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參數資料
| 型號： | TS4974IQT |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 音頻控制 |
| 英文描述： | 1 CHANNEL(S), VOLUME CONTROL CIRCUIT, DSO10 |
| 封裝： | 3 X 3 MM, 0.50 MM PITCH, ROHS COMPLIANT, DFN-10 |
| 文件頁數： | 8/25頁 |
| 文件大小： | 319K |
| 代理商： | TS4974IQT |
Application information
TS4974
16/25
4
Application information
4.1
Differential configuration principle
The TS4974 is a monolithic full-differential input/ output power amplifier with a digital volume
control. It has an internal gain range of -33 dB up to +12 dB, by steps of 3dB (see
Section 4.9: Volume setting on page 20), which offers better performance in terms of noise
immunity and PSRR.
The advantages of a full-differential amplifier are:
●
Very high PSRR (power supply rejection ratio).
●
High common mode noise rejection.
●
Virtually zero pop without additional circuitry, giving a faster start-up time compared to
conventional single-ended input amplifiers.
●
Easier interfacing with differential output audio DAC.
In theory, the filtering of the internal bias by an external bypass capacitor is not necessary.
But, to reach maximum performance in all tolerance situations, it is better to keep this
option.
4.2
Low frequency response
The input coupling capacitors block the DC part of the input signal at the amplifier inputs.
Input capacitors Cin and input impedance Zin forms a first-order, high pass filter with -3 dB
cut-off frequency.
Note:
Differential input impedance of 60 k
Ω is a typical value, and there is tolerance around this
value.
-3 dB.
Figure 39.
-3dB lower cut-off frequency vs. input capacitance
)
Hz
(
C
R
2
1
F
in
CL
×
π
×
=
0.5
1
10
100
Typical Input
Impedance
Maximum Input
Impedance
Minimum Input
Impedance
All gain setting
Tamb=25
°C
L
o
w
-3dB
Cut
O
ff
Frequency
(H
z)
Input Capacitor Cin (
μF)
0.1
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相關代理商/技術參數 |
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|---|---|
| TS4975 | 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 |
| 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 |
| 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 |
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