AD8361ARM Analog Devices Inc, AD8361ARM Datasheet

IC PWR DETECTOR 2.5GHZ 8-MSOP

AD8361ARM

Manufacturer Part Number
AD8361ARM
Description
IC PWR DETECTOR 2.5GHZ 8-MSOP
Manufacturer
Analog Devices Inc
Datasheet

Specifications of AD8361ARM

Rf Type
Cellular, CDMA, W-CDMA
Rohs Status
RoHS non-compliant
Frequency
100MHz ~ 2.5GHz
Input Range
0 ~ 700mV
Accuracy
±0.25dB
Voltage - Supply
2.7 V ~ 5.5 V
Current - Supply
1.1mA
Package / Case
8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
Frequency Range
100MHz To 2.5GHz
Supply Current
1.1mA
Supply Voltage Range
2.7V To 5.5V
Rf Ic Case Style
MSOP
No. Of Pins
8
Operating Temperature Range
-40°C To +85°C
Pin Count
8
Screening Level
Industrial
Package Type
MSOP
Lead Free Status / Rohs Status
Not Compliant

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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
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.
Figure 1. Output in the Three Reference Modes, Supply 3 V, Frequency 1.9 GHz
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.
modulation waveforms
3.0
2.8
2.6
2.4
2.2
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
0
(6-Lead SOT-23 Package Ground Reference Mode Only)
REFERENCE MODE
REFERENCE MODE
INTERNAL
0.1
SUPPLY
0.2
RFIN (V rms)
REFERENCE MODE
0.3
GROUND
0.4
0.5
PWDN
PWDN
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.
2.
3.
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 f
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.326.8703
RFIN
RFIN
Ground reference mode, in which the origin is zero.
Internal reference mode, which offsets the output 350 mV
above ground.
Supply reference mode, which offsets the output to V
TRANS-
CONDUCTANCE
CELLS
TRANS-
CONDUCTANCE
CELLS
FUNCTIONAL BLOCK DIAGRAMS
χ
χ
χ
χ
2
2
2
2
REFERENCE
REFERENCE
BAND-GAP
BAND-GAP
© 2004 Analog Devices, Inc. All rights reserved.
i
i
i
i
Figure 3. 6-Lead SOT-23
Figure 2. 8-Lead MSOP
TruPwr™ Detector
ERROR
AMP
ERROR
AMP
T
silicon bipolar process.
LF to 2.5 GHz
IREF
IREF
INTERNAL FILTER
INTERNAL FILTER
AD8361
AD8361
× 7.5
BUFFER
× 7.5
BUFFER
www.analog.com
OFFSET
AD8361
ADD
FLTR
FLTR
VRMS
SREF
COMM
VRMS
COMM
VPOS
VPOS
S
/7.5.

AD8361ARM Summary of contents

Page 1

FEATURES Calibrated rms response Excellent temperature stability input range at 2.5 GHz 700 mV rms, 10 dBm Ω maximum input ±0.25 dB linear response up to 2.5 GHz Single-supply operation: 2 5.5 ...

Page 2

AD8361 TABLE OF CONTENTS Specifications..................................................................................... 3 Absolute Maximum Ratings............................................................ 4 ESD Caution.................................................................................. 4 Pin Configuration and Function Descriptions............................. 5 Typical Performance Characteristics ............................................. 6 Circuit Description......................................................................... 11 REVISION HISTORY 8/04—Data Sheet Changed from Rev Rev. C. Changed Trimpots ...

Page 3

SPECIFICATIONS T = 25° 900 MHz, ground reference output mode, unless otherwise noted Table 1. Parameter SIGNAL INPUT INTERFACE 1 Frequency Range Linear Response Upper Limit 2 Input Impedance RMS CONVERSION ...

Page 4

AD8361 ABSOLUTE MAXIMUM RATINGS Table 2. Parameter Rating Supply Voltage V 5 SREF, PWDN IREF V − 0 RFIN 1 V rms Equivalent Power Ω 13 dBm 1 Internal Power ...

Page 5

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS VPOS 1 8 AD8361 IREF 2 7 TOP VIEW RFIN 3 6 (Not to Scale) PWDN 4 5 Figure 4. 8-Lead MSOP Table 3. Pin Function Descriptions Pin No. Pin No. MSOP SOT-23 Mnemonic Description ...

Page 6

AD8361 TYPICAL PERFORMANCE CHARACTERISTICS 2.8 900MHz 2.6 2.4 2.2 100MHz 2.0 1.8 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0.0 0 0.1 0.2 0.3 INPUT (V rms) Figure 6. Output vs. Input Level, Frequencies 100 MHz, 900 MHz, 1900 ...

Page 7

MEAN ±3 SIGMA –1.5 –2.0 2.5 –3.0 0.01 0.02 0.1 (–21dBm) (–7dBm) INPUT (V rms) Figure 12. Error from CW Linear Reference vs. Input, 3 Sigma to Either Side of Mean, ...

