Simple Analog to Digital Converter (ADC)


Posted on Feb 4, 2014

Normally analogue-to-digital con-verter (ADC) needs interfacing through a chip to catechumen alternation abstracts into agenda format. This requires accouterments and all-important software, consistent in added complication and appropriately the absolute cost. The ambit of A-to-D advocate apparent actuality is configured about ADC 0808, alienated


Simple Analog to Digital Converter (ADC)
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the use of a microprocessor. The ADC 0808 is an 8-bit A-to-D converter, accepting abstracts curve D0-D7. It works on the assumption of alternating approximation. It has a absolute of eight alternation ascribe channels, out of which any one can be called application abode curve A, B and C. Here, in this case, ascribe approach IN0 is called by accomplishments A, B and C abode lines. Usually the ascendancy signals EOC (end of conversion), SC (start conversion), ALE (address latch enable) and OE (output enable) are interfaced by agency of a microprocessor. However, the ambit apparent actuality is congenital to accomplish in its affiliated approach afterwards application any microprocessor. Therefore the ascribe ascendancy signals ALE and OE, actuality active-high, are angry to Vcc (+5 volts). The ascribe ascendancy arresting SC, actuality active-low, initiates alpha of about-face at falling bend of the pulse, admitting the achievement arresting EOC becomes aerial afterwards achievement of digitisation. This EOC achievement is accompanying to SC input, area falling bend of EOC achievement acts as SC ascribe to absolute the ADC to alpha the conversion. As the about-face starts, EOC arresting goes high. At abutting alarm beating EOC achievement afresh goes low, and appropriately SC is enabled to alpha the abutting conversion. Thus, it provides affiliated 8-bit agenda achievement agnate to direct amount of alternation input. The...




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