10 MHz to 10 GHz
67 dB TruPwr Detector
Data Sheet
ADL5906
FEATURES
FUNCTIONAL BLOCK DIAGRAM
VPOS1
3
V
POS2
10
Accurate rms-to-dc conversion from 10 MHz to 10 GHz
Single-ended 1.0 dB dynamic range: 67 dB at 2.14 GHz
No balun or external input matching required
Response independent of waveform types, such as
GSM-EDGE/CDMA/W-CDMA/TD-SCDMA/WiMAX/LTE
Logarithmic slope: 55 mV/dB
Temperature stability: < 1 dB from −40°C to +125°C
Operating temperature: −55°C to +125°C
Supply voltage: 4.75 V to 5.25 V
TEMPERATURE
SENSOR
8
VTEMP
ADL5906
I
14
15
SQR
RFIN+
RFIN–
2
X
7
6
VSET
LINEAR-IN-dB VGA
(NEGATIVE SLOPE)
2
X
I
TGT
2
VRMS
NIC
NIC
NIC
G = 5
Sleep current: 250 µA
Pin compatible with ADL5902 and AD8363
16
V
2.3V
BIAS AND POWER
DOWN CONTROL
REF
13
5
CRMS
EPAD
26pF
APPLICATIONS
11
12
1
9
4
Power amplifier linearization/control loops
Transmitter signal strength indication (TSSI)
RF instrumentation
TADJ/
PWDN
VREF VTGT GND2
GND1
Figure 1.
GENERAL DESCRIPTION
The ADL5906 is a true rms responding power detector that has a
67 dB measurement range when driven with a single-ended 50 Ω
source. The easy to use input makes the ADL5906 frequency
versatile by eliminating the need for a balun or any other form
of external input tuning for operation up to 10 GHz.
Used as a power measurement device, VRMS is connected to
VSET. The output is then proportional to the logarithm of the
rms value of the input. In other words, the reading is presented
directly in decibels and is scaled 1.1 V per decade, or 55 mV/dB;
other slopes are easily arranged. In controller mode, the voltage
applied to VSET determines the power level required at the
input to null the deviation from the setpoint. The output buffer
can provide high load currents.
The ADL5906 provides a solution in a variety of high frequency
systems requiring an accurate rms measurement of signal power.
The ADL5906 can operate from 10 MHz to 10 GHz and can
accept inputs from −65 dBm to +8 dBm with varying crest factors
and bandwidths, such as GSM-EDGE, CDMA, W-CDMA,
TD-SCDMA, WiMAX, and OFDM-based LTE carriers. In
addition, its temperature stability over the broad temperature
range of −55°C to +125°C makes it ideally suited for a wide array
of communications, military, industrial, and instrumentation
applications.
Requiring only a single supply of 5 V and a few capacitors, it is
easy to use and capable of being driven single-ended or with a
balun for differential input drive. The ADL5906 has a low 250 µA
sleep current when powered down by a logic high applied to the
PWDN pin. It powers up within approximately 1.4 µs to its
nominal operating current of 68 mA at 25°C.
The ADL5906 is supplied in a 4 mm × 4 mm, 16-lead LFCSP, and
it is pin compatible with the ADL5902 and the AD8363 TruPwr™
rms detectors. This feature allows the designer to create one circuit
layout for projects requiring different dynamic ranges. A fully
populated RoHS-compliant evaluation board is available.
Rev. 0
Document Feedback
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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
Technical Support
©2013 Analog Devices, Inc. All rights reserved.
www.analog.com
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