AD8307-EB

更新时间： 2024-11-26 22:39:03

品牌	Logo	应用领域
亚德诺 - ADI		放大器
页数	文件大小	规格书
20页	397K
描述
Low Cost DC-500 MHz, 92 dB Logarithmic Amplifier

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AD8307-EB 数据手册

Low Cost DC-500 MHz, 92 dB

Logarithmic Amplifier

AD8307

FEATURES

FUNCTIO NAL BLO CK D IAGRAM

Com plete Multistage Logarithm ic Am plifier

92 dB Dynam ic Range: –75 dBm to +17 dBm

to –90 dBm Using Matching Netw ork

Single Supply of 2.7 V Min at 7.5 m A Typical

DC-500 MHz Operation, ؎1 dB Linearity

Slope of 25 m V/ dB, Intercept of –84 dBm

Highly Stable Scaling Over Tem perature

Fully Differential DC-Coupled Signal Path

100 ns Pow er-Up Tim e, 150 ␮A Sleep Current

AD8307

BANDGAP REFERENCE

AND BIASING

VPS

ENB

INT

SUPPLY

7.5mA

ENABLE

INT. ADJ

SIX 14.3dB 900MHz

AMPLIFIER STAGES

INP

1.15k⍀

+INPUT

–INPUT

MIRROR

INM

2␮A

/dB

OUT

OUTPUT

NINE DETECTOR CELLS

SPACED 14.3dB

12.5k⍀

APPLICATIONS

COMMON

COM

Conversion of Signal Level to Decibel Form

Transm itter Antenna Pow er Measurem ent

Receiver Signal Strength Indication (RSSI)

Low Cost Radar and Sonar Signal Processing

Netw ork and Spectrum Analyzers (to 120 dB)

Signal Level Determ ination Dow n to 20 Hz

True Decibel AC Mode for Multim eters

OFS

INPUT-OFFSET

COMPENSATION LOOP

OFS. ADJ.

T he output is a voltage scaled 25 mV/dB, generated by a current

of nominally 2 µA/dB through an internal 12.5 kΩ resistor. T his

voltage varies from 0.25 V at an input of –74 dBm (that is, the

ac intercept is at –84 dBm, a 20 µV rms sine input), up to 2.5 V

for an input of +16 dBm. This slope and intercept can be trimmed

using external adjustments. Using a 2.7 V supply, the output

scaling may be lowered, for example to 15 mV/dB, to permit

utilization of the full dynamic range.

P RO D UCT D ESCRIP TIO N

The AD8307 is the first logarithmic amplifier in an 8-lead (SO-8)

package. It is a complete 500 MHz monolithic demodulating

logarithmic amplifier based on the progressive compression

(successive detection) technique, providing a dynamic range of

92 dB to ±3 dB law-conformance and 88 dB to a tight ±1 dB

error bound at all frequencies up to 100 MHz. It is extremely

stable and easy to use, requiring no significant external compo-

nents. A single supply voltage of 2.7 V to 5.5 V at 7.5 mA is

needed, corresponding to an unprecedented power consumption

of only 22.5 mW at 3 V. A fast-acting CMOS-compatible con-

trol pin can disable the AD8307 to a standby current of under

150 µA.

T he AD8307 exhibits excellent supply insensitivity and tem-

perature stability of the scaling parameters. T he unique combi-

nation of low cost, small size, low power consumption, high

accuracy and stability, very high dynamic range, and a frequency

range encompassing audio through IF to UHF, make this prod-

uct useful in numerous applications requiring the reduction of a

signal to its decibel equivalent.

Each of the cascaded amplifier/limiter cells has a small-signal

gain of 14.3 dB, with a –3 dB bandwidth of 900 MHz. T he

input is fully differential and at a moderately high impedance

(1.1 kΩ in parallel with about 1.4 pF). T he AD8307 provides a

basic dynamic range extending from approximately –75 dBm

(where dBm refers to a 50 Ω source, that is, a sine amplitude of

about ±56 µV) up to +17 dBm (a sine amplitude of ±2.2 V).

A simple input-matching network can lower this range to –88 dBm

to +3 dBm. T he logarithmic linearity is typically within ±0.3 dB

up to 100 MHz over the central portion of this range, and is

degraded only slightly at 500 MHz. T here is no minimum

frequency limit; the AD8307 may be used at audio frequencies

(20 Hz) or even lower.

T he AD8307 is available in the industrial temperature range of

–40°C to +85°C, and in 8-lead SOIC and PDIP packages.

REV. A

Inform ation furnished by Analog Devices is believed to be accurate and

reliable. However, no responsibility is assum ed by Analog Devices for its

use, nor for any infringem ents of patents or other rights of third parties

which m ay result from its use. No license is granted by im plication or

otherwise under any patent or patent rights of Analog Devices.

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

Tel: 781/ 329-4700

Fax: 781/ 326-8703

World Wide Web Site: http:/ / w w w .analog.com

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与AD8307-EB相关器件

型号	品牌	获取价格	描述	数据表
AD8309	ADI	获取价格	5 MHz.500 MHz 100 dB Demodulating Logarithmic Amplifier with Limiter Output
AD8309ARU	ADI	获取价格	5 MHz.500 MHz 100 dB Demodulating Logarithmic Amplifier with Limiter Output
AD8309ARU-REEL	ADI	获取价格	5 MHz.500 MHz 100 dB Demodulating Logarithmic Amplifier with Limiter Output
AD8309ARU-REEL7	ADI	获取价格	5 MHz.500 MHz 100 dB Demodulating Logarithmic Amplifier with Limiter Output
AD8309ARUZ	ADI	获取价格	5 MHzâ500 MHz 100 dB Demodulating Logarithm
AD8309ARUZ-REEL7	ADI	获取价格	5 MHz TO 500 MHz, 100 dB Demodulating Logarithmic Amplifier with Limiter Output
AD8309-EVAL	ADI	获取价格	5 MHz.500 MHz 100 dB Demodulating Logarithmic Amplifier with Limiter Output
AD830AN	ADI	获取价格	High Speed, Video Difference Amplifier
AD830ANZ	ADI	获取价格	High Speed, Video Difference Amplifier
AD830ANZ	ROCHESTER	获取价格	1 CHANNEL, VIDEO AMPLIFIER, PDIP8, ROHS COMPLIANT, PLASTIC, MS-001, DIP-8

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