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AD8312ACBZ-P2 Datasheet(PDF) 1 Page - Analog Devices |
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AD8312ACBZ-P2 Datasheet(HTML) 1 Page - Analog Devices |
1 / 20 page 50 MHz to 3.5 GHz, 45 dB RF Detector AD8312 Rev. 0 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 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. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.461.3113 © 2005 Analog Devices, Inc. All rights reserved. FEATURES Complete RF detector function Typical range: −45 dBm to 0 dBm, re 50 Ω Frequency response from 50 MHz to 3.5 GHz Temperature-stable linear-in-dB response Accurate to 3.5 GHz Rapid response: 85/120 ns (rise/fall) Low power: 12 mW at 2.7 V APPLICATIONS Cellular handsets (GSM, CDMA, WCDMA) RSSI and TSSI for wireless terminal devices Transmitter power measurement GENERAL DESCRIPTION The AD8312 is a complete, low cost subsystem for the measurement of RF signals in the frequency range of 50 MHz to 3.5 GHz. It has a typical dynamic range of 45 dB and is intended for use in a wide variety of cellular handsets and other wireless devices. It provides a wider dynamic range and better accuracy than possible using discrete diode detectors. In particular, its temperature stability is excellent over the full operating range of −40°C to +85°C. Its high sensitivity allows measurement at low power levels, thus reducing the amount of power that needs to be coupled to the detector. It is essentially a voltage-responding device, with a typical signal range of 1.25 mV to 224 mV rms or −45 dBm to 0 dBm, re 50 Ω. For convenience, the signal is internally ac-coupled, using a 5 pF capacitor to a load of 3 kΩ 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 10dB DET 10dB DET 10dB DET 10dB DET DET + – CFLT RFIN COMM OFFSET COMPENSATION V-I VSET BAND-GAP REFERENCE VPOS I-V VOUT AD8312 Figure 1. |
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