LF to 2.7 GHz, DUAL 60 dB TruPwr™ Detector
The AD8364 is a true rms, responding, dual-channel RF power measurement subsystem for the precise measurement and control of signal power. The flexibility of the AD8364 allows communications systems, such as RF power amplifiers and radio transceiver AGC circuits, to be monitored and controlled with ease. Operating on a single 5 V supply, each channel is fully specified for operation up to 2.7 GHz over a dynamic range of 60 dB. The AD8364 provides accurately scaled, independent, rms outputs of both RF measurement channels. Difference output ports, which measure the difference between the two channels, are also available. The on-chip channel matching makes the rms channel difference outputs extremely stable with temperature and process variations. The device also includes a useful temperature sensor with an accurately scaled voltage proportional to temperature, specified over the device operating temperature range. The AD8364 can be used with input signals having rms values from −55 dBm to +5 dBm referred to 50 Ω and large crest factors with no accuracy degradation.
Integrated in the AD8364 are two matched AD8362 channels (see the AD8362 data sheet for more information) with improved temperature performance and reduced log conformance ripple. Enhancements include improved temperature performance and reduced log-conformance ripple compared to the AD8362. On-chip wide bandwidth output operational amplifiers are connected to accom-modate flexible configurations that support many system solutions.
The device can easily be configured to provide four rms measurements simultaneously. Linear-in-dB rms measurements are supplied at OUTA and OUTB, with conveniently scaled slopes of 50 mV/dB. The rms difference between OUTA and OUTB is available as differential or single-ended signals at OUTP and OUTN. An optional voltage applied to VLVL provides a common mode reference level to offset OUTP and OUTN above ground.
The AD8364 is supplied in a 32-lead, 5 mm × 5 mm LFCSP, for the operating temperature of –40°C to +85°C.
- Wireless infrastructure power amplifier linearization/control
- Antenna VSWR monitor
- Gain and power control and measurement
- Transmitter signal strength indication (TSSI)
- Dual-channel wireless infrastructure radios
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.
AD8364-EVALZ is a fully populated, 4-layer, FR4-based evaluation board. For normal operation, it requires a 5 V/100 mA power supply. The 5 V power supply should be connected to the clip leads labeled VPS and COMM1. The two RF input signals are applied to two edge-mounted SMA type RF connectors. The output signals are accessible via the OUTA, OUTB, OUTN, OUTP and TEMP clip leads. The circuit board can also accommodate 6-pin and 26-pin headers through which the power supply, ground, temperature adjust nodes and output signal pins are accessible (the circuit board ships with these headers not installed).
Measuring VSWR and Gain in Wireless Systems
By Eamon Nash, Analog Devices Inc., (Microwave Journal, Nov 2005)
Measuring the RF Power in CDMA2000 and W-CDMA High Power Amplifiers (HPAs)
By Larry Hawkins, Analog Devices, Inc. (MPD Digest, Nov. 2005)
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.
The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.