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參數(shù)資料
| 型號： | TS4851IJT |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 音頻控制 |
| 英文描述： | 2 CHANNEL(S), VOLUME CONTROL CIRCUIT, PBGA18 |
| 封裝： | FCP-18 |
| 文件頁數(shù)： | 16/28頁 |
| 文件大?。?/td> | 1280K |
| 代理商： | TS4851IJT |
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Application Information
TS4851
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5.6 Pop and Click performance
The TS4851 has internal Pop and Click reduction circuitry. The performance of this circuitry is closely
linked with the value of the input capacitor Cin and the bias voltage bypass capacitor Cb.
The value of Cin is due to the lower cut-off frequency value requested. The value of Cb is due to THD+N
and PSRR requested always in lower frequency.
The TS4851 is optimized to have a low pop and click in the typical schematic configuration (see page 2).
Note: The value of Cs is not an important consideration as regards pop and click.
5.7 Notes on PSRR measurement
What is the PSRR?
The PSRR is the Power Supply Rejection Ratio. The PSRR of a device, is the ratio between a power
supply disturbance and the result on the output. We can say that the PSRR is the ability of a device to
minimize the impact of power supply disturbances to the output.
How we measure the PSRR?
The PSSR was measured according to the schematic shown in Figure 61.
Figure 61: PSRR measurement schematic
Principles of operation
The DC voltage supply (Vcc) is fixed.
The AC sinusoidal ripple voltage (Vripple) is fixed.
No bypass capacitor Cs is used.
The PSRR value for each frequency is:
RMS is a rms selective measurement.
5.8 Power-On Reset
When Power is applied to Vdd, an internal Power On Reset holds the TS4851 in a reset state until the
Supply Voltage reached its nominal value.
The Power On reset has a typical threshold at 1.8V.
)
dB
(
RMS
Log
20
PSRR
)
Vripple
(
)
Output
(
×
=
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| TS4855 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:LOUDSPEAKER & HEADSET DRIVER WITH VOLUME CONTROL |
| TS4855_04 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:LOUDSPEAKER & HEADSET DRIVER WITH VOLUME CONTROL |
| TS4855EIJT | 功能描述:音頻放大器 Loudspeaker and headset driver 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 |
| TS4855IJT | 功能描述:音頻放大器 Low Power Audio 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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