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| 型号： | MAX97003EWP+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 19/48页 |
| 文件大小： | 0K |
| 描述： | IC AUDIO SUBSYSTEM LN 20WLP |
| 标准包装： | 2,500 |
| 类型： | D 类；H 类 |
| 输出类型： | 1-通道（单声道）或 2-通道（立体声） |
| 在某负载时最大输出功率 x 通道数量： | 1W x 2 @ 8 欧姆 |
| 电源电压： | 2.7 V ~ 5.5 V |
| 特点： | 消除爆音，差分输入，关闭 |
| 安装类型： | * |
| 供应商设备封装： | * |
| 封装/外壳： | * |
| 包装： | * |
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Maxim Integrated Products 26
MAX97003
High-Efficiency, Low-Noise Audio Subsystem
Speaker Low-Power Mode
The IC’s speaker path expander includes a low-power
mode that increases power efficiency when there is no
desired input signal. Set the programmable threshold
in register 0x0F to determine when low-power mode is
activated. When low-power mode is enabled, the Class
D switching output is active only if the speaker volume
setting selected by the expander is above the selected
low-power mode threshold. For example, if the speaker
low-power mode threshold is set to -30dB and the input
signal is such that the speaker expander attenuates
the output volume setting to at least -30dB, the Class D
amplifier is turned off (Figure 11). Low-power mode is
only available when the speaker expander is enabled.
Distortion Limiter
The speaker amplifier integrates a limiter to provide
speaker protection and ensures high-quality audio. When
enabled, the limiter monitors the audio signal at the out-
put of the Class D speaker amplifier and decreases the
gain if the distortion exceeds the predefined threshold.
Attenuation is achieved by automatically modifying the
speaker volume as appropriate. The limiter automatically
tracks the battery voltage to reduce the gain as the bat-
tery voltage drops.
Figure 12 shows the typical output vs. input curves with
and without the distortion limiter. The dotted line shows
the maximum gain for a given distortion limit without
the distortion limiter. The solid line shows how, with the
distortion limiter enabled, the gain can be increased
without exceeding the set distortion limit. When the
limiter is enabled, selecting a high gain level results in
peak signals being attenuated while low signals are left
unchanged. This increases the perceived loudness with-
out the harshness of a clipped waveform.
To operate the distortion limiter, select a distortion thresh-
old and release time constant through the 0x0E register.
ZCD must be set to 0 in register 0x11 for the distortion
limiter to operate properly.
Headphone Amplifier
DirectDrive
Traditional single-supply headphone amplifiers have
outputs biased at a nominal DC voltage (typically half
the supply). Large coupling capacitors are needed to
block this DC bias from the headphone. Without these
capacitors, a significant amount of DC current flows to
the headphone, resulting in unnecessary power dis-
sipation and possible damage to both headphone and
headphone amplifier.
Maxim’s patented DirectDriveM architecture uses a
charge pump to create an internal negative supply volt-
age. This allows the headphone outputs of the IC to be
biased at GND while operating from a single supply
(Figure 13). Without a DC component, there is no need
for the large DC-blocking capacitors. Instead of two large
(220FF, typ) capacitors, the IC's charge pump requires
Figure 11. High-Signal to Low-Signal Transition, Speaker
Expander with Speaker Low-Power Mode
Figure 12. Limiter Gain Curve
DirectDrive is a registered trademark of Maxim Integrated
Products, Inc.
SPKP
SPKN
INPUT
DISTORTION
(% THD+N)
DISTORTION
THRESHOLD
LEVEL
< 1 TO 24
LIMITER
ENABLED AND
GAIN INCREASED
LIMITER
DISABLED
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX9700AEBC | 制造商:Maxim Integrated Products 功能描述:1.2W LOW EMI FILTERLESS CLASS D - Rail/Tube |
| MAX9700AEBC+ | 制造商:Maxim Integrated Products 功能描述:AUD AMP SPKR 1CH MONO 1.6W CLS-D 12UCSP - Rail/Tube |
| MAX9700AEBC+T | 功能描述:音频放大器 1.2W L-EMI Filterles Class D Audio 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 |
| MAX9700AEBC-T | 功能描述:音频放大器 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 |
| MAX9700AETB | 制造商:Maxim Integrated Products 功能描述:1.2W, LOW EMI, FILTERLESS, CLASS D AUDIO AMPL - Rail/Tube |
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