TAS3103ADBT datasheet(82/154 Pages) TI2

82 / 154 page

3−19

TAS3103A, volume commands received for the other two monaural channels are not acted on until the active volume

transition completes. When the active volume transition does complete, the latest volume command received for the

three monaural channels during the previous soft volume transition time are serviced. LRCLK should not be stopped

during a volume transition.

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 3−16. 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 TAS3103A 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 follow.

Volume command = 0x3580 B07 = 0011 0.101 1000 0000 1011 0000 0111 = 6.6878365

Volume command = 0x01F0 000 = 0000 0.001 1111 0000 0000 0000 0000 = 0.2421875

Volume command = 0xCD6E FFE = 1100 1.101 0110 1110 1111 1111 1110 = −6.3208010

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