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AD8361ARTZ-RL7 Datasheet(PDF) 1 Page - Analog Devices |
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AD8361ARTZ-RL7 Datasheet(HTML) 1 Page - Analog Devices |
1 / 24 page LF to 2.5 GHz TruPwr™ Detector AD8361 Rev. C 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: 781.326.8703 © 2004 Analog Devices, Inc. All rights reserved. FEATURES Calibrated rms response Excellent temperature stability Up to 30 dB input range at 2.5 GHz 700 mV rms, 10 dBm, re 50 Ω maximum input ±0.25 dB linear response up to 2.5 GHz Single-supply operation: 2.7 V to 5.5 V Low power: 3.3 mW at 3 V supply Rapid power-down to less than 1 µA APPLICATIONS Measurement of CDMA, W-CDMA, QAM, other complex modulation waveforms RF transmitter or receiver power measurement GENERAL DESCRIPTION The AD8361 is a mean-responding power detector for use in high frequency receiver and transmitter signal chains, up to 2.5 GHz. It is very easy to apply. It requires a single supply only between 2.7 V and 5.5 V, a power supply decoupling capacitor, and an input coupling capacitor in most applications. The output is a linear-responding dc voltage with a conversion gain of 7.5 V/V rms. An external filter capacitor can be added to increase the averaging time constant. RFIN (V rms) 3.0 1.6 0 0.5 0.1 0.2 0.3 0.4 2.6 2.2 2.0 1.8 2.8 2.4 1.4 1.2 1.0 0.6 0.8 0.4 0.2 0.0 SUPPLY REFERENCE MODE INTERNAL REFERENCE MODE GROUND REFERENCE MODE Figure 1. Output in the Three Reference Modes, Supply 3 V, Frequency 1.9 GHz (6-Lead SOT-23 Package Ground Reference Mode Only) FUNCTIONAL BLOCK DIAGRAMS RFIN IREF PWDN VPOS FLTR SREF VRMS COMM BAND-GAP REFERENCE ERROR AMP AD8361 INTERNAL FILTER ADD OFFSET TRANS- CONDUCTANCE CELLS i i × 7.5 BUFFER χ2 χ2 Figure 2. 8-Lead MSOP RFIN IREF PWDN VPOS FLTR VRMS COMM BAND-GAP REFERENCE ERROR AMP AD8361 INTERNAL FILTER TRANS- CONDUCTANCE CELLS i i × 7.5 BUFFER χ2 χ2 Figure 3. 6-Lead SOT-23 The AD8361 is intended for true power measurement of simple and complex waveforms. The device is particularly useful for measuring high crest-factor (high peak-to-rms ratio) signals, such as CDMA and W-CDMA. The AD8361 has three operating modes to accommodate a variety of analog-to-digital converter requirements: 1. Ground reference mode, in which the origin is zero. 2. Internal reference mode, which offsets the output 350 mV above ground. 3. Supply reference mode, which offsets the output to VS/7.5. The AD8361 is specified for operation from −40°C to +85°C and is available in 8-lead MSOP and 6-lead SOT-23 packages. It is fabricated on a proprietary high fT silicon bipolar process. |
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