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參數資料
| 型號： | TS4975EIJT |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 音頻控制 |
| 英文描述： | 2 CHANNEL(S), VOLUME CONTROL CIRCUIT, PBGA12 |
| 封裝： | LEAD FREE, FLIP CHIP, 12 PIN |
| 文件頁數： | 22/36頁 |
| 文件大小： | 870K |
| 代理商： | TS4975EIJT |
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TS4975
Application Information
29/36
Output capacitor Cout
In single-ended mode the external output coupling capacitors Cout are needed. This coupling
capacitor Cout with the output load RL also forms a first-order high-pass filter with -3 dB cut off
frequency.
See
Figure 54 to establish the Cout value for a -3dB cut-off frequency required.
These two first-order filters form a second-order high-pass filter. The -3 dB cut-off frequency of
these two filters should be the same, so the following formula should be respected:
4.5
Decoupling of the circuit
Two capacitors are needed to properly bypass the TS4975 — a power supply capacitor Cs and
a bias voltage bypass capacitor Cb.
Cs has a strong influence on the THD+N in high frequency (above 7kHz) and indirectly on the
power supply disturbances.
With 1
F, you could expect similar THD+N performances like shown in the datasheet.
If Cs is lower than 1 F, THD+N increases in high frequency and disturbances on power supply
rail are less filtered.
To the contrary, if Cs is higher than 1 F, those disturbances an the power supply rail are more
filtered.
Cb has an influence on THD+N in lower frequency, but its value is critical on the final result of
PSRR with input grounded in lower frequency:
●
If Cb is lower than 1 F, THD+N increases at lower frequencies and the PSRR worsens
upwards.
●
If Cb is higher than 1 F, the benefit on THD+N and PSRR in the lower frequency range is
small.
The value of Cb also has an influence on startup time.
4.6
Power-on reset
When power is applied to VCC, an internal Power On Reset holds the TS4975 in a reset state
(shutdown) until the supply voltage reaches its nominal value. The Power On Reset has a
typical threshold of 1.75V.
During this reset state the outputs configuration is the same like in the shutdown mode (see
Section 4.2: Output configuration on page 25).
F
CL
1
2
πR
LCout
-------------------------- Hz
()
=
1
2
πZ
inCin
------------------------
1
2
πR
L Cout
--------------------------
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|---|---|
| TS4982IQT | 2 W, 2 CHANNEL, AUDIO AMPLIFIER, QCC32 |
| TS4984EIJT | 1.2 W, 2 CHANNEL, AUDIO AMPLIFIER, PBGA15 |
| TS4984EIKJT | 1.2 W, 2 CHANNEL, AUDIO AMPLIFIER, PBGA15 |
| TS4984EKIJT | 1.2 W, 2 CHANNEL, AUDIO AMPLIFIER, PBGA15 |
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相關代理商/技術參數 |
參數描述 |
|---|---|
| TS4982IQT | 功能描述:音頻放大器 2W Stereo Audio Amp 125 mW 16 ohm 3 lvl 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 |
| 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 |
| 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 |
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