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參數(shù)資料
| 型號： | TS4975 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | Stereo Headphone Drive Amplifier with Digital Volume Control via IC Bus |
| 中文描述： | 立體聲耳機驅(qū)動集成電路放大器通過總線與數(shù)字音量控制 |
| 文件頁數(shù)： | 24/33頁 |
| 文件大小： | 747K |
| 代理商： | TS4975 |
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Application Information
TS4975
24/33
The efficiency is the ratio between the output power and the power supply:
P
supply
The maximum theoretical value is reached when Vpeak = Vcc/2, so
The TS4975 is stereo amplifier so it has two independent power amplifiers. Each amplifier
produces heat due to its power dissipation. Therefore the maximum die temperature is the sum
of each amplifier’s maximum power dissipation. It is calculated as follows:
P
diss 1
= Power dissipation due to the first channel power amplifier.
P
diss 2
= Power dissipation due to the second channel power amplifier.
Total P
diss
= P
diss 1
+ P
diss 2
(W)
●
●
●
In most cases,
P
diss 1
= P
diss 2
, giving:
Single ended configuration
:
Phantom ground configuration:
4.3
Low frequency response
Input capacitor Cin
The input coupling capacitor blocks the DC part of the input signal at the amplifier input. In the
low-frequency region, Cin starts to have an effect. Cin with Zin forms a first-order, high-pass
filter with -3 dB cut-off frequency.
Zin is the input impedance of the corresponding input (30 k
for In1 & In2).
Note:
For all inputs, the impedance value remains for all gain settings. This means that the lower cut-
off frequency doesn’t change with gain setting. Note also that 30 k
is a typical value and there
is tolerance around this value (see
3: Electrical Characteristics on page 4
).
In
Figure 50
you could easily establish the Cin value for a -3dB cut-off frequency required.
η
P
π
V
CC
---4V
=
=
η
π
8
39.25%
=
=
TotalP
diss
2P
diss1
=
TotalP
diss
2 2V
π
R
L
---------------------- P
OUT
2P
OUT
W
(
)
–
=
TotalP
diss
4 2V
π
R
L
---------------------- P
OUT
2P
OUT
W
(
)
–
=
F
CL
π
Z
in
C
in
2
(
)
=
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TS4975_05 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Stereo Headphone Drive Amplifier with Digital Volume Control via I2C Bus |
| TS4975EIJT | 功能描述:音頻放大器 Stereo headphone 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 |
| 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(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 |
| 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 |
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