TAS5721 datasheet(37/78 Pages) TI1

37 / 78 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

TAS5721

www.ti.com

SLOS739A – JULY 2012 – REVISED MARCH 2016

Product Folder Links: TAS5721

Submit Documentation Feedback

Programming (continued)

9.5.1.1 I2C Device Address Change Procedure

•

Write to device address change enable register, 0xF8 with a value of 0xF9 A5 A5 A5.

•

Write to device register 0xF9 with a value of 0x0000 00XX, where XX is the new address.

•

Any writes after that should use the new device address XX.

9.5.2 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 decimal point and 23 bits to the right of the decimal point.

This is shown in Figure 68.

Figure 68. 3.23 Format

The decimal value of a 3.23 format number can be found by following the weighting shown in Figure 68. 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 69 applied to obtain the magnitude

of the negative number.

Figure 69. 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 70.

TAS5721 Datasheet(PDF) 37 Page - Texas Instruments

TAS5721 Datasheet(HTML) 37 Page - Texas Instruments

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78

Datasheet Download

Link URL