TAS5731MPHP datasheet(36/68 Pages) TI1

36 / 68 page

(1or0)

2 +

(1or0)

2 +(1or0)

+.......(1or0)

–1

–4

–23

2 Bit

Bit

–1

Bit

–4

Bit

–23

M0126-01

Bit

–23

S_xx.xxxx_xxxx_xxxx_xxxx_xxxx_xxx

Bit

–5

Bit

–1

2 Bit

SignBit

2 Bit

M0125-01

TAS5731M

SLOS838B – JULY 2013 – REVISED NOVEMBER 2013

www.ti.com

26-Bit 3.23 Number Format

All mixer gain coefficients are 26-bit coefficients using a 3.23 number format. Numbers formatted as 3.23

numbers means that there are 3 bits to the left of the binary point and 23 bits to the right of the binary point. This

is shown in Figure 62 .

Figure 62. 3.23 Format

The decimal value of a 3.23 format number can be found by following the weighting shown in Figure 62. If the

most significant bit is logic 0, the number is a positive number, and the weighting shown yields the correct

number. If the most significant bit is a logic 1, then the number is a negative number. In this case every bit must

be inverted, a 1 added to the result, and then the weighting shown in Figure 63 applied to obtain the magnitude

of the negative number.

Figure 63. Conversion Weighting Factors—3.23 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 64.

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