MAX4206

(All voltages referenced to GND, unless otherwise noted.)
V_CC.........................................................................-0.3V to +12V
V_EE............................................................................-6V to +0.3V
Supply Voltage (V_CC to V_EE) ............................................... +12V
REFVOUT......................................................(V_EE - 0.3V) to +3.0V
OSADJ, SCALE, REFISET ..............................(V_EE - 0.3V) to +5.5V
REFIIN, LOGIIN ........................................(V_EE - 0.3V) to VCMVIN
LOGV1, LOGV2, CMVOUT,
REFIOUT ..........................................(V_EE - 0.3V) to (V_CC + 0.3V)
CMVIN...........................................................(V_EE - 0.3V) to +1V
Continuous Current (REFIIN, LOGIIN) ..............................10mA
Continuous Power Dissipation (T_A = +70°C)
16-Pin Thin QFN (derate 16.9mW/°C above +70°C) .1349mW
Operating Temperature Range ......................-40°C to +85°C
Junction Temperature ..................................................+150°C
Storage Temperature Range .......................-65°C to +150°C
Lead Temperature (soldering, 10s) .............................+300°C

The MAX4206 logarithmic amplifier computes the log ratio of an input current relative to a reference current (externally or internally generated) and provides a corresponding voltage output with a default 0.25V/decade scale factor. The device operates from a single +2.7V to +11V supply or from dual ±2.7V to ±5.5V supplies and is capable of measuring five decades of input current across a 10nA to 1mA range.

The MAX4206's uncommitted op amp can be used for a variety of purposes, including filtering noise, adding offset, and adding additional gain. A 0.5V reference is also included to generate an optional precision current reference using an external resistor, which adjusts the log intercept of the MAX4206. The output-offset voltage and the adjustable scale factor are also set using external resistors.

The MAX4206 is available in a space-saving 16-pin thin QFN package (4mm x 4mm x 0.8mm), and is specified for operation over the -40°C to +85°C extended temperature range.