200 MHz to 6 GHz 35 dB TruPwr Detector Data Sheet ADL5903 FEATURES FUNCTIONAL BLOCK DIAGRAM VPOS CREG Accurate rms-to-dc conversion from 200 MHz to 6 GHz 5 4 Measurement dynamic range of 35 dB ADL5903 INTERNAL Ripple-free transfer function FILTERING 6 ENBL 1k 630pF Single-ended input, 50 source compatible 3 CRMS No external matching required 4pF Waveform and modulation independent, such as 100 1 7 RFIN RMS CORE VRMS GSM/CDMA/W-CDMA/TD-SCDMA/LTE BUFFER Linear in decibels output, scaled 35.5 mV/dB at 900 MHz 2 8 Excellent temperature stability GND NIC EP Operates from 3.0 V to 5.0 V from 55C to +125C Figure 1. Low power consumption: 3 mA at 3.0 V to 5.0 V supply 8-lead, 2 mm 2 mm LFCSP package APPLICATIONS Power amplifier linearization/control loops Transmitter power controls Transmitter signal strength indication (TSSI) RF instrumentation Wireless repeaters GENERAL DESCRIPTION The ADL5903 is a true rms responding power detector that has The ADL5903 can be used to determine the true power of a a 35 dB measurement range. It features low power consumption high frequency signal with a complex modulation envelope and an intrinsically ripple-free error transfer function. including large crest factor signals such as GSM, CDMA, W-CDMA, TD-SCDMA, and LTE modulated signals. The The ADL5903 provides a solution in a variety of high frequency output is then proportional to the logarithm of the rms value systems requiring an accurate measurement of signal power. of the input. In other words, the reading is presented directly Requiring only a single supply of 3.0 V to 5.0 V and a few in decibels and is scaled about 35.5 mV/dB at 900 MHz. capacitors, it is easy to use and capable of being driven single- ended or with a balun for differential input drive. An on-chip The ADL5903 has low power consumption when operational matching network provides good return loss over the specified and a disable mode that further reduces the power consumption. frequency range of the device. The ADL5903 can operate from Power consumption is less than 100 A when the ADL5903 200 MHz to 6 GHz and can accept inputs from 30 dBm to enters power-down mode through a logic low at Pin ENBL. +20 dBm. The ADL5903 is supplied in a 2 mm 2 mm, 8-lead LFCSP for operation over the wide temperature range of 55C to +125C. Rev. B 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 20132015 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 11769-001ADL5903 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Measurement Setups ...................................................................... 14 Applications ....................................................................................... 1 Theory of Operation ...................................................................... 15 Functional Block Diagram .............................................................. 1 RF Input Interface ...................................................................... 15 General Description ......................................................................... 1 Basic Connections ...................................................................... 15 Revision History ............................................................................... 2 Choosing a Value for C ......................................................... 16 RMS Specifications ..................................................................................... 3 Device Calibration and Error Calculation .............................. 17 Absolute Maximum Ratings ............................................................ 6 Evaluation Board Schematic and Configuration Options ........ 19 ESD Caution .................................................................................. 6 Outline Dimensions ....................................................................... 20 Pin Configuration and Function Descriptions ............................. 7 Ordering Guide .......................................................................... 20 Typical Performance Characteristics ............................................. 8 REVISION HISTORY 5/15Rev. A to Rev. B Changes to Figure 49 ...................................................................... 19 2/15Rev. 0 to Rev. A Added ADL5903ACPZN Operating Temperature Range of 40C to +85C Table 2 .................................................................. 6 Changes to Ordering Guide .......................................................... 20 10/13Revision 0: Initial Version Rev. B Page 2 of 20