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AD8362:  50 Hz TO 3.8 GHz 65 dB TruPwr™ Detector

Product Details


The AD8362 is a true rms-responding power detector that has a 65 dB measurement range. It is intended for use in a variety of high frequency communication systems and in instrumentation requiring an accurate response to signal power. It is easy to use, requiring only a single supply of 5 V and a few capacitors. It can operate from arbitrarily low frequencies to over 3.8 GHz and can accept inputs that have rms values from 1 mV to at least 1 V rms, with large crest factors, exceeding the requirements for accurate measurement of CDMA signals.

The input signal is applied to a resistive ladder attenuator that comprises the input stage of a variable gain amplifier (VGA). The 12 tap points are smoothly interpolated using a proprietary technique to provide a continuously variable attenuator, which is controlled by a voltage applied to the VSET pin. The resulting signal is applied to a high performance broadband amplifier. Its output is measured by an accurate square-law detector cell. The fluctuating output is then filtered and compared with the output of an identical squarer, whose input is a fixed dc voltage applied to the VTGT pin, usually the accurate reference of 1.25 V pro-vided at the VREF pin.

The difference in the outputs of these squaring cells is integrated in a high gain error amplifier, generating a voltage at the VOUT pin with rail-to-rail capabilities. In a controller mode, this low noise output can be used to vary the gain of a host system’s RF amplifier, thus balancing the setpoint against the input power. Optionally, the voltage at VSET can be a replica of the RF signal’s amplitude modulation, in which case the overall effect is to remove the modulation component prior to detection and low-pass filtering. The corner frequency of the averaging filter can be lowered without limit by adding an external capacitor at the CLPF pin. The AD8362 can be used to determine the true power of a high frequency signal having a complex low frequency modulation envelope, or simply as a low frequency rms volt-meter. The high-pass corner generated by its offset-nulling loop can be lowered by a capacitor added on the CHPF pin.

Used as a power measurement device, VOUT is strapped to VSET. The output is then proportional to the logarithm of the rms value of the input. In other words, the reading is presented directly in decibels and is conveniently scaled 1 V per decade, or 50 mV/dB; other slopes are easily arranged. In controller modes, the voltage applied to VSET determines the power level required at the input to null the deviation from the setpoint. The output buffer can provide high load currents.

The AD8362 has 1.3 mW power consumption when powered down by a logic high applied to the PWDN pin. It powers up within about 20 μs to its nominal operating current of 20 mA at 25°C. The AD8362 is supplied in a 16-lead TSSOP for operation over the temperature range of −40°C to +85°C.

Applications

  • Power amplifier linearization/control loops
  • Transmitter power controls
  • Transmitter signal strength indication (TSSI)
  • RF instrumentation
  • Data Sheet, Rev. D, 6/07

    FEATURES and BENEFITS

    • Complete fully calibrated measurement/control system
    • Accurate rms-to-dc conversion from 50 Hz to 3.8 GHz
    • Input dynamic range of >65 dB: −52 dBm to
      +8 dBm in 50 Ω
    • Waveform and modulation independent, such as GSM/CDMA/TDMA
    • Linear-in-decibels output, scaled 50 mV/dB
    • Law conformance error of 0.5 dB
    • All functions temperature and supply stable
    • Operates from 4.5 V to 5.5 V at 24 mA
    • Power-down capability to 1.3 mW

