LTC2645 An Opto-Isolated, PWM Regulated 4mA to 20mA Process Controller

The LTC®2645 is a family of quad 12-, 10-, and 8-bit PWMto- voltage output DACs with an integrated high accuracy, low drift, 10ppm/°C reference in a 16-lead MSOP package. It has rail-to-rail output buffers and is guaranteed monotonic.