50 MHz to 9 GHz 65 dB TruPwr Detector ADL5902 FEATURES FUNCTIONAL BLOCK DIAGRAM VPOS POS Accurate rms-to-dc conversion from 50 MHz to 9 GHz 3 10 Single-ended input dynamic range of 65 dB TEMPERATURE ADL5902 8 TEMP SENSOR No balun or external input matching required Waveform and modulation independent, such as 7 VSET 14 GSM/CDMA/W-CDMA/TD-SCDMA/WiMAX/LTE INHI I DET 2 X Linear-in-decibels output, scaled 53 mV/dB 15 INLO Transfer function ripple: <0.1 dB LINEAR-IN-dB VGA (NEGATIVE SLOPE) 2 X Temperature stability: <0.3 dB I TGT All functions temperature and supply stable NC 2 G = 5 6 VOUT Operates from 4.5 V to 5.5 V from 40C to +125C Power-down capability to 1.5 mW 16 NC VREF BIAS AND POWER- DOWN CONTROL 2.3V Pin-compatible with the 50 dB dynamic range AD8363 5 CLPF NC 13 APPLICATIONS 26pF 11 12 1 9 4 Power amplifier linearization/control loops TADJ/PWDN VREF VTGT COMM COMM Transmitter power controls Figure 1. Transmitter signal strength indication (TSSI) RF instrumentation GENERAL DESCRIPTION The ADL5902 is a true rms responding power detector that has logarithm of the rms value of the input. In other words, the a 65 dB measurement range when driven with a single-ended reading is presented directly in decibels and is scaled 1.06 V per 50 source. This feature makes the ADL5902 frequency decade, or 53 mV/dB other slopes are easily arranged. In versatile by eliminating the need for a balun or any other form controller mode, the voltage applied to VSET determines the of external input tuning for operation up to 9 GHz. power level required at the input to null the deviation from the set point. The output buffer can provide high load currents. The ADL5902 provides a solution in a variety of high frequency The ADL5902 has 1.5 mW power consumption when powered systems requiring an accurate measurement of signal power. Requiring only a single supply of 5 V and a few capacitors, it is down by a logic high applied to the PWDN pin. It powers up easy to use and capable of being driven single-ended or with a within approximately 5 s to its nominal operating current of balun for differential input drive. The ADL5902 can operate 73 mA at 25C. The ADL5902 is supplied in a 4 mm 4 mm, from 50 MHz to 9 GHz and can accept inputs from 62 dBm to 16-lead LFCSP for operation over the wide temperature range at least +3 dBm with large crest factors, such as GSM, CDMA, of 40C to +125C. W-CDMA, TD-SCDMA, WiMAX, and LTE modulated signals. The ADL5902 is also pin-compatible with the AD8363, 50 dB The ADL5902 can determine the true power of a high dynamic range TruPwr detector. This feature allows the designer to create one circuit layout for projects requiring frequency signal having a complex low frequency modulation envelope or can be used as a simple low frequency rms different dynamic ranges. A fully populated RoHS-compliant voltmeter. Used as a power measurement device, VOUT is evaluation board is available. connected to VSET. The output is then proportional to the Rev. A 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 www.analog.com license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Fax: 781.461.3113 20102011 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. 08218-001ADL5902 TABLE OF CONTENTS Features .............................................................................................. 1 VSET Interface............................................................................ 18 Applications....................................................................................... 1 Output Interface ......................................................................... 18 Functional Block Diagram .............................................................. 1 VTGT Interface .......................................................................... 19 General Description ......................................................................... 1 Basis for Error Calculations...................................................... 19 Revision History ............................................................................... 2 Measurement Mode Basic Connections.................................. 19 Specifications..................................................................................... 3 Setting V .................................................................................. 20 TADJ Absolute Maximum Ratings............................................................ 7 Setting V ................................................................................. 20 TGT ESD Caution.................................................................................. 7 Choosing a Value for C ............................................................ 20 LPF Pin Configuration and Function Descriptions............................. 8 Output Voltage Scaling.............................................................. 23 Typical Performance Characteristics ............................................. 9 System Calibration and Error Calculation.............................. 24 Theory of Operation ...................................................................... 15 High Frequency Performance................................................... 25 Square Law Detector and Amplitude Target .............................. 15 Low Frequency Performance.................................................... 25 RF Input Interface ...................................................................... 16 Description of Characterization............................................... 25 Small Signal Loop Response ..................................................... 17 Evaluation Board Schematics and Artwork................................ 26 Temperature Sensor Interface................................................... 17 Assembly Drawings.................................................................... 27 VREF Interface ........................................................................... 17 Outline Dimensions....................................................................... 28 Temperature Compensation Interface..................................... 17 Ordering Guide .......................................................................... 28 Power-Down Interface............................................................... 18 REVISION HISTORY 7/11Rev. 0 to Rev. A Updated Format..................................................................Universal Changes to Measurement Mode Basic Connections Section and Figure 45 .......................................................................................... 19 Changes to Setting V Section and Choosing a Value for TGT C Section...................................................................................... 20 LPF Changes to Output Voltage Scaling Section, Figure 49, and Table 7 .............................................................................................. 23 Changes to Figure 54 and Table 8................................................. 26 Changes to Figure 55 and Figure 56............................................. 27 4/10Revision 0: Initial Version Rev. A Page 2 of 28