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ADL5304

Analog Devices
Part Number ADL5304
Manufacturer Analog Devices
Description Logarithmic Converter
Published Feb 9, 2013
Detailed Description Data Sheet High Speed, 200 dB Range, Logarithmic Converter ADL5304 FEATURES Optimized for very fast response at all in...
Datasheet PDF File ADL5304 PDF File

ADL5304
ADL5304

Overview
Data Sheet High Speed, 200 dB Range, Logarithmic Converter ADL5304 FEATURES Optimized for very fast response at all input currents Overall bandwidth of >4 MHz for inputs >1 µA A single positive supply of 5 V is all that is required for operation over a specified 1 pA to 3 mA input range.
Dual-supply operation extends the specified input current range to 10 mA.
Bandwidth: 25 kHz at input of 1 nA and 350 kHz at 10 nA 10 decades of input range: 1 pA to 10 mA Law conformance: ±0.
25 dB from 100 pA to 100 µA Log ratio or fixed-intercept operation Precision voltage references and reference current Adaptive photodiode (PD) bias for low dark current Programmable log slope and intercept Default log slope of 10 mV/dB at VLOG pin Single- or dual-supply operation APPLICATIONS High accuracy optical power measurement Wide range baseband log compression Versatile detector for high speed APC loops GENERAL DESCRIPTION The ADL5304 is a high speed logarithmic converter with fast response and low noise over a 200 dB (1 pA to 10 mA) measurement range.
The ADL5304 provides a nominal logarithmic slope of 10 mV/dB (200 mV/decade); other values are easily configured.
Logarithmic intercept can be programmed over a wide range with the internal 100 nA current source or externally for log ratio applications.
The default intercept value of 3.
162 fA places the midpoint of the measurement range of 100 nA at VLOG = 1.
5 V.
The ADL5304 accepts two current inputs to the logarithmic argument.
The numerator input, INUM, flows in the collector of an NPN transistor, connected in a feedback path around a low offset JFET amplifier.
The denominator current, IDEN, is treated in the same way, which allows for log ratio operation.
The input summing nodes (INUM and IDEN) operate at a constant default voltage of 1.
5 V.
The VSM1 to VSM4 pins flank the INUM and IDEN inputs to provide a guard voltage to minimize leakage currents.
Adaptive photodiode biasing is provided for optical measurements.
A monitor current...


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