Digital-to-analog converter

摘要

An integrating digital-to-analog converter circuit includes an operational-amplifier based integrator, a plurality of constant current sources each providing constant current at a respective different level, and a plurality of switches each associated with a respective current source for coupling the same to the integrator. A plurality of digital counters are arranged to hold a predetermined portion of an n-bit digital word loaded therein and to count clock pulses until their contents reach a predetermined count. At those times, a carry pulse is generated in each such digital counter and the associated switch is opened to cut off the associated current source. Such a digital-to-analog converter circuit can convert data words of relatively high bit length without the need for an excessively high frequency clocking signal.