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Converting a Single-Ended Signal with the AD7984 Differential PulSAR ADC (cn0033)
There are many applications that require a single-ended analog signal, either bipolar or unipolar, to be converted by a high resolution, differential input ADC. This dc-coupled circuit converts a single-ended input signal to a differential signal suitable for driving the AD7984, an 18-bit, 1.33 MSPS member of the PulSAR family of ADCs. This circuit uses the ADA4941-1 single-ended-to-differential driver and the ADR435 ultralow noise 5.0 V voltage reference. The circuit can accept many types of single-ended input signals, including bipolar or unipolar, ranging from high voltage to low voltage. Direct coupling is maintained throughout. If board space is at a premium, all the ICs shown in Figure 1 come in small packages, either 3 mm × 3 mm LFCSP or 3 mm × 5 mm MSOP.
Figure 1: Single-Ended-to-Differential DC-Coupled Driver Circuit (Simplified Schematic)
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