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Many portable electronic devices could benefit from a visual indication when their battery requires replacement. Typical low-battery indicators simply turn on an LED when the battery voltage drops below a certain value. Such circuits actually accelerate the battery`s extinction by drawing excessive current. The circuit in Figure 1 draws a mere 1 m A in its standby mode and averages only 20 m A when activated. The low current imposes a minimal burden on any battery circuit......

The ADN2847 is a 3 V dual-loop 50 Mbps to 3.3 Gbps laser diode driver. To use the board in an optical configuration, a suitable laser diode must be soldered onto the board. The monitor photodiode (MPD) current is fed into the ADN2847 to control the average power and extinction ratio...