEP = 301ms ( 1001pt s)
Figure 24. Test Results at 21.2 GHz
+5V DC GND
INPUT
RF FREQ UE NCY G ENERATOR
RFON
RFOP
180° HYBRID F OR DIFF E RE NTIAL
TO SINGL E E NDE D OUTP UT
SPECTRUM
ANALYZER
14320-014
Figure 25. ADL5726-EVALZ Lab Bench Setup
ADL5726 Data Sheet
Rev. A | Page 12 of 13
BASIC CONNECTIONS FOR OPERATION
Figure 26 shows the basic connections for operating the ADL5726 as it is implemented on the evaluation board of the device.
DNI
U2U1
RFIN
RBIAS
R4
R2R1
P1
GND
C12
C11
C10C9
C8
C7
C6C5 C4
C3C2
C1
572X_RFOP
572X_RFON
5V 3P3V 1P8V
R3
ADL5726
DUTA
ADM7172ACPZ-3.3ADM7170ACPZ-1.8
25-146-1000-92
442
10K
00
69157-102HLF
BLK
4.7UF
1000PF
4.7UF4.7UF
1000PF
4.7UF
0.1UF0.1UF 4.7NF
33PF33PF
4.7NF
25-146-1000-92
25-146-1000-92
RED RED RED
0
5
2
37
6
PAD
4
1 8
111
CNSRI2516100092_SW109201A5
1
234
CNSRI2516100092_SW109201A5
1
234
1
1
2
CNSRI2516100092_SW109201A5
1
2 3 4
5
PAD 6
3
4
8
7
1
25
PAD 6
3
4
8
7
1
2
OUTP
OUTN
RFIN
1.8V
5V
1.8V
1.8V 3.3V
3.3V
3.3V5V
5V
1.8V
AGND
AGND
AGND AGND
OUTN
OUTPINPT
PAD
VCC2
DNCRBIAS
GND
VCC1
AGND
AGND
AGND
AGND
AGND
AGNDAGND
AGND
AGND
EP
VIN2
VIN1
GND
EN
SS
SENSE
VOUT2
VOUT1
EP
VIN
VIN
GND
EN
SS
SENSE
VOUT
VOUT
AGND
AGND
AGND
AGND
AGND
AGND AGND
AGND
AGND
14320-015
Figure 26. Evaluation Board Schematic
Table 6. Evaluation Board Configuration Options
Component Function Default Condition
3P3V, 1P8V, GND, 5V Power supplies and ground. Not applicable
RFIN, 572X_RFOP, 572x_RFON Input, output, and data. Not applicable
RBIAS 442
Ω for RBIAS
. RBIAS = 442
Ω (0402)
R1, R2
1.8 V and 3.3 V regulator connections.
R1, R2 = 0 Ω (0402)
R3 Do not install (DNI). R3 = DNI (0402)
R4 Pull-up or pull-down resistor. R4 = 10 kΩ (0402)
C1 to C12 The capacitors provide the required decoupling for the supply
related pins.
C1, C4 = 4.7 nF (0402)
C2, C3 = 33 pF (0402),
C5, C6 = 0.1 µF (0402),
C7, C9, C10, C12 = 4.7 µF (0603),
C8, C11 = 1000 pF (0603)
P1 Jumper to change bands, 2-pin jumper. Not applicable
U1 ADM7170ACPZ-1.8 1.8 V regulator. Not applicable
U2 ADM7172ACPZ-3.3 3.3 V regulator. Not applicable
DUTA ADL5726 device under test (DUT). Not applicable
Data Sheet ADL5726
Rev. A | Page 13 of 13
OUTLINE DIMENSIONS
1.70
1.60
1.50
0.425
0.350
0.275
TOP VIEW
8
1
5
4
0.30
0.25
0.20
BOTTOM VIEW
PIN 1 INDEX
AREA
SEATING
PLANE
0.60
0.55
0.50
1.10
1.00
0.90
0.20 REF
0.15 REF
0.05 M AX
0.02 NO M
0.50 BSC
EXPOSED
PAD
PIN 1
INDICATOR
(R 0. 15)
FOR PRO P E R CONNECT IO N OF
THE EXPOSED PAD, REFER TO
THE PIN CO NFI GURATIO N AND
FUNCTION DES CRIPT IO NS
SECTION OF THIS DATA SHEET.
01-14-2013-C
2.10
2.00 SQ
1.90
Figure 27. 8-Lead Lead Frame Chip Scale Package [LFCSP]
2.00 mm × 2.00 mm Body, and 0.55 mm Package Height
(CP-8-10)
Dimensions shown in millimeters
ORDERING GUIDE
Model 1 Temperature Range Package Description Package Option
ADL5726ACPZN-R7 −40°C to +85°C 8-Lead Lead Frame Chip Scale Package [LFCSP] CP-8-10
ADL5726-EVA L Z Evaluation Board
1 Z = RoHS-Compliant Part.
©2016 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
D14320-0-9/16( A)