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ADL5501 Folha de dados(PDF) 1 Page - Analog Devices

Nome de Peças ADL5501
Descrição Electrónicos  50 MHz to 4 GHz TruPwr Detector
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Fabricante Electrônico  AD [Analog Devices]
Página de início  http://www.analog.com
Logo AD - Analog Devices

ADL5501 Folha de dados(HTML) 1 Page - Analog Devices

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50 MHz to 4 GHz
TruPwrDetector
ADL5501
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringements of patents or other
rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
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
©2006 Analog Devices, Inc. All rights reserved.
FEATURES
True rms response
Excellent temperature stability
Up to 30 dB input dynamic range at 4 GHz
50 Ω input impedance
1.25 V rms, 15 dBm, maximum input
Single-supply operation: 2.7 V to 5.5 V
Low power: 3.3 mW at 3 V supply
RoHS-compliant
APPLICATIONS
Measurement of CDMA2000-, W-CDMA-, and QPSK-/QAM-
based OFDM, and other complex modulation waveforms
RF transmitter or receiver power measurement
5
0.03
0.1
1
–25
–20
–15
–10
–5
0
5
10
15
INPUT (dBm)
Figure 1. Output vs. Input Level, Supply 3 V, Frequency 1.9 GHz
GENERAL DESCRIPTION
The ADL5501 is a mean-responding power detector for use
in high frequency receiver and transmitter signal chains from
50 MHz to 4 GHz. It is easy to apply, requiring only a single
supply between 2.7 V and 5.5 V and a power supply decoupling
capacitor. The input is internally ac-coupled and has a nominal
input impedance of 50 Ω. The output is a linear-responding dc
voltage with a conversion gain of 6.3 V/V rms at 900 MHz.
The ADL5501 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-, CDMA2000-, W-CDMA-, and QPSK-/QAM-
based OFDM waveforms. The on-chip modulation filter provides
adequate averaging for most waveforms.
The on-chip, 100 Ω series resistance at the output, combined
with an external shunt capacitor, creates a low-pass filter response
that reduces the residual ripple in the dc output voltage. For more
complex waveforms, an external capacitor at the FLTR pin can
be used for supplementary signal demodulation.
The ADL5501 offers excellent temperature stability across a
30 dB range and near 0 dB measurement error across temperature
over the top portion of the dynamic range. In addition to its
temperature stability, the ADL5501 offers low process variations
that further reduce calibration complexity.
The ADL5501 operates from −40°C to +85°C and is available in
a small 6-lead SC-70 package. It is fabricated on a proprietary
high fT silicon bipolar process.
FUNCTIONAL BLOCK DIAGRAM
RFIN
BUFFER
VPOS
VRMS
COMM
ERROR
AMP
x2
x2
i
i
TRANS-
CONDICTANCE
CELLS
ADL5501
100Ω
FLTR
BAND-GAP
REFERENCE
ENBL
INTERNAL FILTER
CAPACITOR
Figure 2.


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