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参数资料
| 型号： | MAX9768BETG+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 5/26页 |
| 文件大小： | 0K |
| 描述： | IC AMP AUDIO 10W MONO D 24TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1 |
| 类型： | D 类 |
| 输出类型： | 1-通道（单声道） |
| 在某负载时最大输出功率 x 通道数量： | 10W x 1 @ 8 欧姆 |
| 电源电压： | 4.5 V ~ 14 V |
| 特点： | 消除爆音，I²C，静音，短路和热保护，关机，音量控制 |
| 安装类型： | 表面贴装 |
| 供应商设备封装： | 24-TQFN-EP（4x4） |
| 封装/外壳： | 24-WFQFN 裸露焊盘 |
| 包装： | 标准包装 |
| 其它名称： | MAX9768BETG+TDKR |
Operating Modes
Fixed-Frequency Mode
The MAX9768 features two fixed-frequency modes:
300kHz and 360kHz. Connect SYNC to GND to select
300kHz switching frequency; leave SYNC unconnected
to select 360kHz switching frequency. The frequency
spectrum of the MAX9768 consists of the fundamental
switching frequency and its associated harmonics (see
the Wideband Output Spectrum graphs in the
Typical
Operating Characteristics). For applications where
exact spectrum placement of the switching fundamen-
tal is important, program the switching frequency so the
harmonics do not fall within a sensitive frequency band
(Table 1). Audio reproduction is not affected by chang-
ing the switching frequency.
Spread-Spectrum Mode
The MAX9768 features a unique spread-spectrum
mode that flattens the wideband spectral components,
improving EMI emissions that may be radiated by the
speaker and cables. This mode is enabled by setting
SYNC = VDD (Table 1). In SSM mode, the switching fre-
quency varies randomly by ±7.5kHz around the center
frequency (300kHz). The modulation scheme remains
the same, but the period of the triangle waveform
changes from cycle to cycle. 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. A proprietary amplifier topology ensures this
does not corrupt the noise floor in the audio bandwidth.
External Clock Mode
The SYNC input allows the MAX9768 to be synchro-
nized to an external clock, or another Maxim Class D
amplifier, creating a fully synchronous system, minimiz-
ing clock intermodulation, and allocating spectral com-
ponents of the switching harmonics to insensitive
frequency bands. Applying a clock signal between
1MHz and 1.6MHz to SYNC synchronizes the
MAX9768. The Class D switching frequency is equal to
one-fourth the SYNC input frequency.
SYNCOUT is equal to the SYNC input frequency and
allows several Maxim amplifiers to be cascaded. The
synchronized output minimizes interference due to
clock intermodulation caused by the switching spread
between single devices. The modulation scheme
remains the same when using SYNCOUT, and audio
reproduction is not affected (Figure 1). Current flowing
between SYNCOUT of a master device and SYNC of a
slave device is low as the SYNC input is high imped-
ance (typically 200kΩ).
MAX9768
10W Mono Class D Speaker
Amplifier with Volume Control
______________________________________________________________________________________
13
Table 1. Operating Modes
SYNC
OSCILLATOR FREQUENCY (kHz)
CLASS D FREQUENCY (kHz)
GND
Fixed-frequency modulation with fOSC = 1200
Fixed-frequency modulation with fOSC = 300
Unconnected
Fixed-frequency modulation with fOSC = 1440
Fixed-frequency modulation with fOSC = 360
VDD
Spread-spectrum modulation with fOSC = 1200 ±30
Spread-spectrum modulation with fOSC = 300 ±7.5
Clocked
Fixed-frequency modulation with fOSC = external clock
frequency
Fixed-frequency modulation with fOSC = external clock
frequency / 4
SYNCOUT
OUT+
OUT-
OUT+
OUT-
SYNC
MAX9768
Figure 1. Cascading Two Amplifiers
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX9768ETG+ | 功能描述:音频放大器 10W Mono Class D Speaker RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
| MAX9768ETG+T | 功能描述:音频放大器 10W Mono Class D Speaker RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
| MAX9768EVCMAXQU+ | 功能描述:音频放大器 Evaluation Kit/Evaluation System for the MAX9768 RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
| MAX9768EVKIT+ | 功能描述:音频 IC 开发工具 MAX9768 Eval Kit RoHS:否 制造商:Texas Instruments 产品:Evaluation Kits 类型:Audio Amplifiers 工具用于评估:TAS5614L 工作电源电压:12 V to 38 V |
| MAX976ESA | 功能描述:校验器 IC Dual High Speed Comparator RoHS:否 制造商:STMicroelectronics 产品: 比较器类型: 通道数量: 输出类型:Push-Pull 电源电压-最大:5.5 V 电源电压-最小:1.1 V 补偿电压（最大值）:6 mV 电源电流（最大值）:1350 nA 响应时间: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SC-70-5 封装:Reel |
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