ADL5303
Info : RECOMMENDED FOR NEW DESIGNS
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ADL5303

160 dB Range, 100 pA to 10 mA Logarithmic Converter

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Info : RECOMMENDED FOR NEW DESIGNS tooltip
Info : RECOMMENDED FOR NEW DESIGNS tooltip
Part Details
Part Models 3
1ku List Price Starting From $5.50
Features
  • Optimized for fiber optic photodiode interfacing
  • 8 full decades of range
  • Law conformance: 0.1 dB from 1 nA to 1 mA
  • Single-supply operation: 3.0 V to 5.5 V
  • Complete and temperature stable
  • Accurate laser trimmed scaling
  • Logarithmic slope of 10 mV/dB (at the VLOG pin)
  • Basic logarithmic intercept at 100 pA
  • Easy adjustment of slope and intercept
  • Output bandwidth of 10 MHz, 15 V/μs slew rate
  • Miniature 16-lead package (LFCSP)
  • Low power: ~4.5 mA quiescent current (enabled)
Additional Details
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The ADL5303 is a monolithic logarithmic detector optimized for the measurement of low frequency signal power in fiber optic systems and offers a large dynamic range in a versatile and easily used form. Wide measurement range and accuracy are achieved using proprietary design and precise laser trimming. The ADL5303 requires only a single positive supply, VPS, of 5 V. When using low supply voltages, the log slope can be altered to fit the available span. Low quiescent current and chip disable facilitate use in battery-operated applications.

The input current, IPD, flows in the collector of an optimally scaled NPN transistor, connected in a feedback path around a low offset JFET amplifier. The current summing input node operates at a constant voltage, independent of current, with a default value of 0.5 V; this may be adjusted over a wide range. An adaptive biasing scheme is provided for reducing photo-diode dark current at very low light input levels. The VPDB pin applies approximately 0.1 V reverse bias across the photodiode for IPD = 100 pA, rising linearly to 2.0 V of reverse bias at IPD = 10 mA to improve response time at higher power levels. The input pin INPT is flanked by the VSUM guard pins that track the voltage at the summing node. Connecting the exposed pad of the device to the VSUM pins provides a continuous guard to minimize leakage into the INPT pin.

The default value of the logarithmic slope at the VLOG output is set by an internal 5 kΩ resistor. Logarithmic slope can be lowered with an external shunt resistor or increased using the buffer and a pair of external feedback resistors. The addition of a capacitor at the VLOG pin provides a simple low-pass filter. The intermediate voltage, VLOG, is buffered in an output stage that can swing to within about 100 mV of ground and the positive supply, VPS, and provides a peak current drive capacity of ±20 mA. An on-board 2 V reference is provided to facilitate the repositioning of the intercept. The incremental bandwidth of a translinear logarithmic amplifier inherently diminishes for small input currents. At IPD =1 nA, the bandwidth of the ADL5303 is approximately 2 kHz increasing in proportion to IPD up to a maximum value of 10 MHz.

APPLICATIONS

  • High accuracy optical power measurement
  • Wide range baseband log compression
  • Versatile detector for APC loops
Part Models 3
1ku List Price Starting From $5.50

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Documentation

Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
ADL5303ACPZ-R2
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ADL5303ACPZ-R7
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ADL5303ACPZ-RL
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Part Models

Product Lifecycle

PCN

Apr 3, 2017

- 16_0230

Assembly Transfer of Select LFCSP Products to ASE Korea

Apr 28, 2014

- 13_0224

Assembly Transfer of Select 2x3 and 3x3mm LFCSP Products to STATS ChipPAC China.

Filter by Model

reset

Reset Filters

Part Models

Product Lifecycle

PCN

Apr 3, 2017

- 16_0230

arrow down

Assembly Transfer of Select LFCSP Products to ASE Korea

Apr 28, 2014

- 13_0224

arrow down

Assembly Transfer of Select 2x3 and 3x3mm LFCSP Products to STATS ChipPAC China.

Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 1

EVAL-ADL5303

ADL5303 Evaluation Board

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EVAL-ADL5303

ADL5303 Evaluation Board

ADL5303 Evaluation Board

Product Detail

The board is factory set for photoconductive mode with a buffer gain of unity, providing a slope of 10 mV/dB and an intercept of 100 pA. By substituting resistor and capacitor values, all of the application circuits presented in the ADL5303 data sheet can be evaluated.
Tools & Simulations

Tools & Simulations 1

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

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