Features and Benefits
- Wideband matched 9 kHz to 7 GHz operation
- Forward and reverse power and return loss measurement
- 49 dB ±1.0 dB input range with −19 dBm minimum input level, ±1.0 dB at 1 GHz
- Linear in dB rms (crest factor insensitive) outputs
- Insertion loss: 1.1 dB at 1 GHz and 1.9 dB at 6 GHz
- Input and output return loss and VSWR
- 1 GHz: 22 dB/1.16:1
- 3 GHz: 14 dB/1.5:1
- 6 GHz: 12 dB/1.7:1
- Output IP3: 70.5 dBm at 1 GHz
- 20 dB at 1 GHz
- 13 dB at 3 GHz
- 5 dB at 6 GHz
- Maximum input power
- 30 dBm for open or shorted termination
- 33 dBm for matched termination
The ADL5920 is an ultrawideband, bidirectional detector that simultaneously measures forward and reverse rms power levels in a signal path, along with the return loss.
The forward and reverse power traveling through the integrated bidirectional bridge is measured using two 50 dB linear in dB rms detectors. The detector output voltages, available at the VRMSF and VRMSR pins, are proportional to the forward and reflected power in dBm. A third, differential, output produces a voltage proportional to the return loss (reflection coefficient) in dB, closely related to the voltage standing wave ratio (VSWR). The common-mode level of this output is externally adjustable through the VOCM pin.
The primary transmission line of the bidirectional bridge, from RFIN to RFOUT (or vice versa) is dc-coupled and allows small 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 (relative to the dc voltage at RFIN and RFOUT). The internal detector circuitry is also dc-coupled to the directional bridge to support measurements down to 9 kHz.
The maximum input signal on each of the RF ports (RFIN and RFOOUT) is 30 dBm for open and shorted terminations and 33 dBm for a matched termination.
The ADL5920 draws 160 mA from a 5 V supply and has a low power, power-down mode controlled through the PWDN/TADJS pin.
The device is supplied in a 32-lead, 5 mm × 5 mm LFCSP and is specified for ambient operating temperatures in the −40°C to +85°C range.
Multifunction pin names may be referenced by their relevant function only.
- Industrial metering
- Broadband inline power and return loss measurement
- Transmit power control and automatic level control in wireless transmitters, signal generators, network analyzers, and wireless communications testers
- Condition based monitoring of system modules, cables, and connectors
Product Lifecycle Recommended for New Designs
This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.
Evaluation Kits (2)
ADL5920-EVALZ is a fully populated, 4-layer, FR4-based evaluation board. For normal operation, it requires a 5 V/200 mA power supply. The 5 V power supply should be connected to the VPOS and GND test loops. The RF input and load should be applied to the RFIN and RFOUT 2.92 mm connectors respectively (since the ADL5920 is fully bi-directional, the input signal can also be applied to RFOUT with the load on RFIN.) The output voltages are available on the VRMSR, VRMSF, VDIFF+ and VDIFF- SMA connectors or on the adjacent test loops.
The demonstration circuit (DC2847A) is a dual rms power detector with an integrated bidirectional bridge featuring the ADL5920 IC. The Arduino shield evaluates the ADL5920 with the Linduino board (DC2026C). The graphical user interface (GUI) allows the PC to measure and to monitor the forward and reverse power. Return loss is calculated and displayed on the PC.
The ADL5920 simultaneously measures forward and reverse rms power up to 7 GHz and provides return loss results. The ADL5920 detector has 50 dB of dynamic range at 1 GHz. The DC2847A-KIT requires an external power supply that connects to the DC2026C by setting Jumper JP1.
Features & Benefits
- Full featured evaluation kit for the ADL5920, specified from 9 kHz to 7 GHz
- Integrated bidirectional bridge that measures forward and reverse power
- Integrated dual channel rms power detector that measures forward and reverse RF power
- PC-based GUI that provides instant forward power, reverse power, and return loss information
Tools & Simulations
Product Selection Guide (1)
Technical Articles (2)
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.
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