The resolution or precision of such a D/A converter is defined as the smallest output increment possible, divided by the difference between the maximum and minimum output values. Alternative design of simple binary weighted resistor network used as a D/A converter Alternatively, there are some bipolar D/A converters available commercially.įigure 10.5.
If the output is required to be bipolar, that is, the numerical input may have either positive or negative polarity to produce either positive or negative output voltages or currents, then this may be most easily handled by two separate converters, one for each of the output polarities and only one of which is allowed to be active at any one time. If the digital input is in some other numerical format, it can be converted to base 2 as described elsewhere in this text. Here it will be assumed that the digital input is a conventional positive base 2 integer. The D/A converter (or DAC) gives a controlled analogue output voltage or, in certain specialist applications, a controlled analogue output current or another circuit parameter such as resistance, whose value corresponds to an input digital word.
WOODS MA, DPhil, in Digital Logic Design (Fourth Edition), 2002 10.4 Digital-to-analogue conversionĭigital-to-analogue conversion (abbreviated to D/A, D-A, or D-to-A conversion) is frequently required in a digital system used to control some external analogue circuitry.
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