TAS5548DCAR datasheet(33/116 Pages) TI1

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Coefficient

Digit 8

Coefficient

Digit 7

Coefficient

Digit 6

Coefficient

Digit 5

Coefficient

Digit 4

Coefficient

Digit 3

Coefficient

Digit 2

Coefficient

Digit 1

Fraction

Digit 5

Sign

Bit

Fraction

Digit 6

Fraction

Digit 4

Fraction

Digit 3

Fraction

Digit 2

Fraction

Digit 1

Integer

Digit 1

u = unused or don’t care bits

Digit = hexadecimal digit

M0009-01

(1 or 0)

23 + (1 or 0)

22 + … + (1 or 0)

20 + (1 or 0)

2−1 + … + (1 or 0)

2−4 + … + (1 or 0)

2−23

23 Bit

22 Bit

20 Bit

2−1 Bit

2−4 Bit

2−23 Bit

M0008-01

TAS5548

www.ti.com

SLES270A – NOVEMBER 2012 – REVISED APRIL 2015

Figure 29. Conversion Weighting Factors—5.23 Format to Floating Point

Gain coefficients, entered via the I2C bus, must be entered as 32-bit binary numbers. The format of the 32-bit

number (4-byte or 8-digit hexadecimal number) is shown in Figure 30.

Figure 30. Alignment of 5.23 Coefficient in 32-Bit I2C Word

As Figure 30 shows, the hexadecimal (hex) value of the integer part of the gain coefficient cannot be

concatenated with the hex value of the fractional part of the gain coefficient to form the 32-bit I2C coefficient. The

reason is that the 28-bit coefficient contains 5 bits of integer, and thus the integer part of the coefficient occupies

all of one hex digit and the most significant bit of the second hex digit. In the same way, the fractional part

occupies the lower three bits of the second hex digit, and then occupies the other five hex digits (with the eighth

digit being the zero-valued most significant hex digit).

7.4.10.3 TAS5548 Audio Processing

The TAS5548 digital audio processing is designed so that noise produced by filter operations is maintained

below the smallest signal amplitude of interest, as shown in Figure 31. The device achieves this low noise level

by increasing the precision of the signal representation substantially above the number of bits that are absolutely

necessary to represent the input signal.

Similarly, the TAS5548 carries additional precision in the form of overflow bits to permit the value of intermediate

calculations to exceed the input precision without clipping. The TAS5548's advanced digital audio processor

achieves both of these important performance capabilities by using a high-performance digital audio-processing

architecture with a 32-bit data path, 28-bit filter coefficients, and a 60-bit accumulator.

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