AD8314ACPZ-REEL datasheet, PDF

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AD8314ACPZ-REEL: Description100 mhz to 2.7 ghz, 45 dB RF detector/controller; File Size396KB，20 Pages; ManufacturerADI; Websitehttps://www.analog.com

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100 mhz to 2.7 ghz, 45 dB RF detector/controller

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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

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.

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.

FUNCTIONAL BLOCK DIAGRAM

FLTR

–

DET

–

RFIN

10dB

V_DN

I-V

V_UP

V-I

VSET

OFFSET

COMPENSATION

COMM

(PADDLE)

AD8314

BAND GAP

REFERENCE

VPOS

ENBL

01086-001

Figure 1.

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.

Trademarks and registered trademarks are the property of their respective owners.

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

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

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

REVISION HISTORY

5/06—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

3/02—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

Rev. B | Page 2 of 20

AD8314ACPZ-REEL Related Products

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