Multichannel Sampling Circuit

Published:2011/6/15 8:46:00 Author:Michel | Keyword: Multichannel, Sampling Circuit | From:SeekIC

Multichannel Sampling Circuit The picture is a practical example of multichannel sampling circuit.It consists of 16 channel analog switch, AD7506 type chip, sampling keeping circuit LF398 and AD converter, ADC-0808 and it connects with 1 / O interface chip INTEL8255 parallel port.PA0 ~ PA7 and ADC0808 data is linked together, which is used for data input.PB0 ~ PB4 is channel selection signal which controls the input channel choice.PB5 is the keeping signal, PB6 sampling is the starting signal of A/D converter conversion.PC0 is the end signal input port of A/D converter which is judged by CPU read.Multichannel sampling circuit's work is controlled by corresponding program completely.This circuit has the following kinds of work entirely controlled by the corresponding programs and it has following work ways. First,sampling in order.It scans sampling aacording to channel sequence.Second,fixed-point sampling.It samples to one fixed channel.Third,setting sampling interval.If the actual measured input signal is less than channel numbers of sampling system , the sampling interval can be narrowed.



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