GENERAL DESCRIPTION
The ADL5304is a high speed logarithmic converter with fast response and low noise over a 200 dB (1 pA to 10 mA) measure ment range. The ADL5304provides 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.

FEATURES
Optimized for very fast response at all input currents
  Overall bandwidth of >4 MHz for inputs >1 μA
  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