AD8307ANZ1 データシートの表示（PDF） - Analog Devices

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AD8307ANZ1

Low Cost, DC to 500 MHz, 92 dB Logarithmic Amplifier

Analog Devices 

Data Sheet

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 typical

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

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

GENERAL DESCRIPTION

The AD8307 is the first logarithmic amplifier made available in

an 8-lead SOIC_N 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. The

AD8307 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. A fast acting CMOS-compatible control

pin can disable the AD8307 to a standby current of 150 μA.

The AD8307 operates over the industrial temperature range of

−40°C to +85°C and is available in an 8-lead SOIC package and

an 8-lead PDIP.

Low Cost, DC to 500 MHz, 92 dB

Logarithmic Amplifier

AD8307

FUNCTIONAL BLOCK DIAGRAM

VPS 7

7.5mA

AD8307

BAND GAP REFERENCE

AND BIASING

6 ENB

INP

+INP

8

INM 1 1.1kΩ

–INP 3

SIX 14.3dB 900MHz

AMPLIFIER STAGES

COM 2

NINE DETECTOR CELLS

SPACED 14.3dB

INPUT-OFFSET

COMPENSATION LOOP

5 INT

MIRROR

2µA

/dB

2

4 OUT

12.5kΩ

COM

3 OFS

Figure 1.

Table 1. Next Generation Upgrades for the AD8307

Device No. Product Description

AD8310 15 ns Response Time, Buffered Output

ADL5513

Lower Input Range (80 dB), Operation to 4 GHz,

Higher Power Consumption

AD8309 Higher Input Range (100 dB), Limiter Output

Rev. E

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