Data Sheet
FEATURES
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
Sleep current: 250 µA
Pin compatible with
ADL5902
and
AD8363
10 MHz to 10 GHz
67 dB TruPwr Detector
ADL5906
FUNCTIONAL BLOCK DIAGRAM
VPOS1
3
VPOS2
10
ADL5906
TEMPERATURE
SENSOR
8
VTEMP
RFIN+
14
RFIN–
15
LINEAR-IN-dB VGA
(NEGATIVE SLOPE)
X
2
I
SQR
7
VSET
X
2
NIC
2
NIC
16
NIC
13
BIAS AND POWER
DOWN CONTROL
V
REF
2.3V
I
TGT
G=5
6
VRMS
APPLICATIONS
Power amplifier linearization/control loops
Transmitter signal strength indication (TSSI)
RF instrumentation
5
EPAD
1
11
12
9
CRMS
26pF
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.
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.
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.
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. A
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.
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4
ADL5906
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications ....................................................................................... 1
Functional Block Diagram .............................................................. 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Absolute Maximum Ratings............................................................ 7
ESD Caution .................................................................................. 7
Pin Configuration and Function Descriptions ............................. 8
Typical Performance Characteristics ............................................. 9
Theory of Operation ...................................................................... 16
Square Law Detector and Amplitude Target .............................. 16
RF Input Interface ...................................................................... 17
Temperature Sensor Interface ................................................... 17
VREF Interface ........................................................................... 17
Temperature Compensation Interface ..................................... 18
Power-Down Interface ............................................................... 19
Data Sheet
VSET Interface ............................................................................ 19
Output Interface ......................................................................... 19
VTGT Interface .......................................................................... 19
Basis for Error Calculations ...................................................... 20
Measurement Mode Basic Connections.................................. 20
Setting V
TADJ
................................................................................ 20
Setting V
TGT
................................................................................. 21
Choosing a Value for C
RMS
......................................................... 21
Output Voltage Scaling .............................................................. 22
System Calibration and Error Calculation.............................. 24
Using V
