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Design of ADC/DAC card and Interfacing With 8085 Microprocessor

Submitted By:
Pulkit Jain
Prateek Bhansali
Rocky Gupta

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Abstract:
In this project we attempt to design a simple ADC/DAC card which can be easily interfaced with 8085 microprocessor kit for Data Acquisition(DAQ) purposes. We extent our work by designing a pcb

APPLICATION:
Commerical ADC/DAC cards can cost hundreds of dollars, not viable for teaching purposes. This ADC/DAC card, which is much cheaper can be used for various purposes such as to obtain the characteristics of various devices like BJT, diode, MOSFET, inverter .It can be used with various kinds of transducers and sensors in undergraduate l

Interfacing of ADC7574 with microprocessor
We used AD7574 which is a successive approximation 8-bit ADC. Since ADC does not have the START-CONV pin so by doing a dummy write generating a CS bar, but keeping RD bar high starts the conversion. The conversion time with R=184K and C=100pf,the conversion time is 20 microsec We provide sufficient delay between C S bar and RD bar