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參數(shù)資料
| 型號： | TS4995EIJT |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 1.2 W, 1 CHANNEL, AUDIO AMPLIFIER, PBGA9 |
| 封裝： | LEAD FREE, FCP-9 |
| 文件頁數(shù)： | 9/26頁 |
| 文件大?。?/td> | 440K |
| 代理商： | TS4995EIJT |
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TS4995
Application information
17/26
4
Application information
4.1
Differential configuration principle
The TS4995 is a monolithic full-differential input/ output power amplifier with fixed +6 dB
gain. The TS4995 also includes a common mode feedback loop that controls the output bias
value to average it at VCC/2 for any DC common mode input voltage. This allows maximum
output voltage swing, and therefore, to maximize the output power. Moreover, as the load is
connected differentially instead of single-ended, output power is four times higher for the
same power supply voltage.
The advantages of a full-differential amplifier are:
●
Very high PSRR (power supply rejection ratio)
●
High common mode noise rejection
●
Virtually no pop and click without additional circuitry, giving a faster start-up time
compared to conventional single-ended input amplifiers
●
Easier interfacing with differential output audio DAC
●
No input coupling capacitors required due to common mode feedback loop
In theory, the filtering of the internal bias by an external bypass capacitor is not necessary.
However, to reach maximum performance in all tolerance situations, it is recommended to
keep this option.
4.2
Common mode feedback loop limitations
As explained previously, the common mode feedback loop allows the output DC bias voltage
to be averaged at VCC/2 for any DC common mode bias input voltage.
feedback loop can fulfil its role only within the defined range.
4.3
Low frequency response
The input coupling capacitors block the DC part of the input signal at the amplifier inputs. Cin
and Rin form a first-order high pass filter with -3 dB cut-off frequency.
Note:
The input impedance for the TS4995 is typically 20k
Ω and there is tolerance around this
value.
)
Hz
(
C
R
2
1
F
in
CL
×
π
×
=
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相關(guān)代理商/技術(shù)參數(shù) |
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| TS4997 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:2 x 1W differential input stereo audio amplifier with programmable 3D effects |
| TS4997IQT | 功能描述:音頻放大器 Stereo w/3D effects 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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| TS4998IQT | 功能描述:音頻放大器 2X1W Differential Input 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 |
| TS4999 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Filter-free stereo 2.8 W class D audio power amplifier with selectable 3D sound effects |
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