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参数资料
| 型号： | FSA2000UMX |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 7/11页 |
| 文件大小： | 0K |
| 描述： | IC HS-USB/AUDIO SWITCH 16UMLP |
| 标准包装： | 1 |
| 功能： | 音频，USB 开关 |
| 电路： | 1 x 1:1 |
| 电压电源： | 单电源 |
| 电压 - 电源，单路/双路(±)： | 2.7 V ~ 4.3 V |
| 电流 - 电源： | 6µA（USB），3mA（音频） |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-UMLP |
| 供应商设备封装： | 16-UMLP（1.8x2.6） |
| 包装： | 标准包装 |
| 其它名称： | FSA2000UMXDKR |
2009 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FSA2000
Rev. 1.0.0
5
FS
A2
0
00
–
Auto
-Se
lecti
ng
HS
-US
B
Swit
ch
with
Cap
-Free
He
ad
phon
e
Au
dio
Ampli
fier
Detailed Description
USB Compliance
Figure 5. High-Speed USB 2.0 Eye Compliance (5.5V)
Transient Suppression
A common issue with headphone amplifiers is audible noises
through the headset when the amplifier is powering up or
down. Sharp transients often occur on the audio outputs
during this transition that cause audible “click and pop.” The
FSA2000 prevents these transients during power-up by
muting the outputs until the internal charge pumps are
stable. This ensures that any transients caused by the
charge pump are not propagated to the outputs. In cases
where the application needs a longer startup time for mute,
the FSA2000 has a MUTE pin that allows application control
over the behavior of the amplifier during startup and power
down. The MUTE pin forces the audio outputs into a known
and controlled state so that any transients of the amplifier
are not propagated to the headphones as clicks and pops.
Figure 6 shows the correct timing of the MUTE pin in relation
to the /SHDN pin for optimal click and pop performance.
Figure 6. Power-Up and Power-Down Timing
Table 1.
Recommended MUTE Timing
Parameter
Description
Suggested
Timing
TMUTEPU_SETUP
MUTE setup time to /SHDN
rising edge
>500ns
TMUTEPU_HOLD
MUTE hold time to /SHDN
rising edge
~500ns
TMUTEPD_SETUP
MUTE setup time to /SHDN
falling edge
>500ns
TMUTEPD_HOLD
MUTE hold time to /SHDN
falling edge
~500ns
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