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# Interfacing DAC(Digital to Analog Converter) with 8085

## Interfacing DAC (IC 0808) with 8255

• Follow the initial 3 steps of interfacing of 8255 with 8085 that are given before.

• The DAC 0808 is 8-bit digital to analog convertor IC. It converts digital data into equivalent analog current.

• Therefore I to V converter is used to convert analog output current of DAC to equivalent analog voltage.

• PA0-PA7 pins of Port A are connected to D0-D7 pins of DAC.

• In above DAC dual power supply of +/- 10V is applied with reference voltage 10V as shown in diagram.

• According to theory of DAC Equivalent analog output is given as:
• V0=Vref
Ex:
1. If data =00H , Vref= 10V
V0= 0 Volts.

2. If data is 80H , Vref= 10V V0=10
V0= 5 Volts.

• The control word format of 8255 for above interfacing is given as:

• =80H

## Program: ## Interfacing Diagram of DAC CACKLE comment system  