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AD8307ARZ-REEL

更新时间： 2024-11-24 04:30:59

品牌	Logo	应用领域
亚德诺 - ADI		模拟计算功能信号电路放大器光电二极管
页数	文件大小	规格书
24页	510K
描述
Low Cost DC-500 MHz, 92 dB Logarithmic Amplifier

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替代型号

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AD8307ARZ-REEL 数据手册

Low Cost DC-500 MHz, 92 dB

Logarithmic Amplifier

AD8307

FUNCTIONAL BLOCK DIAGRAM

FEATURES

Complete multistage logarithmic amplifier

92 dB dynamic range: –75 dBm to +17 dBm

to –90 dBm using matching network

Single supply of 2.7 V minimum at 7.5 mA typ

DC to 500 MHz operation, ±1 dB linearity

Slope of 25 mV/dB, intercept of −84 dBm

Highly stable scaling over temperature

Fully differential dc-coupled signal path

100 ns power-up time, 150 μA sleep current

AD8307

BAND GAP REFERENCE

VPS

7.5mA

ENB

INT

AND BIASING

SIX 14.3dB 900MHz

AMPLIFIER STAGES

+INP

INP

INM

MIRROR

1.1kΩ

–INP

2µA

/dB

OUT

OFS

NINE DETECTOR CELLS

SPACED 14.3dB

12.5kΩ

COM

INPUT-OFFSET

COMPENSATION LOOP

APPLICATIONS

Conversion of signal level to decibel form

Transmitter antenna power measurement

Receiver signal strength indication (RSSI)

Low cost radar and sonar signal processing

Network and spectrum analyzers (to 120 dB)

Signal level determination down to 20 Hz

True decibel ac mode for multimeters

Figure 1.

GENERAL DESCRIPTION

The AD8307 is the first logarithmic amplifier made available in an

8-lead (SOIC-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 components. 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 control pin can disable the AD8307 to a standby

current of less than 150 μA.

only slightly at 500 MHz. There is no minimum frequency limit.

The AD8307 can be used at audio frequencies of 20 Hz or lower.

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

of nominally 2 μA/dB through an internal 12.5 kꢁ resistor. This

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 +1ꢀ dBm. This slope and intercept can be

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

output scaling can be lowered, for example to 15 mV/dB, to

permit utilization of the full dynamic range.

The AD8307 exhibits excellent supply insensitivity and temperature

stability of the scaling parameters. The unique combination 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 makes this product

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. The input

is fully differential and at a moderately high impedance (1.1 kΩ

in parallel with about 1.4 pF). The 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

5ꢀ 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. The logarithmic linearity is typically within ±0.3 dB up

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

The AD8307 operates over the industrial temperature range of

−40°C to +85°C, and is available in 8-lead SOIC and PDIP

packages.

Rev. C

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 registeredtrademarks arethe property of their respective owners.

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

Tel: 781.329.4700

Fax: 781.461.3113

www.analog.com

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AD8307ARZ-REEL 替代型号

型号	品牌	替代类型	描述	数据表
AD8307AR-REEL7	ADI	完全替代	Low Cost DC-500 MHz, 92 dB Logarithmic Amplifier
AD8307AR	ADI	完全替代	Low Cost DC-500 MHz, 92 dB Logarithmic Amplifier
AD8307ARZ	ADI	类似代替	Low Cost DC-500 MHz, 92 dB Logarithmic Amplifier

与AD8307ARZ-REEL相关器件

型号	品牌	获取价格	描述	数据表
AD8307ARZ-REEL7	ADI	获取价格	LOG OR ANTILOG AMPLIFIER, 490MHz BAND WIDTH, PDSO8, MS-012AA, SOIC-8
AD8307ARZ-RL7	ADI	获取价格	Low Cost DC-500 MHz, 92 dB Logarithmic Amplifier
AD8307-EB	ADI	获取价格	Low Cost DC-500 MHz, 92 dB Logarithmic Amplifier
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

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