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參數(shù)資料
| 型號： | MAX9770 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | 1.2W Low-EMI, Filterless, Mono Class D Amplifier with Stereo DirectDrive Headphone Amplifiers |
| 中文描述： | 1.2W、低EMI、無需慮波、單聲道D類放大器，帶有立體聲DirectDrive耳機(jī)放大器 |
| 文件頁數(shù)： | 12/24頁 |
| 文件大?。?/td> | 493K |
| 代理商： | MAX9770 |
fundamental switching frequency and its associated
harmonics (see the Wideband FFT graph in the
Typical
Operating Characteristics
). The MAX9770 allows the
switching frequency to be changed by +32% should
the frequency of one or more harmonics fall in a sensi-
tive band. This can be done during operation and does
not affect audio reproduction.
Spread-Spectrum Modulation (SSM) Mode
The MAX9770 features a unique, patented spread-
spectrum mode that flattens the wideband spectral
components, improving EMI emissions radiated by the
speaker and cables by 5dB. Proprietary techniques
ensure that the cycle-to-cycle variation of the switching
period does not degrade audio reproduction or effi-
ciency (see the
Typical Operating Characteristics
).
Select SSM mode by setting SYNC = V
DD
. In SSM
mode, the switching frequency varies randomly by
±
120kHz around the center frequency (1.22MHz). The
modulation scheme remains the same, but the period
of the sawtooth waveform changes from cycle-to-cycle
(Figure 2). Instead of a large amount of spectral energy
present at multiples of the switching frequency, the
energy is now spread over a bandwidth that increases
with frequency. Above a few MHz, the wideband spec-
trum looks like white noise for EMI purposes (Figure 3).
M
1.2W Low-EMI, Filterless, Mono Class D Amplifier
with Stereo DirectDrive Headphone Amplifiers
12
______________________________________________________________________________________
V
OUT+
- V
OUT-
t
SW
t
SW
t
SW
t
SW
V
IN-
V
IN+
OUT+
OUT-
t
ON(MIN)
Figure 2. MAX9770 Output with an Input Signal Applied (SSM mode)
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX9770ETI | 1.2W Low-EMI, Filterless, Mono Class D Amplifier with Stereo DirectDrive Headphone Amplifiers |
| MAX9770EUI | 1.2W Low-EMI, Filterless, Mono Class D Amplifier with Stereo DirectDrive Headphone Amplifiers |
| MAX9981 | 825MHz to 915MHz, Dual SiGe High-Linearity Active Mixer |
| MAX9981EGX-T | 825MHz to 915MHz, Dual SiGe High-Linearity Active Mixer |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX9770ETI | 制造商:Maxim Integrated Products 功能描述:1.2W LOW-EMI, FILTERLESS, MONO CLASS D AMPLIF - Rail/Tube |
| MAX9770ETI+ | 功能描述:音頻放大器 1.2W Low-EMI Class D Amplifier 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 |
| MAX9770ETI+T | 功能描述:音頻放大器 1.2W Low-EMI Class D Amplifier 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 |
| MAX9770EUI | 制造商:Rochester Electronics LLC 功能描述: |
| MAX9770EUI+ | 功能描述:音頻放大器 1.2W Low-EMI Class D Amplifier 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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