TEMP
to Improve Intercept Temperature Drift ........... 25
Description of Characterization ............................................... 27
Evaluation Board ............................................................................ 28
Evaluation Board Assembly Drawings .................................... 29
Outline Dimensions ....................................................................... 30
Ordering Guide .......................................................................... 30
REVISION HISTORY
10/13—Rev. 0 to Rev. A
Changes to Table 2 ............................................................................ 7
Changes to Ordering Guide .......................................................... 30
3/13—Revision 0: Initial Version
Rev. A | Page 2 of 32
Data Sheet
SPECIFICATIONS
ADL5906
VPOS1 = VPOS2 = 5 V, T
A
= 25°C, single-ended input drive, R
T
= 60.4 Ω, VRMS connected to VSET, V
TGT
= 0.8 V, C
RMS
= 0.1 µF. Negative
current values imply that the
ADL5906
is sourcing current out of the indicated pin.
Table 1.
Parameter
OVERALL FUNCTION
Frequency Range
RF INPUT INTERFACE
Input Impedance
Common-Mode Voltage
100 MHz
±1.0 dB Dynamic Range
Maximum Input Level, ±1.0 dB
Minimum Input Level, ±1.0 dB
Deviation vs. Temperature
Test Conditions/Comments
Min
Typ
10 to 10,000
RFIN+, Pin RFIN− (Pin 14, Pin 15), ac-coupled
Single-ended drive, 50 MHz
2500
2.5
62
2
−60
−0.8/+0.2
−0.8/+0.4
−1.3/+0.2
−1.2/+0.6
59
−64
62
2
−60
−0.9/+0.3
−0.9/+0.4
−1.5/+0.3
−1.3/+0.7
59
−65
63
3
−60
−0.8/+0.3
−0.9/+0.4
−1.4/+0.3
−1.4/+0.8
59
−65
−0.1
−0.2
0.05
−0.1
Max
Unit
MHz
Ω
V
dB
dBm
dBm
dB
dB
dB
dB
mV/dB
dBm
dB
dBm
dBm
dB
dB
dB
dB
mV/dB
dBm
dB
dBm
dBm
dB
dB
dB
dB
mV/dB
dBm
dB
dB
dB
dB
Logarithmic Slope
Logarithmic Intercept
700 MHz
±1.0 dB Dynamic Range
Maximum Input Level, ±1.0 dB
Minimum Input Level, ±1.0 dB
Deviation vs. Temperature
Continuous wave (CW) input, T
A
= 25°C
Calibration at −55 dBm, −40 dBm, and 0 dBm
Calibration at −55 dBm, −40 dBm, and 0 dBm
Deviation from output at 25°C, V
TADJ
= 0.35 V
−40°C < T
A
< +85°C; P
IN
= 0 dBm
−40°C < T
A
< +85°C; P
IN
= −45 dBm
−55°C < T
A
< +125°C; P
IN
= 0 dBm
−55°C < T
A
< +125°C; P
IN
= −45 dBm
−65 dBm < P
IN
< +10 dBm; calibration at −40 dBm and 0 dBm
−65 dBm < P
IN
< +10 dBm; calibration at −40 dBm and 0 dBm
CW input, T
A
= 25°C
Calibration at −55 dBm, −40 dBm, and 0 dBm
Calibration at −55 dBm, −40 dBm, and 0 dBm
Deviation from output at 25°C, V
TADJ
= 0.35 V
−40°C < T
A
< +85°C; P
IN
= 0 dBm
−40°C < T
A
< +85°C; P
IN
= −45 dBm
−55°C < T
A
< +125°C; P
IN
= 0 dBm
−55°C < T
A
< +125°C; P
IN
= −45 dBm
−65 dBm < P
IN
< +10 dBm; calibration at −40 dBm, and 0 dBm
−65 dBm < P
IN
< +10 dBm; calibration at −40 dBm and 0 dBm
CW input, T
A
= 25°C
Calibration at −55 dBm, −40 dBm, and 0 dBm
Calibration at −55 dBm, −40 dBm, and 0 dBm
Deviation from output at 25°C, V
TADJ
= 0.35 V
−40°C < T
A
< +85°C; P
IN
= 0 dBm
−40°C < T
A
< +85°C; P
IN
= −45 dBm
−55°C < T
A
< +125°C; P
IN
= 0 dBm
−55°C < T
A
< +125°C; P
IN
= −45 dBm
−65 dBm < P
IN
< +10 dBm; calibration at −40 dBm and 0 dBm
