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參數(shù)資料
| 型號： | TPA6030A4PWPRG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 音頻控制 |
| 英文描述： | 2 CHANNEL(S), VOLUME CONTROL CIRCUIT, PDSO28 |
| 封裝： | GREEN, PLASTIC, TSSOP-28 |
| 文件頁數(shù)： | 9/32頁 |
| 文件大?。?/td> | 698K |
| 代理商： | TPA6030A4PWPRG4 |
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TPA6030A4
SLOS395B DECEMBER 2002 REVISED JANUARY 2005
www.ti.com
17
The effect of the resistor dividers can be observed when the output is switched from speaker to headphone mode. If the
voltage on the volume pin is greater than 85% of 5VREF, the resistor divider network around SEMAX limits the headphone
volume to 7.2 dB. If the voltage on the VOLUME pin falls below 85% of 5VREF, SEDIFF limits the headphone volume to
13.6 dB less than the speaker volume. To convert a percentage of 5VREF to volume in dB, refer to the column in Table
1 labeled %5VREF, and find the corresponding speaker volume. That value can then be substituted into the following
equations for VOLUME, SEDIFF, or SEMAX. It is important, however, to find the minimum based on the %5VREF before
converting to dB.
SE Volume + min (VOLUME * SEDIFF) or (SEMAX) *6dB
When the voltage on the VOLUME pin is > 85% of 5VREF, or at 90% of 5VREF for example, the headphone volume is
determined by the following equation:
SE Volume + min (90%5VREF * 18%5VREF) or (67%5VREF) *6dB +
67%5VREF * 6dB + 13.2 dB*6dB + 7.2 dB
When the voltage on the VOLUME pin is < 85% of 5VREF, or at 50% of 5VREF for example, the headphone volume is
determined by the following equation:
32%5VREF*6dB +*19.73 dB*6dB +*25.73 dB
SE volume + min (50%5VREF * 18%5VREF) or (67%5VREF) *6dB +
When the voltage on the VOLUME pin = 85% of 5VREF, both SEMAX and SEDIFF have the same affect on the headphone
volume.
67%5VREF*6dB + 13.2 dB*6dB + 7.2 dB
SE Volume + min (85%5VREF * 18%5VREF) or (67%5VREF) *6dB +
–46 dB is the lowest the SE volume can go without going into mute. So, for example, if the end calculation for the SE volume
was –50 dB, the actual volume would be mute.
It is important to note that the evaluation module (EVM) for the TPA6030A4, SLOP365, does not have fixed resistors for
setting the voltages on the VOLUME, SEDIFF, and SEMAX pins. It has potentiometers in place of the resistor divider
networks for added flexibility. Potentiometers may be used in an application as well.
Another method of controlling the voltage on the SEDIFF and SEMAX pins would be to apply the voltage with an external
controller, using 5VREF as a reference voltage.
Input Capacitor, CI
The input capacitor allows the amplifier to bias the input signal to the proper dc level for proper operation. In this case, the
input capacitor, CI, and the input impedance of the amplifier, RI, form a high-pass filter with the corner frequency determined
in equation 6. Figure 23 shows how the input capacitor and the input resistor within the amplifier interact.
Rf
RI
CI
Input Signal
IN
Figure 23. Input Resistor and Input Capacitor
(2)
(3)
(4)
(5)
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| TPA6040A4 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:2-W STEREO AUDIO POWER AMPLIFIER WITH DirectPath STEREO HEADPHONE DRIVE AND REGULATOR |
| TPA6040A4EVM | 功能描述:音頻 IC 開發(fā)工具 TPA6040A4 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 |
| TPA6040A4RHB | 制造商:TI 制造商全稱:Texas Instruments 功能描述:2-W STEREO AUDIO POWER AMPLIFIER WITH DirectPath STEREO HEADPHONE DRIVE AND REGULATOR |
| TPA6040A4RHBR | 功能描述:音頻放大器 2W Stereo Aud Pwr RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| TPA6040A4RHBRG4 | 功能描述:音頻放大器 2W St Aud Pwr Amp RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
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