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Analog Devices Semiconductor Electronic Components Datasheet

AD8314 Datasheet

RF Detector/Controller

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AD8314 pdf
100 MHz to 2.7 GHz, 45 dB
RF Detector/Controller
AD8314
FEATURES
Complete RF detector/controller function
Typical range:−58 dBV to −13 dBV
−45 dBm to 0 dBm, re 50 Ω
Frequency response from 100 MHz to 2.7 GHz
Temperature-stable linear-in-dB response
Accurate to 2.7 GHz
Rapid response: 70 ns to a 10 dB step
Low power: 12 mW at 2.7 V
Power down to 20 μA
APPLICATIONS
Cellular handsets (TDMA, CDMA , GSM)
RSSI and TSSI for wireless terminal devices
Transmitter power measurement and control
GENERAL DESCRIPTION
The AD8314 is a complete low cost subsystem for the
measurement and control of RF signals in the frequency range
of 100 MHz to 2.7 GHz, with a typical dynamic range of 45 dB,
intended for use in a wide variety of cellular handsets and other
wireless devices. It provides a wider dynamic range and better
accuracy than possible using discrete diode detectors. In
particular, its temperature stability is excellent over the full
operating range of −40°C to +85°C.
Its high sensitivity allows control at low power levels, thus
reducing the amount of power that needs to be coupled to the
detector. It is essentially a voltage-responding device, with a
typical signal range of 1.25 mV to 224 mV rms or –58 dBV to
−13 dBV. This is equivalent to −45 dBm to 0 dBm, re 50 Ω.
For convenience, the signal is internally ac-coupled, using a
5 pF capacitor to a load of 3 kΩ in shunt with 2 pF. This high-
pass coupling, with a corner at approximately 16 MHz,
determines the lowest operating frequency. Therefore, the
source can be dc grounded.
The AD8314 provides two voltage outputs. The first, V_UP,
increases from close to ground to about 1.2 V as the input signal
level increases from 1.25 mV to 224 mV. This output is intended
for use in measurement mode. Consult the Applications section
for information on this mode. A capacitor can be connected
between the V_UP and FLTR pins when it is desirable to
increase the time interval over which averaging of the input
waveform occurs.
The second output, V_DN, is an inversion of V_UP but with
twice the slope and offset by a fixed amount. This output starts
at about 2.25 V (provided the supply voltage is ≥3.3 V) for the
minimum input and falls to a value close to ground at the
maximum input. This output is intended for analog control
loop applications. A setpoint voltage is applied to VSET, and
V_DN is then used to control a VGA or power amplifier. Here
again, an external filter capacitor can be added to extend the
averaging time. Consult the Applications section for
information on this mode.
The AD8314 is available in 8-lead MSOP and 8-lead LFCSP
packages and consumes 4.5 mA from a 2.7 V to 5.5 V supply.
When powered down, the typical sleep current is 20 μA.
FUNCTIONAL BLOCK DIAGRAM
RFIN
FLTR
+
DET
DET
DET
DET
DET
10dB
10dB
10dB
10dB
+
V-I
I-V
X2
VSET
V_UP
V_DN
COMM
(PADDLE)
OFFSET
COMPENSATION
AD8314
Figure 1.
BAND GAP
REFERENCE
VPOS
ENBL
Rev. B
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.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
©2006 Analog Devices, Inc. All rights reserved.


Analog Devices Semiconductor Electronic Components Datasheet

AD8314 Datasheet

RF Detector/Controller

No Preview Available !

AD8314 pdf
AD8314* Product Page Quick Links
Last Content Update: 11/01/2016
Comparable Parts
View a parametric search of comparable parts
Evaluation Kits
• AD8314 Evaluation Board
Documentation
Application Notes
• AN-1040: RF Power Calibration Improves Performance of
Wireless Transmitters
• AN-653: Improving Temperature, Stability, and Linearity
of High Dynamic Range RMS RF Power Detectors
Data Sheet
• AD8314: 100 MHz to 2.7 GHz, 45 dB RF Detector/
Controller Data Sheet
Product Highlight
• Industrial Applications
Tools and Simulations
• ADIsimPLL™
• ADIsimRF
Reference Materials
Product Selection Guide
• RF Source Booklet
Technical Articles
• Design a Logamp RF Pulse Detector
• Detecting Fast RF Bursts using Log Amps
• Log Amps and Directional Couplers Enable VSWR
Detection
• Make Precise Base-Station Power Measurements
• Measurement and Control of RF Power, Part I
• Measurement and Control of RF Power, Part II
• Measurement and Control of RF Power, Part III
• Measuring the RF Power in CDMA2000 and W-CDMA
High Power Amplifiers (HPAs)
• Measuring VSWR and Gain in Wireless Systems
Tutorials
• Design and Operation of Automatic Gain Control Loops for
Receivers in Modern Communication Systems
Design Resources
• AD8314 Material Declaration
• PCN-PDN Information
• Quality And Reliability
• Symbols and Footprints
Discussions
View all AD8314 EngineerZone Discussions
Sample and Buy
Visit the product page to see pricing options
Technical Support
Submit a technical question or find your regional support
number
* This page was dynamically generated by Analog Devices, Inc. and inserted into this data sheet. Note: Dynamic changes to
the content on this page does not constitute a change to the revision number of the product data sheet. This content may be
frequently modified.


Part Number AD8314
Description RF Detector/Controller
Maker Analog Devices
Total Page 21 Pages
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