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| Digital to Analog Converters (D/A) Posted: 22 Jun 2011 02:24 AM PDT A D/A Converter is used when the binary output from a digital system is to be converted into its equivalent analog voltage or current. The binary output will be a sequence of 1′s and 0′s. Thus they ma be difficult to follow. But, a D/A converter help the user to interpret easily. Basically, a D/A converter have an op-amp. It can be classified into 2 types. They are 1. Digital to Analog Converter using Binary-Weighted Resistors A D/A converter using binary-weighted resistors is shown in the figure below. In the circuit, the op-amp is connected in the inverting mode. The op-amp can also be connected in the non-inverting mode. The circuit diagram represents a 4-digit converter. Thus, the number of binary inputs is four. We know that, a 4-bit converter will have 24 = 16 combinations of output. Thus, a corresponding 16 outputs of analog will also be present for the binary inputs. Four switches from b0 to b3 are available to simulate the binary inputs: in practice, a 4-bit binary counter such as a 7493 can also be used. Working The circuit is basically working as a current to voltage converter. b0 is closed It will be... |
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