−65 dBm < P
IN
< +10 dBm; calibration at −40 dBm and 0 dBm
12.16 dB peak-to-rms ratio (four-carrier W-CDMA)
11.58 dB peak-to-rms ratio (LTE TM1, one-carrier, 20 MHz
bandwidth)
10.56 dB peak-to-rms ratio (W-CDMA)
7.4 dB peak-to-rms ratio (64 QAM)
Logarithmic Slope
Logarithmic Intercept
900 MHz
±1.0 dB Dynamic Range
Maximum Input Level, ±1.0 dB
Minimum Input Level, ±1.0 dB
Deviation vs. Temperature
Logarithmic Slope
Logarithmic Intercept
Deviation from CW Response
(−45 dBm to −5 dBm)
Rev. A | Page 3 of 32
ADL5906
Parameter
1900 MHz
±1.0 dB Dynamic Range
Maximum Input Level, ±1.0 dB
Minimum Input Level, ±1.0 dB
Deviation vs. Temperature
Test Conditions/Comments
CW input, T
A
= 25°C
Calibration at −55 dBm, −40 dBm, and 0 dBm
Calibration at −55 dBm, −40 dBm, and 0 dBm
Deviation from output at 25°C, V
TADJ
= 0.35 V
−40°C < T
A
< +85°C; P
IN
= 0 dBm
−40°C < T
A
< +85°C; P
IN
= −45 dBm
−55°C < T
A
< +125°C; P
IN
= 0 dBm
−55°C < T
A
< +125°C; P
IN
= −45 dBm
−65 dBm < P
IN
< +10 dBm; calibration at −40 dBm and 0 dBm
−65 dBm < P
IN
< +10 dBm; calibration at −40 dBm and 0 dBm
CW input, T
A
= 25°C
Calibration at −55 dBm, −40 dBm, and 0 dBm
Calibration at −55 dBm, −40 dBm, and 0 dBm
Deviation from output at 25°C, V
TADJ
= 0.35 V
−40°C < T
A
< +85°C; P
IN
= 0 dBm
−40°C < T
A
< +85°C; P
IN
= −45 dBm
−55°C < T
A
< +125°C; P
IN
= 0 dBm
−55°C < T
A
< +125°C; P
IN
= −45 dBm
−65 dBm < P
IN
< +10 dBm; calibration at −40 dBm and 0 dBm
−65 dBm < P
IN
< +10 dBm; calibration at −40 dBm and 0 dBm
12.16 dB peak-to-rms ratio (four-carrier W-CDMA)
11.58 dB peak-to-rms ratio (LTE TM1, one-carrier, 20 MHz
bandwidth)
10.56 dB peak-to-rms ratio (one-carrier W-CDMA)
7.4 dB peak-to-rms ratio (64 QAM)
2600 MHz
±1.0 dB Dynamic Range
Maximum Input Level, ±1.0 dB
Minimum Input Level, ±1.0 dB
Deviation vs. Temperature
CW input, T
A
= 25°C
Calibration at −55 dBm, −40 dBm, and 0 dBm
Calibration at −55 dBm, −40 dBm, and 0 dBm
Deviation from output at 25°C, V
TADJ
= 0.4 V
−40°C < T
A
< +85°C; P
IN
= 0 dBm
−40°C < T
A
< +85°C; P
IN
= −45 dBm
−55°C < T
A
< +125°C; P
IN
= 0 dBm
−55°C < T
A
< +125°C; P
IN
= −45 dBm
−65 dBm < P
IN
< +10 dBm; calibration at −40 dBm and 0 dBm
−65 dBm < P
IN
< +10 dBm; calibration at −40 dBm and 0 dBm
CW input, T
A
= 25°C
Calibration at −55 dBm, −40 dBm, and 0 dBm
Calibration at −55 dBm, −40 dBm, and 0 dBm
Deviation from output at 25°C, V
TADJ
= 0.45 V
−40°C < T
A
< +85°C; P
IN
= 0 dBm
−40°C < T
A
< +85°C; P
IN
= −45 dBm
−55°C < T
A
< +125°C; P
IN
= 0 dBm
−55°C < T
A
< +125°C; P
IN
= −45 dBm
−65 dBm < P
IN
< +10 dBm; calibration at −40 dBm and 0 dBm
−65 dBm < P
IN
< +10 dBm; calibration at −40 dBm and 0 dBm
Min
Typ
66
6
−60
−0.8/+0.2
−0.8/+0.5
−1.4/+0.2
−1.2/+0.9
57
−65
67
7
−60
−0.8/+0.3
−0.8/+0.6
−1.3/+0.3
−1.2/+0.9
56
−65
−0.1
0.1
0.1
−0.1
68
8
−60
−0.9/+0.3
−1/+0.5
−1.4/+0.3
−1.4/+0.8
55
−65
65
5
−60
−1.5/0
−1/+0.3
−1.5/0
−1.4/+0.4
52
−64
Data Sheet
Max
Unit
dB
dBm
dBm
dB
dB
dB
dB
mV/dB
dBm
dB
dBm
dBm
dB
dB
dB
dB
mV/dB
dBm
dB
dB
dB
dB
dB
dBm
dBm
dB
dB
dB
dB
mV/dB
dBm
dB
dBm
dBm
dB
dB
dB
dB
mV/dB
dBm
