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Maxim > Design Support > Technical Documents > Application Notes > Amplifier and Comparator Circuits > APP 4057
Maxim > Design Support > Technical Documents > Application Notes > Communications Circuits > APP 4057
Maxim > Design Support > Technical Documents > Application Notes > Optoelectronics > APP 4057
Keywords: current monitor speed, MAX4007 speed
APPLICATION NOTE 4057
How to Increase the Operating Speed on the
MAX4007
Jun 12, 2007
Abstract: The MAX4007 is a precision, high-side, high-voltage current monitor specifically designed for
monitoring photodiode current in fiber applications. This application note describes a simple way to
increase the MAX4007's response time for GPON burst-mode operation.
Description of Operation
The MAX4007 is a current monitor that outputs a current proportional to that flowing out from its REF pin.
If the output is to be sampled by an ADC, however, the output must be first converted to a voltage. A
simple way to achieve this is by using an output resistor in parallel with a 10nF anti-aliasing capacitor.
This arrangement (Figure 1) can be seen in the device's data sheet.
Figure 1. MAX4007 application example.
Having an output resistor in this configuration loads the output of the current monitor, causing its
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