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參數(shù)資料
| 型號(hào)： | TLV1012-15YDCR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 1 CHANNEL, AUDIO AMPLIFIER, PBGA4 |
| 封裝： | GREEN, DSBGA-4 |
| 文件頁(yè)數(shù)： | 12/12頁(yè) |
| 文件大?。?/td> | 246K |
| 代理商： | TLV1012-15YDCR |
Noise
V
CC
Output
Input
10 pF
33 pF
www.ti.com .......................................................................................................................................... SLCS154A – OCTOBER 2008 – REVISED NOVEMBER 2008
Noise pick-up by a microphone in cell phones is a well known problem. A conventional JFET circuit is sensitive
for noise pick-up because of its high output impedance, which is usually around 2.2 k
.
RF noise is among other noises caused by nonlinear behavior. The nonlinear behavior of the amplifier at high
frequencies, well above the usable bandwidth of the device, causes AM demodulation of high-frequency signals.
The AM modulation contained in such signals folds back into the audio band, thereby disturbing the intended
microphone signal. The GSM signal of a cell phone is such an AM-modulated signal. The modulation frequency
of 216 Hz and its harmonics can be observed in the audio band. This kind of noise is called bumblebee noise.
RF noise caused by a GSM signal can be reduced by connecting two external capacitors to ground (see
Figure 7). One capacitor reduces the noise caused by the 900-MHz carrier, and the other reduces the noise
caused by 1800/1900 MHz.
Figure 7. RF Noise Reduction
Copyright 2008, Texas Instruments Incorporated
9
Product Folder Link(s): TLV1012
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| TLV1018-15YDCR | 功能描述:音頻放大器 Amp for 3-Wire Ana Electret Microphones 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 |
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