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How does an ADC convert a single ended signal to a differential?
Figure 1 shows the LT6350 being used to convert a 0V to 5V single-ended input signal to differential for an ADC with differential inputs. In this case, the first amplifier is configured as a unity gain buffer and the single-ended input signal directly drives the high-impedance input of the amplifier.
What is the voltage gain of a single-ended to differential amplifier?
Your single-ended to differential amplifier has a voltage gain of 1, so with 5Vpp input the differential output is 5Vpp. To get 5Vpp on each ADC input you need a voltage gain of 2, producing a differential output of 10Vpp. I would like a single supply system (5 V DC).
Is it necessary to max out the ADC input range?
Generally it is not necessary (or even desirable) to ‘max out’ the ADC input range. Using a 4.096V reference with a differential signal range of 5Vpp (rather than the theoretical maximum of 8.192Vpp) loses less than 1 bit of resolution.
Which is true of a differential a / D converter?
Before discussing biasing solutions, it is important to understand the functionality of differential A/D convert- ers. The true differential A/D converter outputs a digital representation of a differential input signal, typically a two’s complement binary formatted output.
Which is the typical representation of a single-ended ADC?
Single-ended ADC: Single-ended ADCs each have one input (not to be confused with input channels) that connects to the signal that needs to be converted to digital. The signal is referenced to either GND or some other fixed voltage reference. Figure 1 shows the typical representation of a single-ended ADC. Figure 1
What are the drawbacks of differential ADCs?
The only major drawback of differential input ADCs is the reduced number of input channels that can be implemented using a given number of pins. Because they use two pins per input, differential ADCs can have only half the number of channels compared to single-ended ADCs with same number of pins.