ADL5306ACP-R2

60分贝范围（ 100 nA至100 UA ）低成本对数转换器 60 dB Range 100 nA to 100 UA 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

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*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

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Optimized for fiber optic photodiode interfacing

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Measures current over 3 decades

Law conformance 0.1 dB from 100 nA to 100 µA

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Single- or dual-supply operation 3 V to ±5.5 V total

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Nominal slope of 10 mV/dB 200 mV/decade

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Nominal intercept of 1 nA set by external resistor

Optional adjustment of slope and intercept

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Full log-ratio capabilities

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Temperature stable

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Rapid response time for a given current level

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Miniature 16-lead chip scale package

LFCSP 3 mm × 3 mm

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Low power: ~5 mA quiescent current