9 kHz to 7 GHz, Bidirectional RMS and VSWR Detector Data Sheet ADL5920 FEATURES FUNCTIONAL BLOCK DIAGRAM Wideband matched 9 kHz to 7 GHz operation Forward and reverse power and return loss measurement 30 29 28 27 24 1 49 dB 1.0 dB input range with 19 dBm minimum input level, ADL5920 1.0 dB at 1 GHz 31 26 RFIN RFOUT 32 BIDIRECTIONAL BRIDGE 25 Linear in dB rms (crest factor insensitive) outputs Insertion loss: 1.1 dB at 1 GHz and 1.9 dB at 6 GHz VNEG1 2 23 VNEG2 Input and output return loss and VSWR CHPR+ 3 21 CHPF+ 1 GHz: 22 dB/1.16:1 3 GHz: 14 dB/1.5:1 CHPR 4 22 CHPF REVERSE FORWARD PATH PATH 6 GHz: 12 dB/1.7:1 CRMSR 9 RMS RMS 16 CRMSF DETECTOR DETECTOR Output IP3: 70.5 dBm at 1 GHz Directivity VRMSR 7 18 VRMSF 20 dB at 1 GHz 12 DECL 13 dB at 3 GHz 5 dB at 6 GHz 10 VOCM VREF Maximum input power 19 VREF VTEMP 6 TEMPERATURE 2.5V SENSOR 30 dBm for open or shorted termination 15 VTGT 33 dBm for matched termination 20 TADJI PWDN/ APPLICATIONS 5 TADJS 813 1114 17 Industrial metering Broadband inline power and return loss measurement Transmit power control and automatic level control in Figure 1. wireless transmitters, signal generators, network analyzers, and wireless communications testers Condition based monitoring of system modules, cables, and connectors GENERAL DESCRIPTION The ADL5920 is an ultrawideband, bidirectional detector that (relative to the dc voltage at RFIN and RFOUT). The internal simultaneously measures forward and reverse rms power levels detector circuitry is also dc-coupled to the bidirectional bridge in a signal path, along with the return loss. to support measurements down to 9 kHz. The forward and reverse power traveling through the The maximum input signal on each of the RF ports (RFIN and integrated bidirectional bridge is measured using two 50 dB RFOOUT) is 30 dBm for open and shorted terminations and linear in dB rms detectors. The detector output voltages, 33 dBm for a matched termination. available at the VRMSF and VRMSR pins, are proportional to The ADL5920 draws 160 mA from a 5 V supply and has a low the forward and reflected power in dBm. A third, differential, power, power-down mode controlled through the output produces a voltage proportional to the return loss PWDN/TADJS pin. (reflection coefficient) in dB, closely related to the voltage The device is supplied in a 32-lead, 5 mm 5 mm LFCSP and is standing wave ratio (VSWR). The common-mode level of this specified for ambient operating temperatures in the 40C to output is externally adjustable through the VOCM pin. +85C range. The primary transmission line of the bidirectional bridge, from Multifunction pin names may be referenced by their relevant RFIN to RFOUT (or vice versa) is dc-coupled and allows small function only. amounts of dc bias current through the bridge. When dc-coupled to source and load, the positive and negative supply pins of the ADL5920 must be connected to +5 V and 2.5 V, respectively Rev. B 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 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. rights of third parties that may result from its use. Specifications subject to change without notice. No Tel: 781.329.4700 2019 Analog Devices, Inc. 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VPOS1 GND6 VPOS2 GND5 VDIFF GND4 VDIFF+ GND3 GND2 VPOS3 GND1 16085-0 01ADL5920 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Basic Connections ...................................................................... 18 Applications ....................................................................................... 1 CHPR, CHPF Capacitors .......................................................... 18 Functional Block Diagram .............................................................. 1 VREF Interface ........................................................................... 19 General Description ......................................................................... 1 VDIFF Output Interface ............................................................ 19 Revision History ............................................................................... 2 Temperature Drift Compensation ........................................... 19 Specifications ..................................................................................... 3 Setting VTGT.............................................................................. 19 Absolute Maximum Ratings ............................................................ 8 Choosing Values for CRMSF and CRMSR ............................. 20 Thermal Resistance ...................................................................... 8 RF Power and Return Loss Calculation .................................. 21 ESD Caution .................................................................................. 8 DC-Coupled Operation............................................................. 22 Pin Configuration and Function Descriptions ............................. 9 Evaluation Board ............................................................................ 23 Typical Performance Characteristics ........................................... 11 Outline Dimensions ....................................................................... 26 Theory of Operation ...................................................................... 17 Ordering Guide .......................................................................... 26 Applications Information .............................................................. 18 REVISION HISTORY 12/2019Rev. A to Rev. B 3/2019Rev. 0 to Rev. A Changes to Applications Section and Figure 1 ............................. 1 Changes to Ordering Guide .......................................................... 26 Changes to Figure 38 ...................................................................... 18 Changes to RF Power and Return Loss Calculation Section .... 21 1/2019Revision 0: Initial Version Changes to Figure 43 ...................................................................... 22 Rev. B Page 2 of 26