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參數(shù)資料
| 型號(hào)： | TS4984EKIJT |
| 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(shù)： | 11/29頁 |
| 文件大?。?/td> | 1751K |
| 代理商： | TS4984EKIJT |
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TS4984FC
Application Information
19/29
4.2
Gain in typical application schematic
The typical application schematic (
Figure 62) is shown on page 18.
In the flat region (no
Cin effect), the output voltage of the first stage is:
For the second stage:
Vout2 =-Vout1 (V)
The differential output voltage is:
The differential gain, referred to as
Gv for greater convenience, is:
Vout2 is in phase with Vin and Vout1 is phased 180° with Vin. This means that the positive
terminal of the loudspeaker should be connected to
Vout2 and the negative to Vout1.
4.3
Low and high frequency response
In the low frequency region,
Cin starts to have an effect. Cin forms with Rin a high-pass filter with
a -3dB cut-off frequency:
In the high frequency region, you can limit the bandwidth by adding a capacitor (
Cfeed) in
parallel with
Rfeed. It forms a low-pass filter with a -3dB cut-off frequency. FCH is in Hz.
The following graph (
Figure 63) shows an example of C
in and Cfeed influence.
Figure 63. Frequency response gain versus Cin & Cfeed
V
out 1
V
–
in
()
R
feed
R
in
--------------
(V)
=
V
out 2
V
out1
–
2V
in
R
fee d
R
in
--------------
(V)
=
G
v
V
out2
V
out 1
–
V
in
-----------------------------------
2
R
feed
R
in
--------------
==
F
CL
1
2
πR
in
C
in
--------------------------
(Hz)
=
F
CH
1
2
πR
feed
C
fe ed
-------------------------------------
(Hz)
=
10
100
1000
10000
-25
-20
-15
-10
-5
0
5
10
Rin = Rfeed = 22k
Tamb = 25
°C
Cfeed = 2.2nF
Cfeed = 680pF
Cfeed = 330pF
Cin = 470nF
Cin = 82nF
Cin = 22nF
G
a
in
(dB
)
Frequency (Hz)
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)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(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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| TS4985EIJT | 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 |
| 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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