AD8314ACPZ-REEL Analog Devices Inc, AD8314ACPZ-REEL Datasheet

AD8314ACPZ-REEL

Manufacturer Part Number

AD8314ACPZ-REEL

Description

Manufacturer

Analog Devices Inc

Datasheet

1.AD8314ACPZ-REEL.pdf (20 pages)

Specifications of AD8314ACPZ-REEL

Operating Temperature (min)

-40C

Operating Temperature (max)

85C

Operating Temperature Classification

Industrial

Mounting

Surface Mount

Pin Count

Lead Free Status / RoHS Status

Compliant

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FEATURES

Complete RF detector/controller function

Typical range:−58 dBV to −13 dBV

Frequency response from 100 MHz to 2.7 GHz

Temperature-stable linear-in-dB response

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.

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.

−45 dBm to 0 dBm, re 50 Ω

Accurate to 2.7 GHz

(PADDLE)

COMM

RFIN

DET

COMPENSATION

10dB

OFFSET

FUNCTIONAL BLOCK DIAGRAM

DET

10dB

DET

Figure 1.

10dB

AD8314

DET

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781.329.4700

Fax: 781.461.3113

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.

10dB

100 MHz to 2.7 GHz, 45 dB

FLTR

DET

RF Detector/Controller

REFERENCE

BAND GAP

–

I-V

V-I

VPOS

ENBL

VSET

V_UP

V_DN

AD8314

www.analog.com

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AD8314ACPZ-REEL Summary of contents

Page 1

FEATURES Complete RF detector/controller function Typical range:−58 dBV to −13 dBV −45 dBm to 0 dBm Ω Frequency response from 100 MHz to 2.7 GHz Temperature-stable linear-in-dB response Accurate to 2.7 GHz Rapid response ...

Page 2

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 ...

Page 3

SPECIFICATIONS 25°C, unless otherwise noted Table 1. Parameter OVERALL FUNCTION 1 Frequency Range Input Voltage Range Equivalent Power Range Logarithmic Slope Logarithmic Intercept Equivalent dBm Level INPUT INTERFACE DC Resistance to COMM ...

Page 4

AD8314 ABSOLUTE MAXIMUM RATINGS Table 2. Parameter Supply Voltage VPOS V_UP, V_DN, VSET, ENBL Input Voltage Equivalent Power Internal Power Dissipation θ (MSOP) JA θ (LFCSP, Paddle Soldered) JA θ (LFCSP, Paddle Not Soldered) JA Maximum Junction Temperature Operating Temperature ...

Page 5

PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS Table 3. Pin Function Descriptions Pin No. Mnemonic Description 1 RFIN RF Input. 2 ENBL Connect Pin VSET Setpoint Input for Operation in Controller Mode. To operate in detector mode connect VSET ...

Page 6

AD8314 TYPICAL PERFORMANCE CHARACTERISTICS 1.2 1.0 0.8 0.6 0.4 0.2 0 –75 –65 –55 –45 –35 (–52dBm) INPUT AMPLITUDE (dBV) Figure 4. V vs. Input Amplitude UP 1.2 1.0 +25°C 0.8 –40°C +85°C 0.6 +25°C 0.4 SLOPE AND INTERCEPT 0.2 ...

Page 7

FREQUENCY (GHz) Figure 10. Slope vs. Frequency; −40°C, +25°C, and +85°C 22 0.1GHz 21 0.9GHz 20 1.9GHz 2.5GHz 19 3.0 3.5 4.0 4.5 2.5 V (V) S ...

Page 8

AD8314 AVERAGE: 128 SAMPLES V 500mV/VERTICAL DN DIVISION V GND DN V 500mV/VERTICAL DIVISION UP V GND V UP ENBL 5V PER VERTICAL DIVISION V GND ENBL Figure 16. ENBL Response Time HP8648B EXT TRIG 10MHz REF OUTPUT SIGNAL GENERATOR ...

Page 9

V (V) S Figure 22. Maximum V Voltage vs AVERAGE: 128 SAMPLES 500mV/VERTICAL UP DIVISION V GND DN ...

Page 10

AD8314 THEORY OF OPERATION The AD8314 is a logarithmic amplifier (log amp) similar in design to the AD8313; further details about the structure and function can be found in the AD8313 data sheet and other log amps produced by ADI. ...

Page 11

Table 4. Typical Specifications at Selected Frequencies at 25°C (Mean and Σ) Slope (mV/dB) μ Frequency (GHz) 0.1 21.3 0.9 20.7 1.9 19.7 2.5 19.2 1 Refer to Figure 32. However, the logarithmic slope, the amount by which the output ...

Page 12

AD8314 APPLICATIONS BASIC CONNECTIONS Figure 31 shows connections for the basic measurement mode. A supply voltage required. The supply to the VPOS pin should be decoupled with a low inductance 0.1 μF surface-mount ...

Page 13

The intercept is the point at which the extrapolated linear response would intersect the horizontal axis (see Figure 32). Using the slope and intercept, the output voltage can be calculated for any input level within the specified input range by ...

Page 14

AD8314 When connected control loop, as shown in Figure 34, the voltage V is not explicitly used but is implicated in again UP setting up the required averaging time, by choice of C However, now the effective ...

Page 15

Figure 37 shows a third method for coupling the input signal into the AD8314, applicable in applications where the input signal is larger than the input range of the log amp. A series resistor, connected to the RF source, combines ...

Page 16

AD8314 MOBILE HANDSET POWER CONTROL EXAMPLES Figure 39 shows a complete power amplifier control circuit for a dual mode handset. This circuit is applicable to any dual mode handset using TDMA or CDMA technologies. The PF08107B (Hitachi) is driven by ...

Page 17

Figure 40 shows the relationship between the setpoint voltage, V and output power at 0.9 GHz. The overall gain control SET function is linear in dB for a dynamic range of over 40 dB. Figure 41 shows a similar circuit ...

Page 18

AD8314 OPERATION AT 2.7 GHz While the AD8314 is specified to operate at frequencies up to 2.5 GHz, it works at higher frequencies, although it does exhibit slightly higher output voltage temperature drift. Figure 43 shows the transfer function of ...

Page 19

Figure 46. Layout of Component Side (MSOP) Table 7. Evaluation Board Configuration Options Component Function TP1, TP2 Supply and Ground Vector Pins. SW1 Device Enable: When in Position A, the ENBL pin is connected to +V operating mode. In Position ...

Page 20

... AD8314-EVAL AD8314ACP-REEL −40°C to +85°C AD8314ACP-REEL7 −40°C to +85°C AD8314ACP-WP −40°C to +85°C 1 AD8314ACPZ-REEL −40°C to +85°C 1 AD8314ACPZ-RL7 −40°C to +85°C AD8314ACP-EVAL Pb-free part, # denotes lead-free product may be top or bottom marked. ©2006 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners ...

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