If more number of bits are present in the digital input, then we have to include required number of R-2R sections additionally.ĭue to the above advantages, R-2R Ladder DAC is preferable over binary weighted resistor DAC.Let’s learn about ADC in LPC2148 ARM7 Microcontroller. So, it is easy to select and design more accurate resistors.
R-2R Ladder DAC contains only two values of resistor: R and 2R. The advantages of a R-2R Ladder DAC are as follows − But, we can find the analog output voltage values of R-2R Ladder DAC for individual binary input combinations easily. It is difficult to get the generalized output voltage equation of a R-2R Ladder DAC. Let the 3-bit binary input is $b_$ when the corresponding input bits are equal to ‘1’. Recall that the bits of a binary number can have only one of the two values. The circuit diagram of a 3-bit binary weighted resistor DAC is shown in the following figure − In short, a binary weighted resistor DAC is called as weighted resistor DAC.
This section discusses about these two types of DACs in detail − Weighted Resistor DACĪ weighted resistor DAC produces an analog output, which is almost equal to the digital (binary) input by using binary weighted resistors in the inverting adder circuit. In general, the number of binary inputs of a DAC will be a power of two. The block diagram of DAC is shown in the following figure −Ī Digital to Analog Converter (DAC) consists of a number of binary inputs and a single output.
This chapter deals with Digital to Analog Converters in detail. The digital signal is represented with a binary code, which is a combination of bits 0 and 1. A Digital to Analog Converter (DAC) converts a digital input signal into an analog output signal.
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