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参数资料
| 型号： | TS4974IQT |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 音频控制 |
| 英文描述： | 1 CHANNEL(S), VOLUME CONTROL CIRCUIT, DSO10 |
| 封装： | 3 X 3 MM, 0.50 MM PITCH, ROHS COMPLIANT, DFN-10 |
| 文件页数： | 11/25页 |
| 文件大小： | 319K |
| 代理商： | TS4974IQT |
TS4974
Application information
19/25
4.4
Decoupling of the circuit
Two capacitors are needed to correctly bypass the TS4974. 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 performance to that shown in the datasheet.
In the high frequency region, if CS is lower than 1 F, it increases the THD+N, and
disturbances on the power supply rail are less filtered.
On the other hand, if CS is higher than 1 F, the 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).
4.5
Wake-up time (tWU)
When the standby is released to put the device ON, the bypass capacitor Cb is not 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 the wake-up
with Cb=1 F. During the wake-up phase, the TS4974 gain is close to zero. After the wake-
up time, the gain is released and set to its nominal value.
Figure 40.
Startup time vs. bypass capacitor
4.6
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, the Bypass pin and Vin+, Vin- pins are short-circuited to ground by
internal switches. This allows a quick discharge of Cb and Cin capacitors.
0,4
0,8
1,2
1,6
2,0
0
5
10
15
Tamb=25
°C
Vcc=2.6V
Vcc=3.3V
Vcc=5V
St
a
rtup
Time
(
m
s
)
Bypass Capacitor Cb (
μF)
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TS4975 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:Stereo Headphone Drive Amplifier with Digital Volume Control via I2C Bus |
| TS4975_05 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:Stereo Headphone Drive Amplifier with Digital Volume Control via I2C Bus |
| TS4975EIJT | 功能描述:音频放大器 Stereo headphone 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 |
| TS4982IQT | 功能描述:音频放大器 2W Stereo Audio Amp 125 mW 16 ohm 3 lvl 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 |
| TS4984 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:2 x 1W Stereo audio power amplifier with active low standby mode |
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