smallembedded

Use a simple voltage regulator circuit to provide a constant voltage to a high-side current monitor

Overview

The voltage drop between the current monitor and the avalanche photodiode (APD) changes with temperature and the current flowing through the photodiode. Therefore, in fiber optic transmission and instrumentation systems, detecting average photodiode current is particularly important for effective system management.

Typical application circuit

The MAX4007 / MAX4008 are high-precision, high-side, high-voltage current monitors designed to monitor photodiode current. Both devices provide a connection point (REF) for the reference current and a sense output proportional to the reference current. Connect an appropriate APD (Avalanche Photodiode) or PIN (Anode-Intrinsic-Cathode) photodiode at the REF pin of the IC as shown in Figure 1. The REF pin sources current to the photodiode cathode.

Figure 1. Typical application circuit for the MAX4007 high-side current monitor

Documentation

Application Note

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