Most of the real world applications require analog signals as inputs. The analog inputs can be from temperature, pressure, flow, level, sound, displacement etc from respective transducers after proper signal conditioning. The signals so conditioned need to be connected to a controller for data logging. In order to perform this task, varieties of analog to digital converters are available. The PIC controllers need specialized converters in terms of hardware. These are classified as 3,4 or 5-wire ADC data transmission interfaces.

The serial interface module offered is an 8 channel,12 bit ADC module. The maximum input for this is +4.8V DC only. This works on the principle of successive approximation. The conversion rate is approximately 6-10 uSec. This module has an additional precision reference level hardware to select quantization that is needed for precision logging. An external power supply 5V DC @250mA is required or +5V DC power supply Model SP5 is recommended.