Description

The MAX4007/MAX4008 precision, high-side, high-voltagecurrent monitors are specifically designed for monitoringphotodiode current in fiber applications. Theyoffer a connection point for the reference current and amonitor output that produces a signal proportional tothe reference current. The monitor output of theMAX4007 is a current proportional to the reference current.The monitor output of the MAX4008 is a voltageproportional to the reference current. The current monitorshave six decades of dynamic range and monitorreference currents of 250nA to 2.5mA with better than5% accuracy. The photodiode current can be monitoredfrom 10nA to 10mA with reduced accuracy.The MAX4007/MAX4008 accept a supply voltage of+2.7V to +76V, suitable for APD or PIN photodiode applications.Internal current limiting (20mA, typ) protects thedevices against short circuit to ground. A clamp diodeprotects the monitor output from overvoltage. Additionally,these devices feature thermal shutdown if the die temperaturereaches +150°C.The MAX4007/MAX4008 are available in tiny, spacesaving6-pin SOT23 packages, and operate over the extended temperature range of -40°C to +85°C.ApplicationsConsumer ElectronicsCurrent-to-Voltage ConversionLaboratory InstrumentationLevel TranslationMedical InstrumentationPhotodiode Current-Monitoring SystemsPortable Instrumentation