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参数资料
| 型号： | TS4984IQT |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 1 W, 2 CHANNEL, AUDIO AMPLIFIER, QCC16 |
| 封装： | 4 X 4 MM, 0.50 MM PITCH, LEAD FREE, TQFN-16 |
| 文件页数： | 15/29页 |
| 文件大小： | 901K |
| 代理商： | TS4984IQT |
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TS4984
Application Information
22/29
4.5 Decoupling the circuit
Two capacitors are needed to correctly bypass the TS4984. A power supply bypass capacitor CS and a
bias voltage bypass capacitor CB.
CS has particular influence on the THD+N in the high frequency region (above 7 kHz) and an indirect
influence on power supply disturbances. With a value for CS of 1 F, you can expect similar THD+N
performances to those shown in the datasheet. For example:
l In the high frequency region, if CS is lower than 1 F, it increases THD+N and disturbances on the
power supply rail are less filtered.
l On the other hand, if CS is higher than 1 F, those disturbances on the power supply rail are more
filtered.
Cb has an influence on THD+N at lower frequencies, but its function is critical to the final result of PSRR
(with input grounded and in the lower frequency region), in the following manner:
l If Cb is lower than 1F, THD+N increases at lower frequencies and PSRR worsens.
l If Cb is higher than 1F, the benefit on THD+N at lower frequencies is small, but the benefit to PSRR
is substantial.
Note that Cin has a non-negligible effect on PSRR at lower frequencies. The lower the value of Cin, the
higher the PSRR.
4.6 Wake-up time, TWU
When the standby is released to put the device ON, the bypass capacitor Cb will not be charged
immediately. As Cb is directly linked to the bias of the amplifier, the bias will not work properly until the Cb
voltage is correct. The time to reach this voltage is called wake-up time or TWU and specified in electrical
characteristics table with Cb =1F.
If Cb has a value other than 1 F, please refer to the graph in Figure 66 to establish the wake-up time
value.
Due to process tolerances, the maximum value of wake-up time could be establish by the graph in
Note:
Bypass capacitor Cb as also a tolerance of typically +/-20%. To calculate the wake-up time with this tolerance,
refer to the previous graph (considering for example for Cb = 1 F in the range of 0.8 F ≤ 1F ≤ 1.2 F).
Figure 66: Typical wake-up time vs. Cb
Figure 67: Maximum wake-up time vs. Cb
12
34
0
100
200
300
400
500
600
4.7
0.1
Tamb=25
°C
Vcc=2.6V
Vcc=3.3V
Vcc=5V
St
ar
tup
Ti
me
(
m
s)
Bypass Capacitor Cb ( F)
12
34
0
100
200
300
400
500
600
Tamb=25
°C
4.7
0.1
Vcc=5V
Vcc=3.3V
Vcc=2.6V
Max.
St
ar
tup
Ti
me
(
m
s)
Bypass Capacitor Cb ( F)
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TS4985 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:2x1.2w Stereo Audio Power Amplifier with Dedicated Standby Pins |
| TS4985EIJT | 功能描述:音频放大器 2x1.2W stereo audio RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
| TS4985EIKJT | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:2x1.2w Stereo Audio Power Amplifier with Dedicated Standby Pins |
| TS4985EKIJT | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:2x1.2w Stereo Audio Power Amplifier with Dedicated Standby Pins |
| TS4990 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:1W AUDIO POWER AMPLIFIER WITH ACTIVE LOW STANDBY MODE |
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