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
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.
Product Lifecycle Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (1)
Technical Articles (2)
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Sample & Buy
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