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參數(shù)資料
| 型號： | TS489IST |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 0.13 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO8 |
| 封裝： | MINI, SOP-8 |
| 文件頁數(shù)： | 18/32頁 |
| 文件大?。?/td> | 570K |
| 代理商： | TS489IST |
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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
相關PDF資料 |
PDF描述 |
|---|---|
| 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 |
| TS4890IS | 1 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO8 |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| TS4900 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:300mW at 3.3V SUPPLY AUDIO POWER AMPLIFIER WITH STANDBY MODE ACTIVE HIGH |
| TS4900ID | 功能描述:音頻放大器 300mW Audio Pwr Amp RoHS:否 制造商:STMicroelectronics 產品: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 |
| TS4900IDT | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:300mW at 3.3V SUPPLY AUDIO POWER AMPLIFIER WITH STANDBY MODE ACTIVE HIGH |
| TS4900IS | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:300mW at 3.3V SUPPLY AUDIO POWER AMPLIFIER WITH STANDBY MODE ACTIVE HIGH |
| TS4900IST | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:300mW at 3.3V SUPPLY AUDIO POWER AMPLIFIER WITH STANDBY MODE ACTIVE HIGH |
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