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| 型号： | G1422F2UF |
| 厂商： | Global Mixed-mode Technology Inc. |
| 元件分类： | 音频放大器 |
| 英文描述： | 2W Stereo Audio Amplifier |
| 中文描述： | 2W立体声音频放大器 |
| 文件页数： | 6/15页 |
| 文件大小： | 304K |
| 代理商： | G1422F2UF |
Ver: 1.2
Jun 29, 2005
TEL: 886-3-5788833
http://www.gmt.com.tw
14
G1422
Global Mixed-mode Technology Inc.
SHUTDOWN Mode Operations
The G1422 implements the shutdown mode opera-
tions to reduce supply current, IDD, to the absolute
minimum level during nonuse periods for bat-
tery-power conservation. When the shutdown pin
(pin 1) is pulled high, all linear amplifiers will be
deactivated to mute the amplifier outputs. And The
G1422 enters an extra low current consumption
state, IDD is smaller than 2A. Shutdown pin should
never be left unconnected, this floating condition
will cause the amplifier operations unpredictable.
Optimizing DEPOP Operation
Circuitry has been implemented in the G1422 to
minimize the amount of popping heard at power-up
and when coming out of shutdown mode. Popping
occurs whenever a voltage step is applied to the
speaker and making the differential voltage gener-
ated at the two ends of the speaker. To avoid the
popping heard, the bypass capacitor should be cho-
sen promptly, 1/(CBx100kΩ) ≦
1/(CI*(RI+RF)).
Where 100k
Ω is the output impedance of the mid-rail
generator, CB is the mid-rail bypass capacitor, CI is
the input coupling capacitor, RI is the input imped-
ance, RF is the gain setting impedance which is on
the feedback path. CB is the most important capacitor.
Besides it is used to reduce the popping, CB can also
determine the rate at which the amplifier starts up
during startup or recovery from shutdown mode.
De-popping circuitry of theG1422 is shown on Fig-
ure D. The PNP transistor limits the voltage drop
across the 225k
Ω by slewing the internal node
slowly when power is applied. At start-up, the volt-
age at BYPASS capacitor is 0. The PNP is ON to
pull the mid-point of the bias circuit down. So the
capacitor sees a lower effective voltage, and thus
the charging is slower. This appears as a linear
ramp (while the PNP transistor is conducting), fol-
lowed by the expected exponential ramp of an R-C
circuit.
Bypass
VDD
100 k
Ω
100 k
Ω
225 k
Ω
Figure D
Bypass
VDD
100 k
Ω
100 k
Ω
225 k
Ω
Figure D
相关PDF资料 |
PDF描述 |
|---|---|
| G1422F2U | 2W Stereo Audio Amplifier |
| G1422 | 2W Stereo Audio Amplifier |
| G1426D5T | 2.2W Stereo Audio Amplifier |
| G1426D5U | 2.2W Stereo Audio Amplifier |
| G1426F2T | 2.2W Stereo Audio Amplifier |
相关代理商/技术参数 |
参数描述 |
|---|---|
| G1423 | 功能描述:安装硬件 RG 2.5-68-4 2.875 DIA BLACK RoHS:否 制造商:Harwin 类型:SMT Cable Clip 材料:Phosphor Bronze 安装孔大小: 长度:5 mm 外径: 内径: 厚度: 电镀:Tin 螺纹大小: |
| G1425 | 功能描述:安装硬件 RG 2.5-72-8 3.000 DIA BLACK RoHS:否 制造商:Harwin 类型:SMT Cable Clip 材料:Phosphor Bronze 安装孔大小: 长度:5 mm 外径: 内径: 厚度: 电镀:Tin 螺纹大小: |
| G1426 | 功能描述:安装硬件 RG 2.5-72-10 3.000 DIA BLACK RoHS:否 制造商:Harwin 类型:SMT Cable Clip 材料:Phosphor Bronze 安装孔大小: 长度:5 mm 外径: 内径: 厚度: 电镀:Tin 螺纹大小: |
| G1426D5T | 制造商:GMT 制造商全称:Global Mixed-mode Technology Inc 功能描述:2.2W Stereo Audio Amplifier |
| G1426D5U | 制造商:GMT 制造商全称:Global Mixed-mode Technology Inc 功能描述:2.2W Stereo Audio Amplifier |
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