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Analog Devices Semiconductor Electronic Components Datasheet

AD8314 Datasheet

RF Detector/Controller

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Data Sheet
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.
RFIN
COMM
(PADDLE)
FUNCTIONAL BLOCK DIAGRAM
FLTR
+
V-I
I-V
DET
DET
DET
DET
DET
10dB
10dB
10dB
10dB
X2
+
VSET
V_UP
V_DN
OFFSET
COMPENSATION
AD8314
BAND GAP
REFERENCE
VPOS
ENBL
Figure 1.
Rev. C
Document Feedback
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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 ©2002–2018 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com


Analog Devices Semiconductor Electronic Components Datasheet

AD8314 Datasheet

RF Detector/Controller

No Preview Available !

AD8314
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
General Description ......................................................................... 1
Functional Block Diagram .............................................................. 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Absolute Maximum Ratings............................................................ 4
ESD Caution.................................................................................. 4
Pin Configurations and Function Descriptions ........................... 5
Typical Performance Characteristics ............................................. 6
Theory of Operation ...................................................................... 10
Inverted Output .......................................................................... 11
Applications..................................................................................... 12
Basic Connections ...................................................................... 12
REVISION HISTORY
1/2018—Rev. B to Rev. C
Changes to Figure 3.......................................................................... 5
Added EPAD to Table 3 ................................................................... 5
Updated Outline Dimensions ....................................................... 20
Changes to Ordering Guide .......................................................... 21
5/2006—Rev. A to Rev. B
Updated Format..................................................................Universal
Changes to General Description .................................................... 1
Changes to Table 1............................................................................ 3
Changes to Table 2............................................................................ 4
Inserted Figure 3; Renumbered Sequentially................................ 5
Changes to Figure 4, Figure 5, Figure 6, Figure 7,
and Figure 8 ...................................................................................... 6
Changes to Figure 9, Figure 10, and Figure 12 ............................. 7
Changes to Figure 37...................................................................... 14
Changes to Table 5.......................................................................... 15
Changes to Figure 39...................................................................... 16
Changes to Table 7.......................................................................... 19
Updated Outline Dimensions ....................................................... 20
Changes to Ordering Guide .......................................................... 20
Data Sheet
Transfer Function in Terms of Slope and Intercept............... 12
dBV vs. dBm ............................................................................... 13
Filter Capacitor ........................................................................... 13
Operating in Controller Mode ................................................. 13
Power-On and Enable Glitch .................................................... 14
Input Coupling Options ............................................................ 14
Increasing the Logarithmic Slope in Measurement Mode ... 15
Effect of Waveform Type on Intercept .................................... 15
Mobile Handset Power Control Examples.............................. 16
Operation at 2.7 GHz................................................................. 18
Using the LFCSP Package.......................................................... 18
Evaluation Board ........................................................................ 18
Outline Dimensions ....................................................................... 20
Ordering Guide .......................................................................... 20
3/2002—Rev. 0 to Rev. A
Edit to Product Description.............................................................1
Edit to Specifications.........................................................................2
Edit to Ordering Guide ....................................................................3
Edit to TPC 1......................................................................................4
New Section (Operation at 2.7 GHz) Added.............................. 14
Addition of New Figures 14 and 15 ............................................. 14
Changes to Evaluation Board Section.......................................... 14
Addition of Chip Scale Package.................................................... 16
10/1999—Revision 0: Initial Version
Rev. C | Page 2 of 20


Part Number AD8314
Description RF Detector/Controller
Maker Analog Devices
Total Page 20 Pages
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