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參數(shù)資料
| 型號： | TAS5504PAGRG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 消費家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP64 |
| 封裝： | GREEN, PLASTIC, TQFP-64 |
| 文件頁數(shù)： | 31/96頁 |
| 文件大?。?/td> | 1216K |
| 代理商： | TAS5504PAGRG4 |
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Introduction
29
SLES123 October 2004
TAS5504
THD < 0.01%
Adjustable maximum modulation limit of 93.8% to 99.2%
3.3-V digital signal
1.12.1
DC Blocking (High Pass Enable/ Disable)
Each input channel incorporates a first order digital high-pass filter to block potential dc components. The filter
–3 dB point is approximately 0.89-Hz at 44.1-kHz sampling rate. The high-pass filter can be enabled and
disabled via the I2C interface.
1.12.2
De-Emphasis Filter
For audio sources that have been pre-emphasized, a precision 50 s/15 s de-emphasis filter is provided to
support the sampling rates of 32 kHz, 44.1 kHz, and 48 kHz. Figure 121 shows a graph of the de-emphasis
filtering characteristics. De-emphasis is set using two bits in the system control register.
Response
dB
10
0
Frequency kHz
3.18 (50 s)
10.6 (15 s)
Figure 121. De-emphasis Filter Characteristics
1.12.3
Power Supply Volume Control (PSVC)
The TAS5504 supports volume control by both conventional digital gain / attenuation and by a combination
of digital and analog gain / attenuation. Varying the H-bridge power supply voltage performs the analog volume
control function. The benefits of using powers supply volume control (PSVC) are reduced idle channel noise,
improved signal resolution at low volumes, increased dynamic range, and reduced radio frequency emissions
at reduced power levels. The power supply volume control (PSVC) is enabled via I2C. When enabled the
PSCV provides a PWM output that is filtered to provide a reference voltage for the power supply. The power
supply adjustment range can be set for 12.04, 18.06, or 24.08 dB, to accommodate a range of variable
power supply designs.
Figure 122 and Figure 123 show how power supply and digital gains can be used together.
The volume biquad (0xCF) can be used to implement a low-pass filter in the digital volume control to match
the PSVC volume transfer function.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
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| TAS5508 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:8 Channel Digital Audio PWM Processor |
| TAS5508-5121K8EVM | 功能描述:音頻 IC 開發(fā)工具 TAS5508-TAS5121K8 Eval Mod RoHS:否 制造商:Texas Instruments 產(chǎn)品:Evaluation Kits 類型:Audio Amplifiers 工具用于評估:TAS5614L 工作電源電壓:12 V to 38 V |
| TAS5508-5122C6EVM | 功能描述:音頻 IC 開發(fā)工具 TAS5508-5122C6 Eval Mod RoHS:否 制造商:Texas Instruments 產(chǎn)品:Evaluation Kits 類型:Audio Amplifiers 工具用于評估:TAS5614L 工作電源電壓:12 V to 38 V |
| TAS5508-5142K7EVM | 功能描述:音頻 IC 開發(fā)工具 HI PERF MULTI PWM RoHS:否 制造商:Texas Instruments 產(chǎn)品:Evaluation Kits 類型:Audio Amplifiers 工具用于評估:TAS5614L 工作電源電壓:12 V to 38 V |
| TAS5508A | 制造商:TI 制造商全稱:Texas Instruments 功能描述:8 Channel Digital Audio PWM Processor |
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