Analog To Digital Converter

digital converter is a high speed 12-bit converter. It has a front end multiplexer capable of accepting signal from any one of 8 channels. An additional channel (not connected externally) accepts output from an internal solid state temperature sensor. Unfortunately, the present device does not incorporate any programmable gain amplifier, which would have added to its functionality in industrial measurement & control applications.The analog to digital converter has a very flexible mode of operation. Its operation can be controlled by any one of the following:Continuous conversion on a channelThrough user program (software)Through internal Timer2Through external trigger on pin 23.Through DMA (continuous conversion mode)DMA based conversion is a high speed operation. It can perform continuous conversion on the selected channels (in sequential order) and automatically store the conversion results in an external SRAM and all this is carried out without any intervention from microcontroller. The microcontroller can continue to function, while DMA conversion is taking place. Up to 16M Bytes of external SRAM memory can be addressed. It is also possible to set up ADC for performing continuous conversion on a selected channel and store the result in its internal registers. This mode of operation is certainly useful in digital process control.