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參數(shù)資料
| 型號： | TS4975 |
| 廠商： | 意法半導體 |
| 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)： | 27/33頁 |
| 文件大?。?/td> | 747K |
| 代理商： | TS4975 |
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TS4975
Application Information
27/33
4.7
Startup time
When the TS4975 is controlled to switch to full standby (output mode 0) to another output
mode, a delay is necessary to stabilize the DC bias.This length of this delay depends on the Cb
and Vcc values. A typical value can be calculated by following formula:
This formula assumes that Cb voltage is equal to 0 V. If the Cb voltage is not equal 0 V, the
startup time will be always lower.
In
Figure 50
you could easily establish typical startup time for given supply voltage and bypass
capacitor Cb.
Figure 62. Typical startup time versus bypass capacitance
4.8
Pop and click performance
The TS4975 has internal pop and click reduction circuitry which eliminates the output
transients, for example during switch-on or switch-off phases, during a switch from an output
mode to another or during change in volume. The performance of this circuitry is closely linked
to the values of the input capacitor Cin, the output capacitor Cout (for Single-Ended
configuration) and the bias voltage bypass capacitor Cb.
The value of Cin and Cout is determined by the the lower cut-off frequency value requested.
The value of Cb will affect the THD+N and PSRR values in lower frequencies.
The TS4975 is optimized to have a low pop and click in the typical schematic configuration (
see
Figure 1 on page 3
SE and PHG configurations).
t
wu
C
b
V
CC
1.2
–
V
×
50000
0.008 s
+
×
=
0.4
0.8
1.2
1.6
2.0
2.4
2.8
3.2
3.6
4.0
0
50
100
150
200
250
300
350
400
Vcc=2.5V
Vcc=3.3V
S
Bypass capacitor Cb (
μ
F)
Vcc=5V
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相關代理商/技術參數(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: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
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