GATE (Graduate Aptitude Test in Engineering) Electronics & CE (EC) Digital Circuits-Data Converters Study Material (Page 2 of 3)

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DAC Introduction and Types

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Introduction

A D/A converter take digital data at its input and convert them into analogue voltage or current that is proportional to the weighted sum of digital inputs. In the following paragraphs it is briefly explained how different bits in the digital input data contribute a different quantum to the overall output analogue voltage or current, and that the LSB has the least and the MSB the highest weight.

Simple Resistive Divider Network for D/A Conversion

For the conversion of digital signal in to corresponding analog signal we must change the n digital voltage …

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Binary Weighted Method of DAC

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Since binary numbers represent digital words, individual bits have binary weights depending on their position within the digital word. A simple summing amplifier can be used to convert a digital word to its analogue value, by arranging for each bit to contribute a current equal to its binary weight. This principle is used in binary weighted DACs in two different implementations. In the first implementation, the resistor values increase by a factor of two as the bit becomes less significant. The circuit of a binary-weighted resistor DAC is illustrated in Figure. When the value of the digital bits is at logic 1, the current through the binary-weighted resistance is diverted to flow through the feedback resist…

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