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Signal Processing Applications

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Digital control of two colors with one laser driver The new laser diode driver iC-HTP permits microcontroller-based driving of laser diodes with common cathodes or P-type laser diodes in CW mode (Continuous Wave). With this device either Automatic Power Control (APC), Automatic Current Control (ACC), or a full controller-based power regulation can be used. For driving N-type and M-type laser diodes in CW mode, the similar laser diode driver iC-HT can be used. The maximum laser diode current per channel is 750 mA. Both channels can be connected in parallel for higher laser diode currents of up to 1.5 A. A current limit can also be configured for each channel. Due to the high integration level of the analog functions for driving the laser diodes with a microcontroller interface, multi-channel laser diode control units can be implemented directly. Apart from the iC-HTP only a microcontroller and laser diodes with different wavelengths, for example, are required.

Internal operating points and voltages can be output through analog/digital converters. The integrated temperature sensor permits the system temperature to be monitored and can also be used for feedback in the control circuit. [Continue reading →]

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Signal Processing Techniques

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For optical and magnetic length gauges featuring decimal gratings, iC-MQF offers a sine resolution of up to 4000 edges. The circuit incorporates a signal conditioning analog front end, a vector-tracking converter for real-time conversion without latency, as well as fault-tolerant RS422 driver stages which output the incremental signals. Reverse polarity protection is also embedded and covers all cable connections.[Continue reading →]

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