參數(shù)資料
型號： TAS3004PFB
廠商： TEXAS INSTRUMENTS INC
元件分類： 消費(fèi)家電
英文描述： SPECIALTY CONSUMER CIRCUIT, PQFP48
封裝： GREEN, PLASTIC, TQFP-48
文件頁數(shù)： 24/84頁
文件大小： 671K
代理商： TAS3004PFB
4–1
4 Audio Control/Enhancement Functions
4.1
Soft Volume Update
The TAS3004 device implements a TI proprietary soft volume update. This feature allows a smooth and
pleasant-sounding change from one volume level to another over the entire range of volume control (18 dB to mute).
The volume is adjustable by downloading a 4.16 gain coefficient through the I2C interface. Table A–5 lists the 4.16
coefficients converted into dB for the range of –70 dB to 18 dB with 0.5-dB step resolution.
Right and left channel volumes can be unganged and set to different values. This feature implements a balance
control.
Volume is changed by writing the desired value into the volume control registers. This is done by asserting the GPI
terminals for volume-up or volume-down for a limited range of volume control. Alternately, volume control settings
can be sent to the TAS3004 device over the I2C bus.
4.2
Software Soft Mute
Mute is implemented by loading all zeros in the volume control register. This causes the volume to ramp down over
a duration of 2048fS samples to a final output of 0 (– infinity dB).
Soft mute can be enabled by either asserting the mute GPI terminal or sending a mute command over the I2C bus.
4.3
Input Mixer Control
The TAS3004 device is capable of mixing and multiplexing three channels of serial audio data. The mixing is
controlled through three mixer control registers. This is accomplished by loading values into the corresponding bytes
of the mixer left gain (07h) and mixer right gain (08h) control registers.
The values loaded into these registers are in 4.20 format—4 bits for the integer and 20 bits for the fractional part.
Table A–8 lists the 4.20 numbers converted into dB for the range of –70 dB to 18 dB, although any positive 4.20
number may be used.
To mute any of the channels, 0s are loaded into the respective mixer control register.
Mixer controls are updated instantly and can cause audible artifacts for large changes in setting when updated
dynamically outside of the fast load mode; therefore, it is desirable to use fast load in conjunction with the soft-volume
mode.
SDIN1, SDIN2, and the ADC output can be mixed with a user-selectable gain for each channel. The gain control
registers are represented in 4.20 format.
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