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参数资料
| 型号： | TS4984EIKJT |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 1.2 W, 2 CHANNEL, AUDIO AMPLIFIER, PBGA15 |
| 封装： | LEAD FREE, FCP-15 |
| 文件页数： | 15/30页 |
| 文件大小： | 1644K |
| 代理商： | TS4984EIKJT |
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Application Information
TS4984FC
22/30
●
If Cb is higher than 1F, the benefit on THD+N at lower frequencies is small, but the benefit
to PSRR is substantial.
Note:
The TS4984FC has two BYPASS pins. Cb can be connected equally to pin C5 or to pin C1.
These pins are internally connected. Connecting pin C5 and pin C1 together by an external
wire is optional.
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 required to reach this voltage is called the wake-up time
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 = 1F in the range of
0.8F
≤ 1F ≤ 1.2F).
4.7
Shutdown time
When the standby command is set, the time required to put the two output stages in high
impedance and the internal circuitry in shutdown mode is a few microseconds.
Note:
In shutdown mode, Bypass pin and Vin- pin are short-circuited to ground by internal switches.
This allows for the quick discharge of the Cb and Cin capacitors.
Figure 64. Typical wake-up time vs. Cb
Figure 65. 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 |
|---|---|
| TS4984FC | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:1.2W Stereo Audio Power Amplifier with Active Low Standby Mode |
| TS4984IQT | 功能描述:音频放大器 2x1W stereo audio Pwr amp 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 |
| 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 |
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