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ADL5310:  120 dB RANGE (3 nA TO 3 mA) Dual Logarithmic Converter

Product Details


The ADL5310 is a low-cost dual logarithmic amplifier that converts input current over a wide dynamic range to a linear-in-dB output voltage. It is optimized for the determination of optical power in wide-ranging optical communication system applications including control circuitry for lasers, optical switches, attenuators, and amplifiers, as well as general system monitoring. The device is equivalent to a dual AD8305 with enhanced dynamic range (120 dB). While the ADL5310 contains two independent signal channels with individually-configurable transfer function constants (slope and intercept), internal bias circuitry is shared between channels for improved power consumption and channel matching. Dual converters in a single compact LFCSP package yield space-efficient solutions for measuring gain or attenuation across optical elements. Only a single supply is required, while optional dual supply operation offers added flexibility.

The ADL5310 employs an optimized translinear structure, which utilizes the accurate logarithmic relationship between a bipolar transistor's base-emitter voltage and collector current, with appropriate scaling by precision currents to compensate the inherent temperature dependence. Input and reference current pins sink current ranging from 3 nA to 3 mA (limited to ±60 dB between input and reference) into a fixed voltage defined by the VSUM potential, which is internally set to 500 mV but may be externally-grounded for dual-supply operation and additional applications requiring voltage inputs.

FEATURES and BENEFITS

  • Optimized for fiber optic photodiode interfacing
  • Measures current over 6 decades
    Law conformance 0.3 dB from 3 nA to 3 mA
  • Single- or dual-supply operation (3 V to
    ±5.5 V total)
  • Nominal slope of 10 mV/dB (200 mV/decade)
  • Nominal intercept of 300 pA (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 24-lead chip scale package
    (LFCSP 4 mm × 4 mm)
  • Low power: <10 mA quiescent current

Functional Block Diagram for ADL5310

Documentation

Title Content Type File Type
ADL5310: 120dB-range (3 nA - 3 mA) Dual Logarithmic Converter Data Sheet  (Rev A, 09/2004) (pdf, 668 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
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

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Price, packaging, availability

ADL5310 Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
ADL5310ACP-R2 Status: Obsolete 24 ld LFCSP (4x4mm w/2.10mm EP) 24 Ind Reel, 250 - - N  Material Info PDN Contact ADI
ADL5310ACP-REEL7 Status: Obsolete 24 ld LFCSP (4x4mm w/2.10mm EP) 24 Ind Reel, 1500 - - N  Material Info PDN Contact ADI
ADL5310ACP-WP Status: Obsolete 24 ld LFCSP (4x4mm w/2.10mm EP) 24 Ind Tray, 64 - - N  Material Info Notify Me Contact ADI
ADL5310ACPZ-REEL7 Status: Production 24 ld LFCSP (4x4mm w/2.10mm EP) 24 Ind Reel, 1500 - $11.47 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.

ADL5310 Evaluation Board
Model Description Price RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
ADL5310-EVALZ Status: Production Evaluation Board for 24 Lead LFCSP $100.19 Yes -

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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