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| 型号： | MAX9792CETI+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 11/34页 |
| 文件大小： | 0K |
| 描述： | IC AMP AUDIO 2.0W STER D 28TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1 |
| 系列： | DirectDrive® |
| 类型： | D 类 |
| 输出类型： | 1-通道（单声道），带立体声耳机 |
| 在某负载时最大输出功率 x 通道数量： | 3.7W x 1 @ 3 欧姆; 180mW x 2 @ 32 欧姆 |
| 电源电压： | 4.5 V ~ 5.5 V |
| 特点： | 消除爆音，LDO，短路保护和热保护，关机 |
| 安装类型： | 表面贴装 |
| 供应商设备封装： | 28-TQFN-EP（4x4） |
| 封装/外壳： | 28-WFQFN 裸露焊盘 |
| 包装： | 管件 |
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MAX9791/MAX9792
Windows Vista-Compliant Class D Speaker
Amplifiers with DirectDrive Headphone Amplifiers
______________________________________________________________________________________
19
conserve board space and system cost, as well as
improve low-frequency response and distortion.
The MAX9791/MAX9792 amplifiers feature an under-
voltage lockout that prevents operation from an insuffi-
cient power supply and click-and-pop suppression that
eliminates audible transients on startup and shutdown.
The amplifiers include thermal overload and short-cir-
cuit protection.
Class D Speaker Amplifier
The MAX9791/MAX9792 integrate a filterless class D
amplifier that offers much higher efficiency than class AB
amplifiers. The high efficiency of a Class D amplifier is
due to the switching operation of the output stage tran-
sistors. In a Class D amplifier, the output transistors act
as current steering switches and consume negligible
additional power. Any power loss associated with the
Class D output stage is mostly due to the I2R loss of the
MOSFET on-resistance and quiescent current overhead.
The theoretical best efficiency of a linear amplifier is
78%, however, that efficiency is only exhibited at peak
output power. Under normal operating levels (typical
music reproduction levels), efficiency falls below 45%,
whereas the MAX9791/MAX9792 exhibit 67% efficiency
under the same conditions (Figure 1).
Ultra-Low EMI Filterless Output Stage
In traditional Class D amplifiers, the high dv/dt of the
rising and falling edge transitions resulted in increased
electromagnetic-interference (EMI) emissions, which
required the use of external LC filters or shielding to
meet EN55022B EMI regulation standards. Limiting the
dv/dt normally results in decreased efficiency. Maxim’s
active emissions limiting circuitry actively limits the
dv/dt of the rising and falling edge transitions, providing
reduced EMI emissions while maintaining up to 83%
efficiency.
0
20
10
50
40
30
80
70
60
90
0
0.50
0.25
0.75
1.00
1.25
1.50
EFFICIENCY vs. IDEAL
CLASS AB EFFICIENCY
OUTPUT POWER (W)
EFFICIENCY
(%)
IDEAL CLASS AB
MAX9791
Figure 1. MAX9791 Efficiency vs. Class AB Efficiency
DEVICE TYPE
REQUIREMENT
WINDOWS PREMIUM
MOBILE VISTA
SPECIFICATIONS
MAX9791/MAX9792
TYPICAL PERFORMANCE
THD+N
≤ -65dB FS [100Hz, 20kHz]
87dBFS [100Hz, 20kHz]
Dynamic range with signal
present
≤ -80dBV, A-weighted [20Hz,
20kHz]
-98.9dB A-weighted [20Hz, 20kHz]
Analog Line-Out Jack
(RL = 10k
, FS =
0.707VRMS)
Line output crosstalk
≤ -50dB [20Hz, 15kHz]
64dB [20Hz, 15kHz]
THD+N
≤ -45dB FS [100Hz, 20kHz]
82dBFS [100Hz, 20kHz]
Dynamic range with signal
present
≤ -60dBV, A-weighted [20Hz,
20kHz]
-91.5dB A-weighted [20Hz, 20kHz]
Analog Headphone-Out
Jack (RL = 32
, FS =
0.300VRMS)
Headphone output
crosstalk
≤ -50dB [20Hz, 15kHz]
64dB [20Hz, 15kHz]
Table 1. Windows Premium Mobile Vista Specifications vs. MAX9791/MAX9792
Specifications
Note: THD+N, dynamic range with signal present, and crosstalk should be measured in accordance with AES17 audio measure-
ments standards.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX9792CETI+ | 功能描述:音频放大器 Windows Vista Class D Speaker Amp 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 |
| MAX9792CETI+T | 功能描述:音频放大器 Windows Vista Class D Speaker Amp 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 |
| MAX9796EBX+TG45 | 功能描述:音频放大器 2.3W High-Power Class D Subsystem 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 |
| MAX9796EVKIT | 制造商:Maxim Integrated Products 功能描述:2.3W HIGH-POWER CLASS D AUDIO SUBS - Rail/Tube |
| MAX9796EVKIT+ | 制造商:Maxim Integrated Products 功能描述:MAX9796 EVAL KIT - Boxed Product (Development Kits) |
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