# Implementation of D/A Converter

Experiment No.: 6(A)

Experiment Name:

Implementation of Digital to Analog converter using trainer kit.

Objective:

To design and study the digital to analog converter.

Theory:

A digital-to-analog converter (DAC or D-to-A) is a device that converts a digital (usually binary) code to an analog signal (current, voltage, or electric charge). A typical DAC converts the abstract numbers into a concrete sequence of impulses that are then processed by a reconstruction filter using some form of interpolation to fill in data between the impulses.

There are two types D/A converter

1. Weighted resistor D/A converter
2. D/A converter with ladder N/W.
1. WEIGHTED D/A CONVERTER:- The binary weighted resistor DAC uses an op- amp to sum n binary weighted currents from a reference voltage VR via current scaling resistor 2R, 4R, 8R, ……2nR. A weighted resistor DAC requires a wide range of resistor values for better resolution whereas a R-2R ladder type DAC requires only two values of resistor .
2. D/A CONVERTER WITH LADDER N/W:- In this type reference voltage is applied to one of the switch position , and other switch position is connected to ground .The number of bits can be expanded by adding more sections of same R/2R values.

Circuit Diagram:

Procedure: Functional verification of a weighted resistor D/A converter.

1. Make the connection as shown in circuit diagram.
2. Connect the power supply to the board.
3. Connect the logic switches to the corresponding jacks B0 – B3 of the converter.
4. Set the switches S0 – S3 to logic level 0.
5. Connect the Vref socket to +5 volts.
6. Connect a multimeter as voltmeter for DC, to the output Vo of the converter.
7. Switch the logic switches in binary progression & measure & record the output voltage in correspondence of every Combination of the input code.

Observation Table:

Apparatus Used:

Result:

The DA converter is studied & observations are recorded in observation tables.

Precaution:

All the connections should be right and made according to connection diagram. Switched on the power supply after checking the connections. Reading should be taken carefully consciously.

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