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ADL5306:  60 dB-RANGE (100 nA-100 µA) Low-Cost Logarithmic Converter

Product Details


The ADL5306 is a low cost micro-miniature logarithmic converter optimized for the determination of optical power in fiber-optic systems. It uses an advanced implementation of a classic translinear (junction-based) technique to provide a large dynamic range in a versatile and easily-used form. A single supply voltage of between 3 V and 5.5 V is adequate; dual supplies may optionally be used. The low quiescent current (typically 5 mA) permits use in battery-operating applications

The input current IPD of 100 nA to 100 µA applied to the INPT pin is the collector current of an optimally-scaled NPN transistor, which converts this current to a voltage (its VBE) with a precise logarithmic relationship. A second such converter is used to handle the reference current, IREF, applied to pin IREF. These input nodes are biased slightly above ground (0.5 V). This is generally acceptable for photodiode applications where the anode does not need to be grounded. Similarly, this bias voltage is easily accounted for in generating IREF. The output of the logarithmic front-end is available at pin VLOG.

FEATURES and BENEFITS

  • Optimized for fiber optic photodiode interfacing
  • Measures current over 3 decades
    Law conformance 0.1 dB from 100 nA to
    100 µA
  • Single- or dual-supply operation (3 V to
    ±5.5 V total)
  • Nominal slope of 10 mV/dB (200 mV/decade)
  • Nominal intercept of 1 nA (set by external resistor)
    Optional adjustment of slope and intercept
  • Full log-ratio capabilities
  • Temperature stable
  • Rapid response time for a given current level
  • Miniature 16-lead chip scale package
    (LFCSP 3 mm × 3 mm)
  • Low power: ~5 mA quiescent current

Functional Block Diagram for ADL5306

ADL5306 Diagram
Functional Block Diagram for ADL5306

OF NOTE ...

For more information on Optical Power Measurement Solutions and ADI's broad portfolio of Optical Networking products, visit Optical Networking

Documentation

Title Content Type File Type
ADL5306: 60dB-range (100nA to 100µA) Low-Cost Logarithmic Converter Data Sheet  (Rev 0, 07/2003) (pdf, 1015 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
Logarithmic Processing Applied to Network Power Monitoring  (pdf, 593 kB)
by Eric Newman, Analog Devices, Inc.
Technical Articles PDF
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
Analog Devices Unveils New Transmit/Receive and Control/Monitoring ICs
... Analog Devices Inc. recently introduced five new transmit/receive and monitoring/control integrated circuit (IC) solutions that provide important design alternatives for the development of components and modules for optical network systems. (Lightwave, 4/3/2003)
Product Reviews 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

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.

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Price, packaging, availability

ADL5306 Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
ADL5306ACP-R2 Status: Obsolete 16 ld LFCSP (3x3mm, 1.3mm exposed pad) 16 Ind Reel, 250 - - N  Material Info PDN Contact ADI
ADL5306ACP-REEL7 Status: Obsolete 16 ld LFCSP (3x3mm, 1.3mm exposed pad) 16 Ind Reel, 1500 - - N  Material Info PDN Contact ADI
ADL5306ACP-WP Status: Obsolete 16 ld LFCSP (3x3mm, 1.3mm exposed pad) 16 Ind Tray, 50 - - N  Material Info PDN Contact ADI
ADL5306ACPZ-R2 Status: Production 16 ld LFCSP (3x3mm, 1.3mm exposed pad) 16 Ind Reel, 250 - $5.22 Y  Material Info PCN Purchase
ADL5306ACPZ-REEL7 Status: Production 16 ld LFCSP (3x3mm, 1.3mm exposed pad) 16 Ind Reel, 1500 - $4.75 Y  Material Info PCN Purchase Sample
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.

ADL5306 Evaluation Board
Model Description Price RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
ADL5306-EVAL Status: Production Evaluation Board $100.19 No -

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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