The analog-to-digital converter provides the feedback signal to the processor. The original F240 device featured two 10-bit A/D converters running at 160 KSPS, each with an eight channel input multiplexer. In this way, up to sixteen feedback channels could be sampled in pairs, allowing, for example, two phase currents of a motor drive to be sampled simultaneously. In more recent devices such as the Delfino platform, the A/D converter takes the form of a single 12-bit converter running at up to 12 MSPS. This design features two sample and hold units which may be simultaneously triggered by events from the PWM generator. The Piccolo platform features a ratio-metric A/D converter, with it’s input range determined either by an internal reference, or by the differential voltage between two external pins. There are multiple analog comparators connected to some of the analog inputs, allowing over-voltage or over-current events to be detected and used to trip the PWM modules. Some devices feature digital filters at the comparator outputs which can eliminate the effects of spurious glitches in electrically noisy environments. The comparators also include programmable digital ramp generators which enable slope compensation in peak current mode control systems. The latest Piccolo devices feature integrated operation amplifiers and a programmable offset circuit, intended for use with current sense circuits in motor control and other power applications.