Datasheet ADL5920 (Analog Devices)

9 kHz to 7 GHz, Bidirectional RMS and VSWR Detector Data Sheet ADL5920 FEATURES FUNCTIONAL BLOCK DIAGRAM 6 5 4 3 2 1 Wideband matched 9 kHz to 7 GHz operation D D D D D D GN GN GN GN GN GN 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 Linear in dB rms (crest factor insensitive) outputs 32 BIDIRECTIONAL BRIDGE 25 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 1 GHz: 22 dB/1.16:1 CHPR+ 3 21 CHPF+ 3 GHz: 14 dB/1.5:1 CHPR– 4 REVERSE FORWARD 22 CHPF– 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 20 dB at 1 GHz VRMSR 7 18 VRMSF 13 dB at 3 GHz 12 DECL 5 dB at 6 GHz 10 VOCM Maximum input power VREF VTEMP 6 TEMPERATURE 19 VREF 2.5V 30 dBm for open or shorted termination SENSOR 15 VTGT 33 dBm for matched termination 20 TADJI APPLICATIONS PWDN/ 5 TADJS 8 13 11 14 17 Industrial metering + S1 S2 F S3
01
Broadband inline power and return loss measurement F IFF–
-0 085
VPO VPO D DI V V VPO
16
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 standing wave ratio (VSWR). The common-mode level of this The device is supplied in a 32-lead, 5 mm × 5 mm LFCSP and is output is externally adjustable through the VOCM pin. specified for ambient operating temperatures in the −40°C to +85°C range. The primary transmission line of the bidirectional bridge, from RFIN to RFOUT (or vice versa) is dc-coupled and allows small Multifunction pin names may be referenced by their relevant amounts of dc bias current through the bridge. When dc-coupled function only. to source and load, the positive and negative supply pins of the ADL5920 must be connected to +5 V and −2.5 V, respectively
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Document Outline Features Applications Functional Block Diagram General Description Revision History Specifications Absolute Maximum Ratings Thermal Resistance ESD Caution Pin Configuration and Function Descriptions Typical Performance Characteristics Theory of Operation Applications Information Basic Connections CHPR± and CHPF± Capacitors VREF Interface VDIFF Output Interface Temperature Drift Compensation Setting VTGT Choosing Values for CRMSF and CRMSR RF Power and Return Loss Calculation DC-Coupled Operation Evaluation Board Outline Dimensions Ordering Guide