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AD8319:  1 MHz TO 10 GHz, 40 dB Log Detector / Controller

Product Details

Product Status:Recommended for New Designs

The AD8319 is a demodulating logarithmic amplifier, capable of accurately converting an RF input signal to a corresponding decibel-scaled output. It employs the progressive compression technique over a cascaded amplifier chain, each stage of which is equipped with a detector cell. The device can be used in either measurement or controller modes. The AD8319 maintains accurate log conformance for signals of 1 MHz to 8 GHz and provides useful operation to 10 GHz. The input dynamic range is typically 40 dB (re: 50 Ω) with error less than ±1 dB. The AD8319 has 8 ns/10 ns response time (fall time/rise time) that enables RF burst detection to a pulse rate of beyond 50 MHz. The device provides unprecedented logarithmic intercept stability vs. ambient temperature conditions. A supply of 3.0 V to 5.5 V is required to power the device. Current consumption is typically 22 mA, and it decreases to 200 μA when the device is disabled.

The AD8319 can be configured to provide a control voltage to a power amplifier or a measurement output from the VOUT pin. Because the output can be used for controller applications, special attention was paid to minimize wideband noise. In this mode, the setpoint control voltage is applied to the VSET pin.

The feedback loop through an RF amplifier is closed via VOUT, the output of which regulates the amplifier’s output to a magnitude corresponding to VSET. The AD8319 provides 0 V to (VPOS − 0.1 V) output capability at the VOUT pin, suitable for controller applications. As a measurement device, VOUT is externally connected to VSET to produce an output voltage, VOUT, that is a decreasing linear-in-dB function of the RF input signal amplitude.

The logarithmic slope is −22 mV/dB, determined by the VSET interface. The intercept is 15 dBm (re: 50 Ω, CW input) using the INHI input. These parameters are very stable against supply and temperature variations.

The AD8319 is fabricated on a SiGe bipolar IC process and is available in a 2 mm × 3 mm, 8-lead LFCSP_VD for an operating temperature range of −40°C to +85°C.


  • RF transmitter PA setpoint controls and level monitoring
  • Power monitoring in radiolink transmitters
  • RSSI measurement in base stations, WLANs, WiMAX, and radars
  • Data Sheet, Rev. A, 3/07


    • Wide bandwidth: 1 MHz to 10 GHz
    • High accuracy: ±1.0 dB over temperature
    • >40 dB dynamic range up to 8 GHz
    • Stability over temperature ±0.5 dB
    • Low noise measurement/controller
      output VOUT
    • Pulse response time: 8 ns/10 ns (fall/rise)
    • Small footprint 2 mm × 3 mm LFCSP_VD
    • Supply operation: 3.0 V to 5.5 V @ 22 mA
    • Fabricated using high speed SiGe process

    Functional Block Diagram for AD8319


    Title Content Type File Type
    AD8319: 1 MHz to 10 GHz, 45 dB Log Detector/Controller Data Sheet (Rev C, 03/2013) (pdf, 1310 kB) Data Sheets PDF
    AN-1040: RF Power Calibration Improves Performance of Wireless Transmitters  (pdf, 152 kB) Application Notes PDF
    CN-0082: Creating a Constant Envelope Signal Using the ADL5331 RFVGA and AD8319 Log Detector  (pdf, 263 kB) Circuit Note PDF
    Measurement and Control of RF Power
    by Eamon Nash, Analog Devices, Inc.
    Technical Articles HTML
    Detecting Fast RF Bursts using Log Amps  (pdf, 174 kB)
    by Yuping Toh, Analog Devices, Inc.
    Technical Articles PDF
    Make Precise Base-Station Power Measurements  (pdf, 1764 kB)
    (Microwaves and RF, November 2002)
    Technical Articles PDF
    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
    Industrial Applications Overview HTML
    RAQs index Rarely Asked Questions HTML
    What is an RF Detector, and how is it used? FAQs/RAQs HTML
    Glossary of EE Terms Glossary HTML

    Design Tools,Models,Drivers & Software

    Title Content Type File Type
    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

    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

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    Price, packaging, availability

    AD8319 Model Options
    Model Package Pins Temp.
    Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
    AD8319ACPZ-R2 Status: Production 8 ld LFCSP (2x3x.85mm) 8 Ind Reel, 250 - - Y  Material Info Notify Me Purchase
    AD8319ACPZ-R7 Status: Production 8 ld LFCSP (2x3x.85mm) 8 Ind Reel, 3000 - $1.77 Y  Material Info Notify Me Purchase Sample
    AD8319ACPZ-WP Status: Production 8 ld LFCSP (2x3x.85mm) 8 Ind Tray, 50 $4.05 $4.05 Y  Material Info Notify Me 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.

    AD8319 Evaluation Board
    Model Description Price RoHS View PCN/ PDN Check Inventory/
    AD8319-EVALZ Status: Production Evaluation Board $100.19 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.

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