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ADL5726 Schematic ( PDF Datasheet ) - Analog Devices

Teilenummer ADL5726
Beschreibung Low Noise Amplifier
Hersteller Analog Devices
Logo Analog Devices Logo 




Gesamt 14 Seiten
ADL5726 Datasheet, Funktion
Data Sheet
21.2 GHz to 23.6 GHz, Low Noise Amplifier
ADL5726
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
VCC1
ADL5726
VCC2
50GND
SINGLE-ENDED
INPT
OUTN 100
OUTP DIFFERENTIAL
RBIAS
DNC
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.
Rev. A
Document Feedback
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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.
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Tel: 781.329.4700
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Technical Support
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ADL5726 Datasheet, Funktion
Data Sheet
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
ADL5726
VCC1 1
GND 2
INPT 3
RBIAS 4
ADL5726
TOP VIEW
(Not to Scale)
8 VCC2
7 OUTN
6 OUTP
5 DNC
NOTES
1. DNC = DO NOT CONNECT. DO NOT
CONNECT TO THIS PIN.
2. 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.
Rev. A | Page 5 of 13

6 Page









ADL5726 pdf, datenblatt
Data Sheet
EVALUATION BOARD
The ADL5726-EVALZ 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-
EVALZ lab bench setup.
INITIAL SETUP
To set up the ADL5726-EVALZ, take the following steps:
1. Power up the ADL5726-EVALZ 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-
EVALZ.
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-EVALZ lab bench setup.
ADL5726
RESULTS
Figure 24 shows the expected results when testing the
ADL5726-EVALZ 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.
20
RESOLUTION BANDWIDTH = 20kHz
10
VIDEO BANDWIDTH = 20kHz
SWEEP = 301ms (1001pts)
1
0
–10
–20
–30
–40
–50
–60
–70
–80
21.15 21.16 21.17 21.18 21.19 21.20 21.21 21.22 21.23 21.24 21.25
FREQUENCY (GHz)
Figure 24. Test Results at 21.2 GHz
+5V DC GND
INPUT
RF FREQUENCY GENERATOR
RFON
RFOP
SPECTRUM
ANALYZER
180° HYBRID FOR DIFFERENTIAL
TO SINGLE ENDED OUTPUT
Figure 25. ADL5726-EVALZ Lab Bench Setup
Rev. A | Page 11 of 13

12 Page





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