TAS3103DBT datasheet(78/146 Pages) TI

78 / 146 page

3−18

Microprocessor

2048 Sample

Transition

4096 Sample

Transition

Soft Volume

Gain Control

Soft Volume

volume_setting

VSCSubaddress 0xF1 = 1

VSCSubaddress 0xF1 = 0

I2C Slave Mode

I2C Master Mode

I2C

Volume

Commands

GPIO

Volume

Commands

f (Volume)

Programmable

Biquad Filter

Channel-Processed

Audio

Loudness Compensation

Volume-Adjusted

Audio

Figure 3−15. Soft Volume and Loudness Compensation Block Diagram

Figure 3−15 is a more detailed block diagram of soft volume and loudness compensation, and includes the I2C

subaddress commands that control volume and loudness compensation. Volume control is accomplished using three

I2C subaddresses—volume control, mute/unmute control, and volume slew rate control.

Volume control in the TAS3103 applies a linear gain. The volume commands issued via I2C subaddresses 0xF2,

0xF3, and 0xF4 (monaural channels 1, 2, and 3 respectively) are signed 5.23 format numbers. These commands are

applied to mixers, whose other input port is the audio data stream. The mixer output is the product of the audio data

stream and the volume command. Examples of volume command settings are given below.

Volume Command = 0x3580B07 = 0011_0.101_1000_0000_1011_0000_0111 = 6.6878365

Volume Command = 0x01F0000 = 0000_0.001_1111_0000_0000_0000_0000_0000 = 0.2421875

Volume Command = 0xCD6EFFE = 1100_1.101_0110_1110_1111_1111_1110 = −6.3208010

The volume control range is 0 = −

∞ to 2−23 = −138.47 dB to 24 − 2−23 = 24.08 dB. Volume control is achieved by means

of a 5.23 format gain coefficient that is applied to a linear mixer. The volume gain setting realized, for a given volume

gain coefficient is:

Gain = 20log (Volume_Gain_Coefficient)

TAS3103DBT Datasheet(PDF) 78 Page - Texas Instruments

TAS3103DBT Datasheet(HTML) 78 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 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL