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AD8307AR-REEL7

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P25
Low Cost, DC to 500 MHz, 92 dB
Logarithmic Amplifier
Data Sheet
AD8307
Rev. E Document Feedback
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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
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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
FUNCTIONAL BLOCK DIAGRAM
BAND GAP REFERENCE
AND BIASING
SIX 14.3dB 900MHz
AMPLIFIER STAGES
MIRROR
INPUT-OFFSET
COMPENSATION LOOP
COM
INM
INP
ENBVPS
INT
OUT
OFS
AD8307
7.5mA
1.1kΩ
3
2
2µA
/dB
12.5kΩ
COM
NINE DETECTOR CELLS
SPACED 14.3dB
–INP
+INP
8
1
2
7
5
6
4
3
0
1082-001
Figure 1.
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.
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
AD8307* PRODUCT PAGE QUICK LINKS
Last Content Update: 02/23/2017
COMPARABLE PARTS
View a parametric search of comparable parts.
DOCUMENTATION
Application Notes
• AN-1040: RF Power Calibration Improves Performance of
Wireless Transmitters
• AN-691: Operation of RF Detector Products at Low
Frequency
Data Sheet
• AD8307: Low Cost DC-500 MHz, 92 dB Logarithmic
Amplifier Data Sheet
TOOLS AND SIMULATIONS
• ADIsimPLL™
• ADIsimRF
REFERENCE MATERIALS
Product Selection Guide
• RF Source Booklet
Technical Articles
• Design a Logamp RF Pulse Detector
• Detecting Fast RF Bursts using Log Amps
• Log Amps and Directional Couplers Enable VSWR
Detection
• Make Precise Base-Station Power Measurements
• Measurement and Control of RF Power, Part I
• Measurement and Control of RF Power, Part II
• Measurement and Control of RF Power, Part III
• Measuring the RF Power in CDMA2000 and W-CDMA High
Power Amplifiers (HPAs)
• Measuring VSWR and Gain in Wireless Systems
Tutorials
• Design and Operation of Automatic Gain Control Loops
for Receivers in Modern Communication Systems
DESIGN RESOURCES
• AD8307 Material Declaration
• PCN-PDN Information
• Quality And Reliability
• Symbols and Footprints
DISCUSSIONS
View all AD8307 EngineerZone Discussions.
SAMPLE AND BUY
Visit the product page to see pricing options.
TECHNICAL SUPPORT
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number.
DOCUMENT FEEDBACK
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AD8307 Data Sheet
Rev. E | Page 2 of 24
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications ....................................................................................... 1
Functional Block Diagram .............................................................. 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
Specifications ..................................................................................... 3
Absolute Maximum Ratings ............................................................ 4
ESD Caution .................................................................................. 4
Pin Configuration and Function Descriptions ............................. 5
Typical Performance Characteristics ............................................. 6
Log Amp Theory .............................................................................. 9
Progressive Compression .......................................................... 10
Demodulating Log Amps .......................................................... 11
Intercept Calibration .................................................................. 12
Offset Control ............................................................................. 12
Extension of Range ..................................................................... 13
Inter faces .......................................................................................... 14
Enable Interface .......................................................................... 14
Input Interface ............................................................................ 14
Offset Interface ........................................................................... 15
Output Interface ......................................................................... 15
Theory of Operation ...................................................................... 17
Basic Connections ...................................................................... 17
Input Matching ........................................................................... 18
Narrow-Band Matching ............................................................ 18
Slope and Intercept Adjustments ............................................. 19
Applications Information .............................................................. 20
Buffered Output .......................................................................... 20
Four-Pole Filter ........................................................................... 20
1 µW to 1 kW 50  Power Meter ............................................. 21
Measurement System with 120 dB Dynamic Range .............. 21
Operation at Low Frequencies .................................................. 22
Outline Dimensions ....................................................................... 23
Ordering Guide .......................................................................... 24
REVISION HISTORY
9/15—Rev. D to Rev. E
Changes to General Description Section ...................................... 1
Added Table 1; Renumbered Sequentially .................................... 1
7/08—Rev. C to Rev. D
Deleted DC-Coupled Applications Section ................................ 22
Deleted Operation Above 500 MHz Section .............................. 23
Updated Outline Dimensions ....................................................... 23
10/06—Rev. B to Rev. C
Updated Format .................................................................. Universal
Changes to Table 1 ............................................................................ 3
Changes to Table 3 ............................................................................ 5
Changes to Offset Interface ........................................................... 15
Changes to Output Interface ......................................................... 15
Updated captions to Outline Dimensions ................................... 24
Changes to Ordering Guide .......................................................... 24
6/03—Rev. A to Rev. B
Renumbered TPCs and Figures ........................................ Universal
Changes to Ordering Guide ............................................................. 3
Changes to Figure 24 ...................................................................... 17
Deleted Evaluation Board Information ....................................... 18
Updated Outline Dimensions ....................................................... 19
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AD8307AR-REEL7

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