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參數(shù)資料
| 型號： | TAS5508PAG |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 消費(fèi)家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP64 |
| 封裝： | GREEN, PLASTIC, TQFP-64 |
| 文件頁數(shù)： | 45/105頁 |
| 文件大?。?/td> | 1286K |
| 代理商： | TAS5508PAG |
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TAS5508
8-Channel Digital Audio PWM Processor
SLES091D – FEBRUARY 2004 – REVISED JULY 2009
www.ti.com
Because RESET is an asynchronous signal, clicks and pops produced during the application (the leading
edge) of RESET cannot be avoided. However, the transition from the hard mute state (M) to the
operational state is performed using a quiet start-up sequence to minimize noise. This control uses the
PWM reset and unmute sequence to shut down and start up the PWM. A detailed description of these
sequences is contained in the PWM section. If a completely quiet reset or power-down sequence is
desired, MUTE should be applied before applying RESET.
The rising edge of the reset pulse begins device initialization before the transition to the operational mode.
During device initialization, all controls are reset to their initial states. Table 3-2 shows the default control
settings following a reset.
Table 3-2. Values Set During Reset
CONTROL
SETTING
Clock register
Not valid
High pass
Disabled
Unmute from clock error
Hard unmute
PSVC Hi-Z
Disabled
Post DAP detection automute
Enabled
Eight Ch PreDAP detection automute
Enabled
De-emphasis
De-emphasis disabled
Channel configuration control
Configured for the default setting
Headphone configuration control
Configured for the default setting
Serial data interface format
I2S 24 bit
Individual channel mute
No channels are muted
Automute delay
5 ms
Automute threshold 1
< 8 bits
Automute threshold 2
Same as automute threshold 1
Modulation limit
Maximum modulation limit of 97.7%
Six- (or eight – low) channel configuration
Eight channels
Slew rate limit
Disengaged for all channels
Interchannel delay
–32, 0, –16, 16, –24, 8, –8, –24
Shutdown PWM on error
Enabled
Volume and mute update rate
Volume ramp 85 ms
Treble and bass slew rate
Update every 1.31 ms
Bank switching
Manual bank selection is enabled
Auto bank switching map
All channels use bank 1
Biquad coefficients (5508)
Set to all pass
Input mixer coefficients
Input N -> Channel N, no attenuation
Output mixer coefficients
Channel N -> Output N, no attenuation
Subwoofer sum into Ch1 and Ch2 (5508)
Gain of 0
Ch1 and Ch2 sum in subwoofer (5508)
Gain of 0
Bass and treble bypass
Gain of 1
Bass and treble inline
Gain of 0
DRC bypass (5508)
Gain of 1
DRC inline (5508)
Gain of 0
DRC (5508)
DRC disabled, default values
Master volume
Mute
Individual channel volumes
0 dB
All bass and treble Indexes
0x12 neutral
Treble filter sets
Filter set 3
TAS5508 Controls and Status
44
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