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參數(shù)資料
| 型號： | TS4982IQT |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 2 W, 2 CHANNEL, AUDIO AMPLIFIER, QCC32 |
| 封裝： | 5 X 5 MM, ROHS COMPLIANT, QFN-32 |
| 文件頁數(shù)： | 15/31頁 |
| 文件大小： | 537K |
| 代理商： | TS4982IQT |
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Application information
TS4982
22/31
Doc ID 14527 Rev 2
4.8
Decoupling and charge pump capacitors
Only a power supply decoupling capacitor Cs and a bias voltage decoupling capacitor Cb
are needed to correctly decouple the TS4982.
4.8.1
Decoupling capacitors Cs and Cb
Cs has a particular influence on the THD+N in the high frequency region (above 7 kHz) and
an indirect influence on the power supply disturbances. With a value for Cs of 1 F, you can
expect similar THD+N performances to those outlined in this document (see Figure 12 to
Figure 23). For example:
●
In the high frequency region, if Cs is lower than 1 F, it increases THD+N and
disturbances on the power supply rail are less filtered.
●
On the other hand, if Cs is higher than 1 F, those disturbances on the power supply
rail are more filtered.
Cb has a critical influence on the final result of the PSRR with input grounded and in the
lower frequency region in the following manner:
●
If Cb is lower than 1 F the PSRR performance worsens at lower frequencies.
●
If Cb is higher than 1 F, the benefit to PSRR is decreased significantly.
Figure 43.
PSRR vs. frequency
100
1k
10k
-120
-100
-80
-60
-40
-20
0
Cb = 2.2
μF
Cb = 1
μF
Cb = 470nF
20k
20
PSR
R
(dB)
Frequency (Hz)
SPEAKER
V
CC
= PV
CCL,R
= 5V, Vripple = 200mV
PP
R
L ≥
4
Ω, Cin = 1μF, T
AMB
= 25
°C, Gain = 9dB
Inputs AC grounded
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TS4984 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:2 x 1W Stereo audio power amplifier with active low standby mode |
| TS4984EIJT | 功能描述:音頻放大器 2x1.2W stereo audio 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 |
| TS4984EIKJT | 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 |
| 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(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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