參數(shù)資料
型號: TAS3103IDBTRG4
廠商: TEXAS INSTRUMENTS INC
元件分類: 消費家電
英文描述: SPECIALTY CONSUMER CIRCUIT, PDSO38
封裝: GREEN, PLASTIC, TSSOP-38
文件頁數(shù): 124/148頁
文件大小: 1247K
代理商: TAS3103IDBTRG4
318
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 315. Soft Volume and Loudness Compensation Block Diagram
Figure 315 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 223 = 138.47 dB to 24 223 = 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)
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