Logarithmic Slope
Logarithmic Intercept
2140 MHz
±1.0 dB Dynamic Range
Maximum Input Level, ±1.0 dB
Minimum Input Level, ±1.0 dB
Deviation vs. Temperature
Logarithmic Slope
Logarithmic Intercept
Deviation from CW Response
(−45 dBm to −5 dBm)
Logarithmic Slope
Logarithmic Intercept
3500 MHz
±1.0 dB Dynamic Range
Maximum Input Level, ±1.0 dB
Minimum Input Level, ±1.0 dB
Deviation vs. Temperature
Logarithmic Slope
Logarithmic Intercept
Rev. A | Page 4 of 32
Data Sheet
Parameter
5800 MHz
±1.0 dB Dynamic Range
Maximum Input Level, ±1.0 dB
Minimum Input Level, ±1.0 dB
Deviation vs. Temperature
Test Conditions/Comments
CW input, T
A
= 25°C
Calibration at −50 dBm, −40 dBm, and 0 dBm
Calibration at −50 dBm, −40 dBm, and 0 dBm
Deviation from output at 25°C, V
TADJ
= 1 V
−40°C < T
A
< +85°C; P
IN
= 0 dBm
−40°C < T
A
< +85°C; P
IN
= −45 dBm
−55°C < T
A
< +125°C; P
IN
= 0 dBm
−55°C < T
A
< +125°C; P
IN
= −45 dBm
−65 dBm < P
IN
< +10 dBm; calibration at −40 dBm and 0 dBm
−65 dBm < P
IN
< +10 dBm; calibration at −40 dBm and 0 dBm
VRMS (Pin 6)
Swing range minimum, R
L
≥ 500 Ω to ground
Swing range maximum, R
L
≥ 500 Ω to ground
P
IN
= off to −10 dBm, 10% to 90%, C
RMS
= 1 nF
P
IN
= −10 dBm to off, 90% to 10%, C
RMS
= 1 nF
VSET (Pin 7)
Log conformance error ≤ 1 dB, minimum 2.14 GHz
Log conformance error ≤ 1 dB, maximum 2.14 GHz
f = 2.14 GHz
f = 2.14 GHz
TADJ/PWDN (Pin 1)
0
V
TADJ
= 0.35 V
V
TADJ
= 0.35 V
VREF (Pin 11)
P
IN
= −55 dBm
25°C ≤ T
A
≤ 125°C
−55°C ≤ T
A
≤ +25°C
25°C ≤ T
A
≤ 125°C
−55°C ≤ T
A
≤ +25°C
T
A
= 25°C, I
LOAD
= 2 mA
VTEMP (Pin 8)
T
A
= 25°C, R
L
≥ 10 kΩ
−40°C ≤ T
A
≤ +125°C, R
L
≥ 10 kΩ
25°C ≤ T
A
≤ 125°C
−55°C ≤ T
A
≤ +25°C
T
A
= 25°C, I
LOAD
= 1 mA
VTGT (Pin 12)
0.2
V
TGT
= 0.8 V
VTADJ/PWDN (Pin 1)
V
PWDN
decreasing
V
PWDN
increasing
V
PWDN
= 5 V
V
PWDN
= 0 V
V
PWDN
low to V
RMS
, 10% to 90%, C
RMS
= 1 nF, P
IN
= 0 dBm
V
PWDN
high to V
RMS
, 90% to 10%, C
RMS
= 1 nF, P
IN
= 0 dBm
Rev. A | Page 5 of 32
ADL5906
Min
Typ
57
3
−54
−2.4/+0
−1.4/-0.2
−3.6/+0
−2.1/-0.2
42
−60
0.05
3.92
10/10
0.1
14.6
3.92
0.4
72
56
−65
V
POS
5
70
2.3
−0.12
0.07
4/0.05
3/0.05
−0.4
1.4
4.8
4/0.05
3/0.05
−2.8
2.5
8
100
1.3
1.4
72
0.1
1.4
1.0
Max
Unit
dB
dBm
dBm
dB
dB
dB
dB
mV/dB
dBm
V
V
mA
µs
µs
V
V
kΩ
mV/dB
dBm
V
µA
kΩ
V
mV/°C
mV/°C
mA
mA
%
V
mV/°C
mA
mA
%
V
µA
kΩ
V
V
µA
µA
µs
µs
Logarithmic Slope
Logarithmic Intercept
OUTPUT INTERFACE
Output Swing, Controller Mode
Current Source/Sink Capability
Rise Time
Fall Time
SETPOINT INPUT
Voltage Range
Input Resistance
Logarithmic Scale Factor
Logarithmic Intercept
TEMPERATURE COMPENSATION
Input Voltage Range
Input Bias Current
Input Resistance
VOLTAGE REFERENCE
Output Voltage
Temperature Sensitivity
Short-Circuit Current Source/
Sink Capability
Voltage Regulation
TEMPERATURE REFERENCE
Output Voltage
Temperature Coefficient
Short-Circuit Current Source/
Sink Capability
Voltage Regulation
RMS TARGET INTERFACE
Input Voltage Range
Input Bias Current
Input Resistance
POWER-DOWN INTERFACE
Voltage Level to Enable
Voltage Level to Disable
Input Bias Current
Enable Time
Disable Time