Page 8

AD8361 0.03 0.02 0.01 0.00 –0.01 –0.02 MEAN ±3 SIGMA –0.03 –0.04 –0.05 –40 – TEMPERATURE (°C) Figure 18. Output Reference Change vs. Temperature, Supply 3 V, Ground Reference Mode 0.02 0.01 0.00 –0.01 MEAN ±3 SIGMA ...

Page 9

GATE PULSE FOR 900MHz RF TONE 370mV 270mV RF INPUT 67mV 25mV 5µs PER HORIZONTAL DIVISION Figure 24. Output Response to Modulated Pulse Input for Various RF Input Levels, Supply 3 V, Modulation Frequency 900 MHz, No Filter Capacitor GATE ...

Page 10

AD8361 7.8 7 7.4 S 7.2 7.0 6.8 6.6 6.4 6.2 6.0 5.8 5.6 100 CARRIER FREQUENCY (MHz) Figure 30. Conversion Gain Change vs. Frequency, Supply 3 V, Ground Reference Mode, Frequency 100 MHz to 2500 MHz, ...

Page 11

CIRCUIT DESCRIPTION The AD8361 is an rms-responding (mean power) detector that provides an approach to the exact measurement of RF power that is basically independent of waveform. It achieves this function through the use of a proprietary technique in which ...

Page 12

AD8361 APPLICATIONS Basic Connections Figure 36 through Figure 38 show the basic connections for the AD8361’s MSOP version in its three operating modes. In all modes, the device is powered by a single supply of between 2.7 V and 5.5 ...

Page 13

INPUT (V rms) Figure 40. Output Swing for Supply Voltages of 2.7 V, 3.0 V, 5.0 V and 5.5 V (MSOP Only) ...

Page 14

AD8361 C C RFIN R SH Figure 43. Input Coupling/Matching Options, Broadband Resistor Match RFIN Figure 44. Input Coupling/Matching Options, Series Inductor Match RFIN L M Figure 45. Input Coupling/Matching Options, Narrowband ...

Page 15

The filter capacitance of the AD8361 can be augmented by connecting a capacitor between Pin 6 (FLTR) and VPOS. Table 7 shows the effect of several capacitor values for various communications standards with high peak-to-average ratios along with the residual ...

Page 16

AD8361 Output Drive Capability and Buffering The AD8361 is capable of sourcing an output current of approximately 3 mA. If additional current is required, a simple buffering circuit can be used as shown in Figure 51. Similar circuits can be ...

Page 17

The equation can be rewritten to yield a temperature compensated value for − − × DRIFT TEMP = OS VOS OUT V IN GAIN Figure 52 shows the output voltage and error (in ...

Page 18

AD8361 2.5 2.0 +80°C 1.5 +25°C 1.0 –30°C 0.5 0 –0.5 –1.0 –1.5 –2.0 –2.5 –25 –20 –15 –10 –5 PIN (dBm) Figure 55. Transfer Function and Error Plots Measured at 2.5 GHz for a 64 QAM Modulated Signal 2.5 ...

Page 19

GHz. However necessary to calibrate for a given application to accommodate for the change in conversion gain at higher frequencies. Dynamic Range Extension for the AD8361 The accurate measurement range of the AD8361 is limited by internal ...

Page 20

AD8361 U6 provides feedback to linearize the inherent tanh transfer function of the OTAs. When one OTA or the other is fully selected, the feedback is very effective. The active OTA has zero differential input; the inactive one has a ...

Page 21

EVALUATION BOARD Figure 65 and Figure 68 show the schematic of the AD8361 evaluation board. Note that uninstalled components are drawn in as dashed. The layout and silkscreen of the component side are shown in Figure 66, Figure 67, Figure ...

Page 22

AD8361 VPOS TP2 0.01µF 100pF 0Ω SW3 V S AD8361 SW2 VPOS SREF IREF VRMS 2 7 100pF C5 RFIN 3 RFIN FLTR 6 R2 1nF 75Ω COMM 4 PWDN 5 VPOS ...

Page 23

Problems caused by impedance mismatch may arise using the evaluation board to examine the AD8361 performance. One way to reduce these problems is to put a coaxial 3 dB attenuator on the RFIN SMA connector. Mismatches at the source, cable, ...

Page 24

... AD8361ARM −40°C to +85°C AD8361ARM-REEL −40°C to +85°C AD8361ARM-REEL7 −40°C to +85°C 1 AD8361ARMZ −40°C to +85°C 1 AD8361ARMZ-REEL −40°C to +85°C 1 AD8361ARMZ-REEL7 −40°C to +85°C AD8361ART-REEL −40°C to +85°C AD8361ART-REEL7 −40°C to +85°C AD8361ARTZ-RL7 1 − ...

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