Linear Technology Corporation (Milpitas, CA) introduces the LTC2645, a quad-channel 12-bit/10-bit/8-bit PWM-to-voltage output digital-to-analog converter (DAC) with 10ppm/°C reference. These parts convert PWM input signals to 12-bit accurate, stable, buffered voltage outputs in less than 8µs, eliminating the ripple and delay typically associated with analog filters. The LTC2645 provides a simple bolt-on solution to accurately set and adjust four voltages without a single line of code required. Offered in a small 16-lead MSOP package, the LTC2645 is ideal for biasing, calibration, level setting, power supply adjustment, and to enable opto-isolated communications in applications such as industrial automation, 4-20mA process control, instrumentation, test equipment and optical modules. A dual version, the LTC2644, is available in a 12-lead MSOP package. Other features include:

• PWM input frequencies from 30Hz up to 100kHz.
• DAC outputs capable of sourcing or sinking 5mA (3V) or 10mA (5V).
• A full-scale output of 2.5V using the internal 10ppm/°C reference or a full-scale output equal to the external reference.

For more information on the LTC2645, visit