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參數(shù)資料
| 型號(hào)： | TS489IST |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | Pop-free 120mW stereo headphone amplifier |
| 中文描述： | 流行無120mW立體聲耳機(jī)放大器 |
| 文件頁(yè)數(shù)： | 25/32頁(yè) |
| 文件大小： | 465K |
| 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 C
in
, C
out
, C
feed
), the output voltage
is:
The gain A
V
is:
4.6
Decoupling of the circuit
Two capacitors are needed to properly bypass the TS488 (TS489), a power supply capacitor
C
s
and a bias voltage bypass capacitor C
b
.
C
s
has a strong influence on the THD+N in the high frequency range (above 7kHz) and
indirectly on the power supply disturbances. With 1μF, you can expect THD+N performance
to be similar to the one shown in the datasheet. If C
s
is lower than 1μF, the THD+N
increases in the higher frequencies and disturbances on the power supply rail are less
filtered. On the contrary, if C
s
is higher than 1μF, the disturbances on the power supply rail
are more filtered.
C
b
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 C
b
is lower than 1μF, the THD+N improves and the PSRR worsens.
■
If C
b
is higher than 1μF, the benefit on the THD+N and PSRR is small.
The input capacitor C
in
also has a significant effect on the PSRR at lower frequencies. The
lower the value of C
in
, the higher the PSRR.
Note:
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
R
in
--------------
–
V
IN
A
V
=
=
A
V
R
R
in
--------------
–
=
25K
25K
600K
600K
Vin1
BYPASS
Vin2
Vout1
Vout2
GND
TS488/9
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相關(guān)代理商/技術(shù)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(chǎn)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(fēng)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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