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AD8304:  160 dB Logarithmic Amplifier with Photo-Diode Interface

Product Details


The AD8304 is a monolithic logarithmic detector optimized for the measurement of low frequency signal power in fiber optic systems. It uses an advanced translinear technique to provide an exceptionally large dynamic range in a versatile and easily used form. Its wide measurement range and accuracy are achieved using proprietary design techniques and precise laser trimming. In most applications only a single positive supply, VP, of 5 V will be required, but 3.0 V to 5.5 V can be used, and certain applications benefit from the added use of a negative supply, VN. When using low supply voltages, the log slope is readily altered to fit the available span. The low quiescent current and chip disable features facilitate use in battery-operated applications.

The AD8304 is available in a 14-lead TSSOP package and specified for operation from -40°C to +85°C.

FEATURES and BENEFITS

  • Optimized for Fiber Optic Photodiode Interfacing
  • Eight Full Decades of Range
  • Single-Supply Operation (3.0 V– 5.5 V)
  • Complete and Temperature Stable
  • 1-, 2-, or 3-Pole Low-Pass Filtering at Output
  • Miniature 14-Lead Package (TSSOP)
  • Accurate Laser-Trimmed Scaling:
    Logarithmic Slope of 10 mV/dB
    (at VLOG Pin)
    Basic Logarithmic Intercept at 100 pA
    Easy Adjustment of Slope and Intercept
  • Output Bandwidth of 10 MHz,
    15 V/µs Slew Rate
  • Low Power: ~4.5 mA Quiescent Current (Enabled)

Functional Block Diagram for AD8304

AD8304 Diagram
Functional Block Diagram for AD8304

OF NOTE ...

For further information, please contact log.amps@analog.com.

Documentation

Title Content Type File Type
AD8304: 160 dB Range (100 pA-10 mA) Logarithmic Converter Data Sheet  (Rev A, 08/2002) (pdf, 573 kB) Data Sheets PDF
AN-643: Closed-Loop Control Circuit Implementation of the ADuC832 MicroConverter®IC and the AD8305 Logarithmic Converter in a Digital Variable Optical Attenuator  (pdf, 395 kB) Application Notes PDF
CN-0057: Interfacing the ADL5317 High Side Current Mirror to a Translinear Logarithmic Amplifier in an Avalanche Photodiode Power Detector Application  (pdf, 107 kB) Circuit Note PDF
CN-0056: Interfacing the ADL5315 High Side Current Mirror to a Translinear Logarithmic Amplifier in a Photodiode Power Detector Application  (pdf, 107 kB) Circuit Note PDF
Log Amps and Directional Couplers Enable VSWR Detection  (pdf, 2223 kB)
by Anil Rachakonda and Larry Hawkins, Analog Devices, Inc. (RF Design, 1/1/2007)
Technical Articles PDF
Design a Logamp RF Pulse Detector  (pdf, 338 kB)
by Eamon Nash
(Microwaves & RF, January 1, 2000)
Technical Articles PDF
Mixed Signal ICs Lend Flexibility to EDFA Control Applications
(WDM Solutions, April 2002)
Technical Articles HTML
Logarithmic Processing Applied to Network Power Monitoring  (pdf, 593 kB)
by Eric Newman, Analog Devices, Inc.
Technical Articles PDF
Detecting Fast RF Bursts Using Log Amps
(Analog Dialogue, Vol. 36, No. 5, September-October, 2002)
Analog Dialogue HTML
Closed-Loop Control of Variable Optical Attenuators with Logarithmic Analog Processing
By Eric J. Newman and Matthew Pilotte, Analog Devices, Inc. (Analog Dialogue, Vol 37, December 2003)
Analog Dialogue HTML
Optical and High Speed Networking  (pdf, 2236 kB)
Analog Devices’ optical and high speed networking ICs solve a depth and breadth of challenges faced by today’s designers of datacom and telecom systems, optical modules, and subsystems. Analog Devices products address a wide range of networking applications from O/E/O conversion, clock recovery, and backplane transmission to monitoring and control of optical power, power management, and clock generation and distribution.
Overview PDF
RAQs index Rarely Asked Questions HTML
Glossary of EE Terms Glossary HTML

Design Tools,Models,Drivers & Software

Title Content Type File Type
AD8304 Component Calculator
A tool for calculating component values for changing the slope and intercept of the AD8304 logarithmic converter.
Design Calculators HTML
AD8304 Log Amp - Raise or Lower Intercept
Calculates component values to change the AD8304 slope and intercept. This tool graphs the new curve showing the output voltage vs input current and the schematic.
Design Assistants HTML

Evaluation Kits & Symbols & Footprints

Evaluation Boards & KitsView the Evaluation Boards and Kits page for documentation and purchasing

Symbols and Footprints— Analog Devices offers Symbols & Footprints which are compatible with a large set of today’s CAD systems for broader and easier support.

Product Recommendations & Reference Designs

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Price, packaging, availability

AD8304 Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
AD8304ARU Status: Production 14 ld TSSOP 14 Ind Tube, 96 $16.08 $14.62 N  Material Info PCN Purchase
AD8304ARU-REEL7 Status: Production 14 ld TSSOP 14 Ind Reel, 1000 - $14.62 N  Material Info PCN Purchase
AD8304ARUZ Status: Production 14 ld TSSOP 14 Ind Tube, 96 $13.92 $12.65 Y  Material Info PCN Purchase Sample
AD8304ARUZ-RL7 Status: Production 14 ld TSSOP 14 Ind Reel, 1000 - $12.65 Y  Material Info PCN Purchase
Price Table Help

The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.

AD8304 Evaluation Board
Model Description Price RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
AD8304-EVALZ Status: Contact ADI Evaluation Board $100.19 Yes - Contact ADI

Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.

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