Linear Technology's LTCR2645 is a family of quad 12-, 10-, and 8-bit PWM-to-voltage output DACs with an integrated high accuracy, low drift, 10 ppm/°C reference in a 16-lead MSOP package. It has rail-to-rail output buffers and is guaranteed monotonic. The LTC2645 has a full-scale output of 2.5 V using the 10 ppm/°C internal reference. It can operate with an external reference, which sets the full-scale output equal to the external reference voltage. Each DAC enters a pin-selectable idle state when the PWM input is held unchanged for more than 60 ms. The part operates from a single 2.7 V to 5.5 V supply and supports PWM input voltages from 1.71 V to 5.5 V.