1 MHz to 10 GHz, 45 dB Log Detector/Controller Data Sheet AD8319 FEATURES FUNCTIONAL BLOCK DIAGRAM VPOS TADJ Wide bandwidth: 1 MHz to 10 GHz High accuracy: 1.0 dB over temperature GAIN SLOPE BIAS I V VSET 45 dB dynamic range up to 8 GHz Stability over temperature: 0.5 dB Low noise measurement/controller output VOUT VOUT I V Pulse response time (fall/rise): 6 ns/10 ns DET DET DET DET CLPF Small footprint: 2 mm 3 mm LFCSP INHI Supply operation: 3.0 V to 5.5 V 22 mA INLO Fabricated using high speed SiGe process COMM Figure 1. APPLICATIONS RF transmitter PA setpoint controls and level monitoring Power monitoring in radiolink transmitters RSSI measurement in base stations, WLANs, WiMAX, and radars GENERAL DESCRIPTION The AD8319 is a demodulating logarithmic amplifier, capable The feedback loop through an RF amplifier is closed via VOUT, of accurately converting an RF input signal to a corresponding the output of which regulates the output of the amplifier to a decibel-scaled output. It employs the progressive compression magnitude corresponding to VSET. The AD8319 provides 0 V to technique over a cascaded amplifier chain, each stage of which (V 0.1 V) output capability at the VOUT pin, suitable for POS is equipped with a detector cell. The device can be used in either controller applications. As a measurement device, VOUT is measurement or controller modes. The AD8319 maintains externally connected to VSET to produce an output voltage, accurate log conformance for signals of 1 MHz to 8 GHz and V , that is a decreasing linear-in-dB function of the RF input OUT provides useful operation to 10 GHz. The input dynamic range signal amplitude. is typically 45 dB (re: 50 ) with error less than 3 dB. The The logarithmic slope is 22 mV/dB, determined by the VSET AD8319 has 6 ns/10 ns (fall time/rise time) response time that interface. The intercept is 15 dBm (re: 50 , CW input) using enables RF burst detection to a pulse rate of beyond 50 MHz. the INHI input. These parameters are very stable against supply The device provides unprecedented logarithmic intercept stability and temperature variations. vs. ambient temperature conditions. A supply of 3.0 V to 5.5 V The AD8319 is fabricated on a SiGe bipolar IC process and is is required to power the device. Current consumption is typically available in a 2 mm 3 mm, 8-lead LFCSP for an operating 22 mA, and it decreases to 200 A when the device is disabled. temperature range of 40C to +85C. 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. Rev. D Document Feedback Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. rights of third parties that may result from its use. Specifications subject to change without notice. No Tel: 781.329.4700 20052017 Analog Devices, Inc. All rights reserved. license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. Technical Support www.analog.com 05705-001AD8319* PRODUCT PAGE QUICK LINKS Last Content Update: 09/27/2017 COMPARABLE PARTS REFERENCE MATERIALS View a parametric search of comparable parts. Product Selection Guide RF Source Booklet EVALUATION KITS Technical Articles AD8319 Evaluation Board Design a Logamp RF Pulse Detector Detecting Fast RF Bursts using Log Amps DOCUMENTATION Log Amps and Directional Couplers Enable VSWR Application Notes Detection AN-1040: RF Power Calibration Improves Performance of Make Precise Base-Station Power Measurements Wireless Transmitters Measurement and Control of RF Power, Part I Data Sheet Measurement and Control of RF Power, Part II AD8319: 1 MHz to 10 GHz, 45 dB Log Detector/Controller Measurement and Control of RF Power, Part III Data Sheet Measuring the RF Power in CDMA2000 and W-CDMA High Power Amplifiers (HPAs) TOOLS AND SIMULATIONS Measuring VSWR and Gain in Wireless Systems ADIsimPLL ADIsimRF DESIGN RESOURCES AD8319 Material Declaration REFERENCE DESIGNS PCN-PDN Information CN0082 Quality And Reliability Symbols and Footprints DISCUSSIONS View all AD8319 EngineerZone Discussions. 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