AN2199 - Analog - DAC with Analog Modulator

AN2199 explains the construction of a high resolution DAC using a 16-bit PWM, a switched capacitor block, and the analog modulator function.

Introduction

PSoC® Designer already has DAC6, DAC8 and DAC9 User Modules. Any resolution beyond this is not possible using the existing topology. This Application Note discusses a method of using a 16-bit PWM, an SCBLOCK, and the analog modulator function to construct a higher resolution DAC. The example project has a 12-bit DAC incorporated. Theoretically, a 16 bit DAC can be designed using this technique. But the repeatability and effect of noise have to be studied for such high resolutions.