參數(shù)資料
型號: MAX9776ETJ+T
廠商: Maxim Integrated Products
文件頁數(shù): 13/38頁
文件大?。?/td> 0K
描述: IC AMP AUDIO PWR 1.5W D 32TQFN
產(chǎn)品培訓模塊: Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
標準包裝: 2,500
系列: DirectDrive®
類型: D 類
輸出類型: 1-通道(單聲道),帶立體聲耳機
在某負載時最大輸出功率 x 通道數(shù)量: 1.5W x 1 @ 4 歐姆; 60mW x 2 @ 16 歐姆
電源電壓: 2.7 V ~ 5.5 V
特點: 消除爆音,差分輸入,I²C,靜音,短路和熱保護,關(guān)機,音量控制
安裝類型: 表面貼裝
供應商設備封裝: 32-TQFN-EP(5x5)
封裝/外殼: 32-WFQFN 裸露焊盤
包裝: 帶卷 (TR)
配用: MAX9776EVKIT+-ND - EVALUATION KIT FOR MAX9776
MAX9775/MAX9776
Operating Modes
Fixed-Frequency Modulation
The MAX9775/MAX9776 feature a fixed-frequency
modulation mode with a 1.1MHz switching frequency,
set through the I2C interface (Table 2). In fixed-frequen-
cy modulation mode, the frequency spectrum of the
Class D output consists of the fundamental switching
frequency and its associated harmonics (see the
Wideband Output Spectrum Fixed-Frequency Mode
graph in the
Typical Operating Characteristics).
Spread-Spectrum Modulation
The MAX9775/MAX9776 feature a unique spread-spec-
trum modulation that flattens the wideband spectral com-
ponents. Proprietary techniques ensure that the
cycle-to-cycle variation of the switching period does not
degrade audio reproduction or efficiency (see the
Typical Operating Characteristics). Select spread-spec-
trum modulation mode through the I2C interface (Table
2). In spread-spectrum modulation mode, the switching
frequency varies randomly by ±30kHz around the center
frequency (1.16MHz). 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
megahertz, the wideband spectrum looks like white
noise for EMI purposes (see Figure 3).
2 x 1.5W, Stereo Class D Audio Subsystem
with DirectDrive Headphone Amplifier
20
______________________________________________________________________________________
VOUT+ - VOUT-
tSW
VIN-
VIN+
OUT+
OUT-
tON(MIN)
Figure 2. Output with an Input Signal Applied (Spread-Spectrum Modulation Mode)
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