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參數資料
型號: MAX9776EVKIT+
廠商: Maxim Integrated Products
文件頁數: 13/38頁
文件大小: 0K
描述: EVALUATION KIT FOR MAX9776
產品培訓模塊: Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
標準包裝: 1
系列: DirectDrive®
放大器類型: 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 通道數量: 1.5W x 1 @ 4 歐姆; 60mW x 2 @ 16 歐姆
電源電壓: 2.7 V ~ 5.5 V
工作溫度: -40°C ~ 85°C
板類型: 完全填充
已用 IC / 零件: MAX9776
已供物品: 板,CD
相關產品: MAX9776EBX+TG45-ND - IC AMP AUDIO PWR 1.5W MONO 36WLP
MAX9776ETJ+T-ND - IC AMP AUDIO PWR 1.5W D 32TQFN
MAX9776ETJ+-ND - IC AMP AUDIO PWR 1.5W D 32TQFN
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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相關代理商/技術參數
參數描述
MAX9776EVKIT+ 功能描述:音頻 IC 開發工具 MAX9776 Eval Kit RoHS:否 制造商:Texas Instruments 產品:Evaluation Kits 類型:Audio Amplifiers 工具用于評估:TAS5614L 工作電源電壓:12 V to 38 V
MAX9777ETI+ 功能描述:音頻放大器 Integrated Circuits (ICs) RoHS:否 制造商:STMicroelectronics 產品: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: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel
MAX9777ETI+T 功能描述:音頻放大器 Integrated Circuits (ICs) RoHS:否 制造商:STMicroelectronics 產品: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: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel
MAX9778ETI+ 功能描述:音頻放大器 Integrated Circuits (ICs) RoHS:否 制造商:STMicroelectronics 產品: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: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel
MAX9778ETI+T 功能描述:音頻放大器 Integrated Circuits (ICs) RoHS:否 制造商:STMicroelectronics 產品: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: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel
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