Low-Voltage Current Sink Controls High-Voltage LED String

Portable displays using white LED backlights also need auxiliary LED lighting, an inductive boost to maximize backlight efficiency, a charge pump to allow independent control of each auxiliary LED, and programmable current sinks to control color and brightness. This tip shows how a programmable LED driver and low-cost boost converter can achieve a flexible, high-efficiency, easy-to-program solution.

New High-Resolution Multiplying DACs Excel at Handling AC Signals

All digital-to-analog converters (DACs) provide an output proportional to the product of the digitally set gain and an applied reference voltage. A multiplying DAC differs from a fixed-reference DAC in that it can apply a high-resolution digitally set gain to a varying wideband analog signal. ADI’s new resistance-ladder multiplying DACs are inherently suitable for ac signal-processing applications.