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参数资料
| 型号： | G1420F31Uf |
| 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： | 10/20页 |
| 文件大小： | 386K |
| 代理商： | G1420F31UF |
Ver: 1.5
Aug 04, 2005
TEL: 886-3-5788833
http://www.gmt.com.tw
18
G1420
Global Mixed-mode Technology Inc.
Application Information
Input MUX Operation
There are two input signal paths – HP & Line. With the
prompt setting, G1420 allows the setting of different
gains for BTL and SE modes. Generally, speakers
typically require approximately a factor of 10 more
gain for similar volume listening levels as compared
with headphones.
SE Gain(HP) = -(RF(HP)/RI(HP))
BTL Gain(LINE) = -2(RF(LINE)/RI(LINE))
To achieve headphones and speakers listening parity,
(RF(LINE/RI(LINE)) is suggested to be 5 times of (RF(HP)/
RI(HP)). The ratio of (RF(HP)/RI(HP)) can be determined by
the applications. When the optimum distortion per-
formance into the headphones (clear sound) is impor-
tant, gain of –1 ((RF(HP) / RI(HP)) = 1) is suggested.
Single Ended Mode Operation
G1420 can drive clean, low distortion SE output power
into headphone loads (generally 16
Ω or 32Ω) as in
Figure A. Please refer to Electrical Characteristics to
see the performances. A coupling capacitor is needed
to block the dc offset voltage, allowing pure ac signals
into headphone loads. Choosing the coupling capaci-
tor will also determine the 3 dB point of the high-pass
filter network, as Figure B.
fC=1/(2πRLCC)
For example, a 68uF capacitor with 32
Ω headphone
load would attenuate low frequency performance be-
low 73Hz. So the coupling capacitor should be well
chosen to achieve the excellent bass performance
when in SE mode operation.
Bridged-Tied Load Mode Operation
G1420 has two linear amplifiers to drive both ends of
the speaker load in Bridged-Tied Load (BTL) mode
operation. Figure C shows the BTL configuration. The
differential driving to the speaker load means that
when one side is slewing up, the other side is slewing
down, and vice versa. This configuration in effect will
double the voltage swing on the load as compared to a
ground reference load. In BTL mode, the peak-to-peak
voltage VO(PP) on the load will be two times than a
ground reference configuration. The voltage on the
load is doubled, this will also yield 4 times output
power on the load at the same power supply rail and
loading. Another benefit of using differential driving
configuration is that BTL operation cancels the dc off-
sets, which eliminates the dc coupling capacitor that is
needed to cancelled dc offsets in the ground reference
configuration. Low-frequency performance is then lim-
ited only by the input network and speaker responses.
Cost and PCB space can be minimized by eliminating
the dc coupling capacitors.
VDD
Vo(PP)
CC
RL
Figure A
VDD
Vo(PP)
CC
RL
Figure A
-3 dB
fc
Figure B
-3 dB
fc
Figure B
VDD
Vo(PP)
VDD
-Vo(PP)
2xVo(PP)
RL
Figure C
VDD
Vo(PP)
VDD
-Vo(PP)
2xVo(PP)
RL
Figure C
相关PDF资料 |
PDF描述 |
|---|---|
| G1420F31U | 2W Stereo Audio Amplifier |
| G1420 | 2W Stereo Audio Amplifier |
| G1421F | 2W Stereo Audio Amplifier with No Headphone Coupling Capacitor Function |
| G1422F2UF | 2W Stereo Audio Amplifier |
| G1422F2U | 2W Stereo Audio Amplifier |
相关代理商/技术参数 |
参数描述 |
|---|---|
| G1421 | 功能描述:安装硬件 RG 2.58-64-8 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: |
| G1421F | 制造商:GMT 制造商全称:Global Mixed-mode Technology Inc 功能描述:2W Stereo Audio Amplifier with No Headphone Coupling Capacitor Function |
| G1422 | 功能描述:安装硬件 RG 2.5-68-2 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: |
| G1-422-057 | 制造商:HECON / DANAHER 功能描述: |
| G1-422-122 | 制造商:HECON / DANAHER 功能描述: |
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