Advantech PCIE-1816 - Analog Input Operation; AI Hardware Structure

PCIE-1816_1816H User Manual 38
B.1 Analog Input Operation
This section describes the following features of analog input that can help you realize
how to configure the functions and parameters to match various applications.
 AI Hardware Structure
 Analog input ranges and gains
 Analog data acquisition mechanism
 Analog input acquisition modes
 AI SCAN/CONV clock source
 AI trigger sources
 Analog input data format
B.1.1 AI Hardware Structure
The AI conversion hardware structure includes four major parts:
 Auto-scan multiplexer routes the analog input signals into AI converter chan-
nel by channel in a software-defined sequence.
 PGIA (Programmable Gain Instrument Amplifier) rectifies the input range and
amplify/alleviate input signal to match the input range of A/ D converter.
 AI converter conceives the rectified voltage from PGIA and transfers it into the
corresponding digital data format.
 Trigger/Clock control logic enables/disables the whole process and deter-
mines acquisition timing interval.