TAS3103 datasheet(111/146 Pages) TI

111 / 146 page

3−51

0.0625

0.25

0.375

−2W

Output

0.25

0.5

Output

−W

Triangular Distribution

Quadratic Distribution

Bit

Sample

Bit

Sample

Bit

Sample

Bit

Sample

Bit

Sample

8-Bit

Headroom

8-Bit

Resolution

Band

16-Bit

Output SAP

Word Size

32-Bit

Output SAP

Word Size

48-Bit DAP

Data Word

−W

Figure 3−30. Dither Data Magnitude (Gain = 1.0)

3.9.4

Dither Statistics

Figure 3−31 presents plots of the autocorrelation and channel-to-channel correlation properties of the dither data

stream when configured as triangular distributed noise. Figure 3−31(a) is the circular autocorrelation of 16K samples

of dither data collected from the TAS3103. The audio signal level was set to zero, and the dither data stream was

inserted at the LSB of the output word. The autocorrelation contains a single line of value 8000, at the point of

correlation, and random noise terms of approximately

±150 counts in value. The value 8000 agrees with the selection

of the triangular distribution—50% of the 16K dither output samples are of value

±1. Figure 3−31(b) is the circular

correlation of 16K samples of dither data from CH1 and 16K samples of dither data from CH2. There are no points

of correlation in this plot, verifying that the two data streams are uncorrelated. The random noise terms are again

approximately

±150 counts in value

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