When the number of bits is large, the resistance value is very different, which makes it very difficult to ensure the accuracy, especially for the production of integrated circuits is very unfavorable, so the circuit is rarely used separately in integrated DACs. Its disadvantage is that the resistance value of each weighted resistor is different. The conversion accuracy of the weighted resistor network DAC depends on the reference voltage VREF, and the accuracy of the analog electronic switch, the operational amplifier, and the value of each weighted resistor. The current value is then summed by an operational amplifier and converted to a voltage value.ĭepending on the bit weighted network, different types of DACs can be formed, such as weighted resistor network DAC, R-2R inverted T-resistor network DAC, and single-value current network DAC. The digital-to-analog converter is composed of a digital register, an analog electronic switch, a decoding network, a summing operational amplifier, and a reference voltage source (or constant current source). An analog-to-digital converter, or A/D converter, or ADC, is a device that converts a continuous analog signal into a discrete digital signal. Analog-to-digital converters generally require the use of digital-to-analog converters. A D/A converter basically consists of four parts, namely a weighted resistor network, an operational amplifier, a reference power supply, and an analog switch. A digital-to-analog converter, also known as a D/A converter or DAC for short, is a device that converts a digital quantity into an analog quantity.
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