AD8318ACPZ Analog Devices, AD8318ACPZ Datasheet

AD8318ACPZ

Manufacturer Part Number

AD8318ACPZ

Description

Manufacturer

Analog Devices

Datasheet

1.AD8318ACPZ.pdf (17 pages)

Specifications of AD8318ACPZ

Package

LFCSP16

Date_code

10+

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Preliminary Technical Data

FEATURES

Wide Bandwidth: 1 MHz to 8 GHz

High Accuracy: ±1.0 dB over 55 dB up to 5.8 GHz

Stability Over Temperature ±0.5 dB

Low Noise Measurement/Controller Output VOUT

Pulse Response Time 8/13 nS (Fall/Rise)

Integrated Temperature Sensor

Small Footprint CSP Package

Power-Down Feature: <1.5 mW at 5V

Single Supply Operation: 5V @ 65 mA

Fabricated Using High Speed SiGe Process

APPLICATIONS

RF Transmitter PA Setpoint Control & Level Monitoring

RSSI Measurement in Base Stations, WLAN, Radar

GENERAL DESCRIPTION

The AD8318 is a demodulating logarithmic amplifier, capable of

accurately converting an RF input signal to a corresponding decibel-

scaled output. It employs the progressive compression technique

over a cascaded amplifier chain, each stage of which is equipped

with a detector cell. The device can be used in either measurement

or controller modes. The AD8318 maintains accurate log

conformance for signals of 1 MHz to 6 GHz and provides useful

operation to 8 GHz. The input range is typically –60 dBm to 0 dBm

(re 50 ) with error less than 1dB. The AD8318 has a 8 ns response

time that enables RF burst detection to beyond 60 MHz. The device

provides unprecedented logarithmic intercept stability versus

ambient temperature conditions. A 2mV/K slope temperature

sensor output is also provided for additional system monitoring. A

single supply of +5 V is required. Current consumption is typically

65 mA. Power consumption decreases to < 1mW when the device is

disabled.

The AD8318 can be configured to provide a control voltage to a

power amplifier or a measurement output, from pin VOUT. Since

the output can be used for controller applications, special attention

Rev. PrF 4/2/04

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

companies.

Logarithmic Detector/Controller

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

Tel: 781.329.4700

Fax: 781.326.8703

has been paid to minimize wide-band noise. In this mode, the

set-point control voltage is applied to VSET. The feedback loop

through an RF amplifier is closed via VOUT; the output of

which regulates the amplifier’s output to a magnitude

corresponding to V

output capability at the VOUT pin, suitable for controller

applications. As a measurement device, VOUT is externally

connected to VSET to produce an output voltage V

decreasing linear-in-dB function of the RF input signal

amplitude.

The logarithmic slope is 25 mV/dB, determined by the VSET

interface. The intercept is 20 dBm (re 50 , CW input) using the

INHI input. These parameters are very stable against supply

and temperature variations.

The AD8318 is fabricated on a SiGe bipolar IC process and is

available in a 4x4 mm, 16-pin MLFCSP package, for the

operating temperature range of –40

TEMP

INLO

INHI

DET

Temp

Sensor

Figure 1. Functional Block Diagram

FUNCTIONAL BLOCK DIAGRAM

CMIP

VPSI

1 MHz – 8 GHz, 60 dB

DET

SET

. The AD8318 provides 0V to 3.9V

ENBL

Gain

Bias

DET

C to +85

TADJ

Slope

C..

www.analog.com

AD8318

CMOP

VPSO

OUT

that is a

VSET

VOUT

CLPF

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