Datasheet ADL5902 (Analog Devices)

50 MHz to 9 GHz 65 dB TruPwr Detector Data Sheet 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 ADL5902 TEMPERATURE 8 TEMP No balun or external input matching required SENSOR Waveform and modulation independent, such as 7 VSET GSM/CDMA/W-CDMA/TD-SCDMA/WiMAX/LTE INHI 14 IDET X2 Linear-in-decibels output, scaled 53 mV/dB INLO 15 Transfer function ripple: <±0.1 dB LINEAR-IN-dB VGA (NEGATIVE SLOPE) Temperature stability: <±0.3 dB X2 ITGT All functions temperature and supply stable NC 2 G = 5 6 VOUT Operates from 4.5 V to 5.5 V from −40°C to +125°C Power-down capability to 1.5 mW NC 16 BIAS AND POWER- VREF Pin-compatible with the 50 dB dynamic range AD8363 DOWN CONTROL 2.3V NC 5 13 CLPF APPLICATIONS 26pF
001
1 11 12 9 4 Power amplifier linearization/control loops
8- 821
TADJ/PWDN VREF VTGT COMM COMM
0
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 reading a 65 dB measurement range when driven with a single-ended is presented directly in decibels and is scaled 1.06 V per decade, 50 Ω source. This feature makes the ADL5902 frequency or 53 mV/dB; other slopes are easily arranged. In controller mode, versatile by eliminating the need for a balun or any other form the voltage applied to VSET determines the power level required at of external input tuning for operation up to 9 GHz. the input to null the deviation from the set point. The output The ADL5902 provides a solution in a variety of high frequency buffer can provide high load currents. systems requiring an accurate measurement of signal power. The ADL5902 has 1.5 mW power consumption when powered 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 μs to the nominal operating current of balun for differential input drive. The ADL5902 can operate 73 mA at 25°C. 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 −40°C to +125°C. 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 frequency signal having a complex low frequency modulation designer to create one circuit layout for projects requiring 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. 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 rights of third parties that may result from its use. Specifications subject to change without notice. No One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Tel: 781.329.4700 ©2010–2016 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. Technical Support www.analog.com
Document Outline FEATURES APPLICATIONS FUNCTIONAL BLOCK DIAGRAM GENERAL DESCRIPTION REVISION HISTORY SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS THEORY OF OPERATION SQUARE LAW DETECTOR AND AMPLITUDE TARGET RF INPUT INTERFACE SMALL SIGNAL LOOP RESPONSE TEMPERATURE SENSOR INTERFACE VREF INTERFACE TEMPERATURE COMPENSATION INTERFACE POWER-DOWN INTERFACE VSET INTERFACE OUTPUT INTERFACE VTGT INTERFACE BASIS FOR ERROR CALCULATIONS MEASUREMENT MODE BASIC CONNECTIONS SETTING VTADJ SETTING VTGT CHOOSING A VALUE FOR CLPF OUTPUT VOLTAGE SCALING SYSTEM CALIBRATION AND ERROR CALCULATION HIGH FREQUENCY PERFORMANCE LOW FREQUENCY PERFORMANCE DESCRIPTION OF CHARACTERIZATION EVALUATION BOARD SCHEMATICS AND ARTWORK ASSEMBLY DRAWINGS OUTLINE DIMENSIONS ORDERING GUIDE