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AD8361ARMZ-REEL7 Datasheet(PDF) 1 Page - Analog Devices

Part # AD8361ARMZ-REEL7
Description  LF to 2.5 GHz TruPwr Detector
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD8361ARMZ-REEL7 Datasheet(HTML) 1 Page - Analog Devices

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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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