MAX4207

PRODUCTION

Precision Transimpedance Logarithmic Amplifier with Over 5 Decades of Dynamic Range

Data Sheet (Rev. 1) Product Selection Table
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Overview

  • ±2.7V to ±5.5V Dual-Supply Operation
  • 5 Decades of Dynamic Range (10nA to 1mA)
  • Monotonic Over a 1nA to 1mA Range
  • -0.25V/Decade Internally Trimmed Output Scale Factor
  • Adjustable Output Scale Factor
  • Adjustable Output Offset Voltage
  • Internal 10nA to 10µA Reference Current Source
  • Input Amplifiers Summing Nodes at Ground
  • Small 16-Pin Thin QFN Package (4mm x 4mm x 0.8mm)
  • -40°C to +85°C Operating Temperature Range
  • Evaluation Kit Available (Order MAX4206EVKIT)

The MAX4207 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 dual ±2.7V to ±5.5V supplies and is capable of measuring five decades of input current across a 10nA to 1mA range.

The MAX4207's uncommitted op amp can be used for a variety of functions, 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 MAX4207. The output-offset voltage and the adjustable scale factor are also set using external resistors.

The MAX4207 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.

Applications

  • Analog Signal Processing
  • Medical Instrumentation
  • Photodiode Current Monitoring
  • Portable Instrumentation
MAX4207
Precision Transimpedance Logarithmic Amplifier with Over 5 Decades of Dynamic Range
MAX4207: Typical Operating Circuit
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Documentation

Data Sheet 1

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Hardware Ecosystem

Parts Product Life Cycle Description
Transimpedance Amplifiers (TIA) 1
MAX4206
PRODUCTION Precision Transimpedance Logarithmic Amplifier with Over 5 Decades of Dynamic Range
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