50 MHz to 3.5 GHz, 45 dB RF Detector Data Sheet AD8312 FEATURES GENERAL DESCRIPTION Complete RF detector function The AD8312 is a complete, low cost subsystem for the Typical range: 45 dBm to 0 dBm, referencing 50 measurement of radio frequency (RF) signals in the frequency Frequency response from 50 MHz to 3.5 GHz range of 50 MHz to 3.5 GHz. It has a typical dynamic range of Temperature stable linear in dB response 45 dB and is intended for use in a wide variety of cellular handsets Accurate to 3.5 GHz and other wireless devices. It provides a wider dynamic range Rapid response: 85/120 ns (rise/fall) and better accuracy than possible using discrete diode detectors. In Low power: 12 mW at 2.7 V particular, its temperature stability is excellent over the full operating range of 40C to +85C. Its high sensitivity allows APPLICATIONS measurement at low power levels, thus reducing the amount of Cellular handsets (GSM, CDMA, WCDMA) power that needs to be coupled to the detector. It is essentially a RSSI and TSSI for wireless terminal devices voltage responding device, with a typical signal range of 1.25 mV Transmitter power measurement to 224 mV rms or 45 dBm to 0 dBm, referencing 50 . For convenience, the signal is internally ac-coupled, using a 5 pF capacitor to a load of 3 k in shunt with 1.3 pF. This high- pass coupling, with a corner at approximately 16 MHz, determines the lowest operating frequency. Therefore, the source may be dc grounded. The AD8312 output, VOUT, increases from close to ground to about 1.2 V because the input signal level increases from 1.25 mV to 224 mV. A capacitor may be connected between the VOUT and CFLT pins when it is desirable to increase the time interval over which averaging of the input waveform occurs. The AD8312 is available in a 6-ball, 1.0 mm 1.5 mm, wafer level chip scale package and consumes 4.2 mA from a 2.7 V to 5.5 V supply. FUNCTIONAL BLOCK DIAGRAM CFLT V-I VSET + VOUT I-V DET DET DET DET DET RFIN BAND-GAP 10dB 10dB 10dB 10dB VPOS REFERENCE OFFSET AD8312 COMPENSATION COMM Figure 1. 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 20052015 Analog Devices, Inc. All rights reserved. license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Technical Support www.analog.com Trademarks and registered trademarks are the property of their respective owners. 05260-001AD8312 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Transfer Function in Terms of Slope and Intercept ............... 13 Applications ....................................................................................... 1 Filter Capacitor ....................................................................... 14 General Description ......................................................................... 1 Input Coupling Options ........................................................ 14 Functional Block Diagram .............................................................. 1 Increasing the Logarithmic Slope ........................................ 15 Revision History ............................................................................... 2 Effect of Waveform Type on Intercept ................................ 15 Specifications ..................................................................................... 3 Temperature Drift .................................................................. 16 Absolute Maximum Ratings ............................................................ 6 Operation Above 2.5 GHz .................................................... 16 ESD Caution .................................................................................. 6 Device Handling ..................................................................... 16 Pin Configuration and Function Descriptions ............................. 7 Evaluation Board .................................................................... 16 Typical Performance Characteristics ............................................. 8 Outline Dimensions ....................................................................... 19 General Description ....................................................................... 12 Ordering Guide .......................................................................... 19 Applications ..................................................................................... 13 Basic Connections ...................................................................... 13 REVISION HISTORY 12/15Rev. A to Rev. B Change to Figure 30 Caption ........................................................ 16 1/11Rev. 0 to Rev. A Changes to Figure 29 ...................................................................... 16 Updated Outline Dimensions ....................................................... 19 Changes to Ordering Guide .......................................................... 19 4/05Revision 0: Initial Version Rev. B Page 2 of 20