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参数资料
| 型号： | TS489IQT |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 0.13 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO8 |
| 封装： | 2 X 2 MM, DFN-8 |
| 文件页数： | 18/32页 |
| 文件大小： | 570K |
| 代理商： | TS489IQT |
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TS488-TS489
Application information
25/32
4.5
Gain setting
In the flat frequency response region (with no effect from Cin, Cout, Cfeed), the output voltage
is:
The gain AV is:
4.6
Decoupling of the circuit
Two capacitors are needed to properly bypass the TS488 (TS489), a power supply capacitor
Cs and a bias voltage bypass capacitor Cb.
Cs has a strong influence on the THD+N in the high frequency range (above 7kHz) and
indirectly on the power supply disturbances. With 1F, you can expect THD+N performance
to be similar to the one shown in the datasheet. If Cs is lower than 1F, the THD+N
increases in the higher frequencies and disturbances on the power supply rail are less
filtered. On the contrary, if Cs is higher than 1F, the disturbances on the power supply rail
are more filtered.
Cb has an influence on the THD+N in the low frequency range. Its value is critical on the
PSRR with grounded inputs in the lower frequencies:
■ If Cb is lower than 1F, the THD+N improves and the PSRR worsens.
■ If Cb is higher than 1F, the benefit on the THD+N and PSRR is small.
Note:
The input capacitor Cin also has a significant effect on the PSRR at lower frequencies. The
lower the value of Cin, the higher the PSRR.
4.7
Standby mode
When the standby mode is activated an internal circuit of the TS488 (TS489) is charged
(see Figure 82). A time required to change the internal circuit is a few microseconds.
Figure 82.
Internal equivalent schematic of the TS488 (TS489) in standby mode
V
OUT
V
IN
R
feed
R
in
--------------
–
V
IN
A
V
==
A
V
R
feed
R
in
--------------
–
=
25K
600K
Vin1
BYPASS
Vin2
Vout1
Vout2
GND
TS488/9
相关PDF资料 |
PDF描述 |
|---|---|
| TS489IST | 0.13 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO8 |
| TS4890IDT | 1 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO8 |
| TS4890ID | 1 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO8 |
| TS4890IST | 1 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO8 |
| TS4890IQT | 1 W, 1 CHANNEL, AUDIO AMPLIFIER, DSO8 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| TS489IST | 功能描述:音频放大器 Popfree 100mW 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 |
| TS4900 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:300mW at 3.3V SUPPLY AUDIO POWER AMPLIFIER WITH STANDBY MODE ACTIVE HIGH |
| TS4900ID | 功能描述:音频放大器 300mW 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 |
| TS4900IDT | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:300mW at 3.3V SUPPLY AUDIO POWER AMPLIFIER WITH STANDBY MODE ACTIVE HIGH |
| TS4900IS | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:300mW at 3.3V SUPPLY AUDIO POWER AMPLIFIER WITH STANDBY MODE ACTIVE HIGH |
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