450 MHz to 6000 MHz
TruPwr Detector
ADL5505
FEATURES
FUNCTIONAL BLOCK DIAGRAM
VPOS
True rms response detector
Excellent temperature stability
ADL5505
INTERNAL
FILTERING
0.2ꢀ dB rms detection accuracy vs. temperature
Over 3ꢀ dB input power dynamic range, inclusive of crest factor
RF bandwidths from 4ꢀ0 MHz to 6000 MHz
ꢀ00 Ω input impedance
100Ω
RFIN
RMS CORE
VRMS
BUFFER
Single-supply operation: 2.ꢀ V to 3.3 V
Low power: 1.8 mA at 3.0 V supply
RoHS-compliant part
COMM
Figure 1.
APPLICATIONS
10
Power measurement of W-CDMA, CDMA2000, QPSK-/QAM-
based OFDM (LTE and WiMAX), and other complex
modulation waveforms
RF transmitter or receiver power measurement
1
0.1
0.01
–25
–20
–15
–10
–5
0
5
10
15
INPUT (dBm)
Figure 2. Output vs. Input Level, Supply = 3.0 V, Frequency = 1900 MHz
GENERAL DESCRIPTION
The ADL5505 is a TruPwr™ mean-responding (true rms) power
detector for use in high frequency receiver and transmitter signal
chains from 450 MHz to 6000 MHz. Requiring only a single
supply between 2.5 V and 3.3 V, the detector draws less than
1.8 mA. The input is internally ac-coupled and has a nominal
input impedance of 500 Ω. The rms output is a linear-responding
dc voltage with a conversion gain of 1.86 V/V rms at 900 MHz.
The on-chip modulation filter provides adequate averaging for
most waveforms. An 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.
The ADL5505 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 ADL5505 offers low process variations
that further reduce calibration complexity.
The ADL5505 is a highly accurate, easy to use means of
determining the rms of complex waveforms. It can be used for
power measurements of both simple and complex waveforms
but is particularly useful for measuring high crest factor (high
peak-to-rms ratio) signals, such as W-CDMA, CDMA2000,
WiMAX, WLAN, and LTE waveforms.
The power detector operates from −40°C to +85°C and is
available in an 4-ball, 0.8 mm × 0.8 mm wafer-level chip scale
package. It is fabricated on a high fT silicon BiCMOS process.
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 registeredtrademarks arethe property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
www.analog.com
©2010 Analog Devices, Inc. All rights reserved.
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