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Define Voltage Source Multiplying DAC?
Voltage source multiplying DACs use a reference voltage which is switched in or out by the digital data. The converter is so-named because it multiplies a certain gain value with a source voltage (Vcc in this case).
Let us consider a 2-bit example. To transform 10 to analog, resistance R is switched in by digital control logic, and the resistor 2R is grounded. The achievement of the circuit is R1/R that can be adjusted to an appropriate value.
For the sake of the example, let R1 = R. The overall gain of the circuit would then be unity, which would give an output of Vcc. The common conversion equation for this circuit is as follow:
VO = - [Vin * (R1 / R) + Vin * (R1 / 2R)]
A 2-bit conversion table would be like this:
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