DAC is a digital-to-analog converter, which converts digital quantity into analog quantity. D/A converter is basically composed of four parts, namely, weighted resistor network, operational amplifier, reference power supply and analog switch. Analog-to-digital converters are generally used in analog-to-digital converters. Analog-to-digital converter is an analog-to-digital converter, which is a device that converts continuous analog signals into discrete digital signals.

First, the resolution of the DAC,

Refers to the ratio of the minimum output voltage (only the least significant bit corresponding to the input digital quantity is "1") to the maximum output voltage (all significant bits corresponding to the input digital quantity are "1"). For example, an N-bit D/A converter has a resolution of1(2n-1). In practical use, the method of expressing resolution is also expressed by the number of digits of the input digital quantity.

Second, the accuracy of DAC,

The accuracy of DAC is the conversion accuracy, and the conversion accuracy of D/A converter is related to the integrated chip structure and interface circuit configuration of D/A converter. If other D/A conversion errors are not considered, the conversion accuracy of D/A is the resolution. Therefore, in order to obtain high-precision D/A conversion results, we must first ensure that we choose a D/A converter with sufficient resolution.

At the same time, the accuracy of D/A conversion is also related to the configuration of external circuits. When the external circuit device or power supply has a large error, it will cause a large D/A conversion error. When these errors exceed a certain level, digital-to-analog conversion will produce errors.

Extended data:

Operating temperature range of DAC:

1. Generally speaking, the main environment and working conditions that affect the accuracy of digital-to-analog conversion are temperature and power supply voltage changes. Because the working temperature will affect the weighted resistance network of the operational amplifier, the rated accuracy index can only be guaranteed within a certain working range.

2. The working temperature range of a good DAC converter is between -40℃ and 85℃, and that of a poor DAC converter is between 0℃ and 70℃. The static and dynamic indexes of most devices are measured at the working temperature of 25℃, and the influence of working temperature on various accuracy indexes is described by temperature coefficient, such as offset temperature coefficient, gain temperature coefficient, differential linear error temperature coefficient and so on.

Baidu Encyclopedia-D/A Converter