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| 型号： | TAS5518PAGR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 消费家电 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP64 |
| 封装： | GREEN, PLASTIC, TQFP-64 |
| 文件页数： | 49/105页 |
| 文件大小： | 1514K |
| 代理商： | TAS5518PAGR |
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TAS5518 Controls and Status
40
SLES115 — August 2004
TAS5518
2.3.6 Volume and Mute Update Rate
The TAS5518 has fixed soft volume and mute ramp durations. The ramps are linear. The soft volume and mute
ramp rates are adjustable by programming the I2C register 0xD0 for the appropriate number of steps to be
512, 1024, or 2048. The update is performed at a fixed rate regardless of the sample rate.
In normal speed, the update rate is 1 step every 4 / Fs seconds.
In double speed, the update is 1 step every 8 / Fs seconds.
In quad speed, the update is 1 step every 16 / Fs seconds.
Because of processor loading, the update rate can increase for some increments by +1/Fs to +3/Fs. However,
the variance of the total time to go from +18 dB to mute is less than 25%.
Table 28. Volume Ramp Rates in ms
NUMBER OF STEPS
SAMPLE RATE (KHZ)
NUMBER OF STEPS
44.1, 88.2, 176.4
32, 48, 96, 192
512
46.44 ms
42.67 ms
1024
92.88 ms
85.33 ms
2048
185.76 ms
170.67 ms
2.3.7 Modulation Index Limit
PWM modulation is a linear function of the audio signal. When the audio signal is 0, the PWM modulation is
50%. When the audio signal increases towards full scale, the PWM modulation increases towards 100%. For
negative signals, the PWM modulations fall below 50% towards 0%.
However, there is a limit to the maximum modulation possible. During the off-time period, the power stage
connected to the TAS5518 output needs to get ready for he next on-time period. The maximum possible
modulation is then set by the power stage requirements. All Texas Instruments power stages needs maximum
modulation to be 97.7%. This is also the default setting of the TAS5518. Default settings can be changed in
the Modulation Index Register (0x16).
Note that no change should be made to this register when using Texas Instruments power stages.
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相关代理商/技术参数 |
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| TAS5518PAGRG4 | 功能描述:音频 DSP 8 Ch Digital Audio PWM Processor RoHS:否 制造商:Texas Instruments 工作电源电压: 电源电流: 工作温度范围: 安装风格: 封装 / 箱体: 封装:Tube |
| TAS5538 | 制造商:TI 制造商全称:Texas Instruments 功能描述:TAS5612L-TAS5614LDDVEVM |
| TAS5538DGG | 制造商:TI 制造商全称:Texas Instruments 功能描述:TAS5612L-TAS5614LDDVEVM |
| TAS5538DGGR | 制造商:Texas Instruments 功能描述:audio processor |
| TAS5548 | 制造商:TI 制造商全称:Texas Instruments 功能描述:8-Channel HD Compatible Audio Processor with ASRC and PWM Output |
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