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

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 ...More

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

Product Description

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.

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  • 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

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OF NOTE ...

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*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.
**Sample availability may be better than production availability. Please enter samples into your cart to check sample availability.