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 [00000000], Vref= 10V
V0= 0 Volts.
2. If data is 80H [10000000], 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
