LF to 2.5 GHz
TruPwr™ Detector
AD8361
Data Sheet
FEATURES
FUNCTIONAL BLOCK DIAGRAMS
Calibrated rms response
Excellent temperature stability
VPOS
FLTR
INTERNAL FILTER
i
2
χ
RFIN
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
TRANS-
CONDUCTANCE
CELLS
AD8361
ERROR
AMP
i
2
× 7.5
BUFFER
χ
VRMS
ADD
OFFSET
BAND-GAP
REFERENCE
SREF
PWDN
COMM
APPLICATIONS
IREF
Measurement of CDMA, W-CDMA, QAM, other complex
modulation waveforms
RF transmitter or receiver power measurement
Figure 2. 8-Lead MSOP
VPOS
FLTR
INTERNAL FILTER
i
i
2
χ
RFIN
GENERAL DESCRIPTION
TRANS-
AD8361
CONDUCTANCE
CELLS
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.
ERROR
AMP
2
× 7.5
BUFFER
χ
VRMS
COMM
BAND-GAP
REFERENCE
PWDN
IREF
Figure 3. 6-Lead SOT-23
3.0
2.8
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.
SUPPLY
REFERENCE MODE
2.6
2.4
2.2
2.0
1.8
1.6
INTERNAL
REFERENCE MODE
The AD8361 has three operating modes to accommodate a
variety of analog-to-digital converter requirements:
1.4
1.2
1.0
0.8
0.6
GROUND
REFERENCE MODE
1. Ground reference mode, in which the origin is zero.
2. Internal reference mode, which offsets the output 350 mV
above ground.
0.4
0.2
0.0
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.
0
0.1
0.2
0.3
0.4
0.5
RFIN (V rms)
Figure 1. Output in the Three Reference Modes, Supply 3 V, Frequency 1.9 GHz
(6-Lead SOT-23 Package Ground Reference Mode Only)
Rev. F
Document Feedback
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responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rightsof third parties that may result fromits 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 andregisteredtrademarks 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 ©1999–2015 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com
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