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參數資料
| 型號： | TS4984EIKJT |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 1.2 W, 2 CHANNEL, AUDIO AMPLIFIER, PBGA15 |
| 封裝： | LEAD FREE, FCP-15 |
| 文件頁數： | 16/30頁 |
| 文件大小： | 1644K |
| 代理商： | TS4984EIKJT |
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TS4984FC
Application Information
23/30
4.8
Pop performance
Pop performance is intimately linked with the size of the input capacitor Cin and the bias voltage
bypass capacitor Cb.
The size of Cin is dependent on the lower cut-off frequency and PSRR values requested. The
size of Cb is dependent on THD+N and PSRR values requested at lower frequencies.
Moreover, Cb determines the speed with which the amplifier turns ON. In order to reach near
zero pop and click, the equivalent input constant time,
τin =(Rin +2k)xCin (s) with Rin ≥ 5k
must not reach the
By following the previous rules, the TS4984 can reach near zero pop and click even with high
gains such as 20dB.
Example calculation:
With Rin =22k and a 20Hz, -3dB lower cut-off frequency, Cin = 361nF.
So, Cin =390nF with standard value which gives a lower cut-off frequency equal to 18.5Hz.
In this case, (Rin +2k)x Cin =9.36ms.
When referring to the previous graph, if Cb =1F and VCC = 5V, we read 20 ms max.
This value is twice as high as our current value, thus we can state that pop and click will be
reduced to its lowest value. Minimizing both Cin and the gain benefits both the pop phenomena,
and the cost and size of the application.
Figure 66.
τin max. versus bypass capacitor
12
34
0
40
80
120
160
Vcc=5V
Vcc=3.3V
Vcc=2.6V
Tamb=25
°C
in
m
ax.
(m
s)
Bypass Capacitor Cb ( F)
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相關代理商/技術參數 |
參數描述 |
|---|---|
| TS4984FC | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:1.2W Stereo Audio Power Amplifier with Active Low Standby Mode |
| TS4984IQT | 功能描述:音頻放大器 2x1W stereo audio Pwr amp RoHS:否 制造商:STMicroelectronics 產品: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: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| TS4985 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:2x1.2w Stereo Audio Power Amplifier with Dedicated Standby Pins |
| TS4985EIJT | 功能描述:音頻放大器 2x1.2W stereo audio RoHS:否 制造商:STMicroelectronics 產品: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: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| TS4985EIKJT | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:2x1.2w Stereo Audio Power Amplifier with Dedicated Standby Pins |
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