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PDF AD8361 Data sheet ( Hoja de datos )
| Número de pieza | AD8361 | |
| Descripción | LF to 2.5 GHz TruPwr Detector | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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Data Sheet
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
modulation waveforms
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.
3.0
2.8 SUPPLY
2.6 REFERENCE MODE
2.4
2.2
INTERNAL
2.0 REFERENCE MODE
1.8
1.6
1.4
1.2 GROUND
REFERENCE MODE
1.0
0.8
0.6
0.4
0.2
0.0
0
0.1 0.2 0.3 0.4
RFIN (V rms)
0.5
Figure 1. Output in the Three Reference Modes, Supply 3 V, Frequency 1.9 GHz
(6-Lead SOT-23 Package Ground Reference Mode Only)
LF to 2.5 GHz
TruPwr™ Detector
AD8361
FUNCTIONAL BLOCK DIAGRAMS
RFIN
PWDN
χ2 i
TRANS-
CONDUCTANCE
CELLS
χ2 i
INTERNAL FILTER
ERROR
AMP
AD8361
× 7.5
BUFFER
VPOS
FLTR
VRMS
BAND-GAP
REFERENCE
ADD
OFFSET
SREF
COMM
IREF
Figure 2. 8-Lead MSOP
RFIN
χ2 i
TRANS-
CONDUCTANCE
CELLS
χ2 i
INTERNAL FILTER
ERROR
AMP
AD8361
× 7.5
BUFFER
VPOS
FLTR
VRMS
PWDN
BAND-GAP
REFERENCE
COMM
IREF
Figure 3. 6-Lead SOT-23
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. Ground reference mode, in which the origin is zero.
2. Internal reference mode, which offsets the output 350 mV
above ground.
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.
Rev. F
Document Feedback
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityisassumedbyAnalogDevices for itsuse,nor foranyinfringementsofpatentsor 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.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
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
1 page  
AD8361
ABSOLUTE MAXIMUM RATINGS
Table 2.
Parameter
Supply Voltage VS
SREF, PWDN
IREF
RFIN
Equivalent Power, re 50 Ω
Internal Power Dissipation1
6-Lead SOT-23
8-Lead MSOP
Maximum Junction Temperature
Operating Temperature Range
Storage Temperature Range
Lead Temperature Range
(Soldering 60 sec)
Rating
5.5 V
0 V, VS
VS − 0.3 V, VS
1 V rms
13 dBm
200 mW
170 mW
200 mW
125°C
−40°C to +85°C
−65°C to +150°C
300°C
1 Specification is for the device in free air.
6-Lead SOT-23: θJA = 230°C/W; θJC = 92°C/W.
8-Lead MSOP: θJA = 200°C/W; θJC = 44°C/W.
Data Sheet
Stresses at or above those listed under Absolute Maximum
Ratings may cause permanent damage to the product. This is a
stress rating only; functional operation of the product at these
or any other conditions above those indicated in the
operational section of this specification is not implied.
Operation beyond the maximum operating conditions for
extended periods may affect product reliability.
ESD CAUTION
Rev. F | Page 4 of 22
5 Page 
AD8361
7.8
7.6
7.4
7.2
7.0
6.8
6.6
6.4
6.2
6.0
5.8
5.6
100
VS = 3V
1000
CARRIER FREQUENCY (MHz)
Figure 30. Conversion Gain Change vs. Frequency, Supply 3 V, Ground
Reference Mode, Frequency 100 MHz to 2500 MHz, Representative Device
SUPPLY
RF
INPUT
370mV
500mV PER
VERTICAL
DIVISION
270mV
67mV
25mV
20µs PER HORIZONTAL DIVISION
Figure 31. Output Response to Gating on Power Supply, for Various RF Input
Levels, Supply 3 V, Modulation Frequency 900 MHz, 0.01 µF Filter Capacitor
AD811
HP8110A
PULSE
50Ω GENERATOR
732Ω
TEK TDS784C
SCOPE
C4 C2
0.01µF 100pF
AD8361
1 VPOS SREF 8
R1
75Ω
2 IREF
C1
3 RFIN
0.1µF
4 PWDN
VRMS 7
FLTR 6
COMM 5
C3
TEK P6204
FET PROBE
C5
100pF
HP8648B
SIGNAL
GENERATOR
Figure 32. Hardware Configuration for Output Response to Power Supply
Gating Measurements
Data Sheet
16
14
12
10
8
6
4
2
0
6.9
7.0 7.2 7.4 7.6
CONVERSION GAIN (V/V rms)
7.8
Figure 33. Conversion Gain Distribution Frequency 100 MHz,
Supply 5 V, Sample Size 3000
12
10
8
6
4
2
0
0.32
0.34 0.36 0.38 0.40 0.42
IREF MODE INTERCEPT (V)
0.44
Figure 34. Output Reference, Internal Reference Mode, Supply 5 V,
Sample Size 3000 (MSOP Only)
12
10
8
6
4
2
0
0.64
0.66 0.68 0.70 0.72 0.74
SREF MODE INTERCEPT (V)
0.76
Figure 35. Output Reference, Supply Reference Mode, Supply 5 V,
Sample Size 3000 (MSOP Only)
Rev. F | Page 10 of 22
11 Page | ||
| Páginas | Total 23 Páginas | |
| PDF Descargar | [ Datasheet AD8361.PDF ] | |
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