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TDATA is the digital signal input and determines the output frequency and amplitude. TDATA is encoded as a 1s density bitstream where the DAC1280 output is proportional to the 1s density. When the 1s density input is 75% (that is, on average, three out of four TDATA bits are '1'), the differential output current is at a positive maximum value; when the 1s density input is at 25% (on average, three out of four TDATA bits are '0'), the differential output current is at a negative maximum value. When the 1s density is 50% (on average, an equal number of '1's and '0's), the differential output current is 0. See Table 1.
