參數(shù)資料
型號(hào)： TS4975
廠(chǎng)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(jī)驅(qū)動(dòng)集成電路放大器通過(guò)總線(xiàn)與數(shù)字音量控制
文件頁(yè)數(shù)： 25/33頁(yè)
文件大小： 747K
代理商： TS4975
TS4975
Application Information
25/33
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 51
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:
4.4
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
μ
F, you could expect similar THD+N performances like shown in the datasheet.
If Cs is lower than 1
μ
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
μ
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
μ
F, THD+N increases at lower frequencies and the PSRR worsens
upwards.
If Cb is higher than 1
μ
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.
4.5
Power-on reset
When power is applied to Vdd, an internal Power On Reset holds the TS4975 in a reset state
until the supply voltage reaches its nominal value.
The Power On Reset has a typical threshold of 1.75V.
F
CL
2
π
R
L
C
out
----------1
(
)
=
π
Z
in
C
in
2
π
R
L
C
out
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(chēng):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(lèi)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(lèi)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(chēng):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(lèi)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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