    Functional Block Diagram for AD8362

    Documentation

    Title Content Type File Type
    AD8362: 50 Hz to 3.8 GHz 65 dB TruPwr™ Detector Data Sheet (Rev E, 12/2012) (pdf, 2020 kB) Data Sheets PDF
    AN-1040: RF Power Calibration Improves Performance of Wireless Transmitters  (pdf, 152 kB) Application Notes PDF
    AN-691: Operation of RF Detector Products at Low Frequency  (pdf, 778 kB) Application Notes PDF
    AN-653: Improving Temperature, Stability, and Linearity of High Dynamic Range RMS RF Power Detectors  (pdf, 415 kB) Application Notes PDF
    Design and Operation of Automatic Gain Control Loops for Receivers in Modern Communication Systems  (pdf, 129 kB) Tutorials PDF
    Measurement and Control of RF Power
    by Eamon Nash, Analog Devices, Inc.
    Technical Articles HTML
    Log Amps and Directional Couplers Enable VSWR Detection  (pdf, 2223 kB)
    by Anil Rachakonda and Larry Hawkins, Analog Devices, Inc. (RF Design, 1/1/2007)
    Technical Articles PDF
    Measuring VSWR and Gain in Wireless Systems  (pdf)
    By Eamon Nash, Analog Devices Inc., (Microwave Journal, Nov 2005)
    Technical Articles PDF
    Measuring the RF Power in CDMA2000 and W-CDMA High Power Amplifiers (HPAs)  (pdf, 609 kB)
    By Larry Hawkins, Analog Devices, Inc. (MPD Digest, Nov. 2005)
    Technical Articles PDF
    Design a Logamp RF Pulse Detector  (pdf, 338 kB)
    by Eamon Nash
    (Microwaves & RF, January 1, 2000)
    Technical Articles PDF
    RF Source Booklet  (PDF, 4353 kB)
    RF IC Product Overview - Version P (02/2014)
    Overview PDF
    RAQs index Rarely Asked Questions HTML
    Glossary of EE Terms Glossary HTML

    Design Tools,Models,Drivers & Software

    Title Content Type File Type
    ADIsimRF
    ADI’s ADIsimRF design tool provides calculations for the most important parameters within the RF signal chain, including cascaded gain, noise figure, IP3, P1dB, and total power consumption.
    ADIsim Design/Simulation Tools HTML
    ADIsimPLL™- Version 3.60.10
    ADIsimPLL enables the rapid and reliable evaluation of new high performance PLL products from ADI. It is the most comprehensive PLL Synthesizer design and simulation tool available today. Simulations performed include all key non-linear effects that are significant in affecting PLL performance. ADIsimPLL removes at least one iteration from the design process, thereby speeding the design- to-market.
    ADIsim Design/Simulation Tools HTML
    AD8362 S-Parameters  (zip, 14 kB) S-Parameters ZIP

    Evaluation Kits & Symbols & Footprints

    Evaluation Boards & KitsView the Evaluation Boards and Kits page for documentation and purchasing

    Symbols and Footprints— Analog Devices offers Symbols & Footprints which are compatible with a large set of today’s CAD systems for broader and easier support.

    Product Recommendations & Reference Designs

    Companion Products

    Suggested Companion Products


    Recommended Low-Noise Voltage Regulators for the AD8362

    • For a fixed 5V, 300mA low dropout regulator with reverse current protection, we recommend the ADP7102.
    Recommended Power Solutions
    • For selecting voltage regulator products, use ADIsimPower.

    Were these recommendations helpful?

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    Price, packaging, availability

    AD8362 Model Options
    Model Package Pins Temp.
    Range
    Packing,
    Qty
    Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
    Purchase/Sample
    AD8362ARU Status: Production 16 ld TSSOP 16 Ind Tube, 96 $8.77 $7.31 N  Material Info PCN Purchase
    AD8362ARU-REEL7 Status: Last Time Buy 16 ld TSSOP 16 Ind Reel, 1000 - - N  Material Info PCN Purchase
    AD8362ARUZ Status: Production 16 ld TSSOP 16 Ind Tube, 96 $7.59 $6.33 Y  Material Info PCN Purchase Sample
    AD8362ARUZ-REEL7 Status: Production 16 ld TSSOP 16 Ind Reel, 1000 - $6.33 Y  Material Info PCN Purchase
    Price Table Help

    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.

    AD8362 Evaluation Board
    Model Description Price RoHS View PCN/ PDN Check Inventory/
    Purchase/Sample
    AD8362-EVALZ Status: Production Evaluation Board $140.00 Yes -

    Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.

    Check Inventory & Purchase

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