ADL5306

PRODUCTION

ADL5306

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

PRODUCTION

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Features

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

Additional 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 I_PD 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 V_BE) with a precise logarithmic relationship. A second such converter is used to handle the reference current, I_REF, 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 I_REF. The output of the logarithmic front-end is available at pin VLOG.

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Support

Analog Devices Support Portal is a one-stop shop to answer all your ADI questions.

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FAQs

Sales & Ordering FAQs

Part Models 2

1ku List Price Starting From $5.59

Documentation

Technical Documents 3

ADL5306: 60dB-range (100nA to 100µA) Low-Cost Logarithmic Converter Data Sheet (Rev.0) 07/02/2003

AN-643: Closed-Loop Control Circuit Implementation of the ADuC832 MicroConverter®IC and the AD8305 Logarithmic Converter in a Digital Variable Optical Attenuator (Rev.0) 08/19/2003

Logarithmic Processing Applied to Network Power Monitoring 01/01/2002

Reference Materials 1

Closed-Loop Control of Variable Optical Attenuators with Logarithmic Analog Processing 12/01/2003

Design Resources 2

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Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
ADL5306ACPZ-R2	16-Lead LFCSP (3mm x 3mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
ADL5306ACPZ-REEL7	16-Lead LFCSP (3mm x 3mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys