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| 型号： | MAX97002EWP+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 14/37页 |
| 文件大小： | 0K |
| 描述： | IC AUDIO SUBSYSTEM 20WLP |
| 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： | 920mW x 1 @ 8 欧姆; 37mW x 2 @ 16 欧姆 |
| 电源电压： | 2.7 V ~ 5.5 V |
| 特点： | 消除爆音，差分输入，I²C，静音，关闭，音量控制 |
| 安装类型： | 表面贴装 |
| 供应商设备封装： | 20-WLP |
| 封装/外壳： | 20-WFBGA，WLBGA |
| 包装： | 标准包装 |
| 其它名称： | MAX97002EWP+TDKR |
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Audio Subsystem with Mono Class D
Speaker and Class H Headphone Amplifiers
MAX97002
21
Distortion Limiter
The MAX97002 speaker amplifiers integrate a limiter
to provide speaker protection and audio compression.
When enabled, the limiter monitors the audio signal at
the output of the Class D speaker amplifier and decreas-
es the gain if the distortion exceeds the predefined
threshold. The limiter automatically tracks the battery
voltage to reduce the gain as the battery voltage drops.
Figure 5 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.
Analog Switch
The MAX97002 integrates a DPST analog audio switch
that connects COM1 and COM2 to OUTP and OUTN,
respectively. Unlike discrete solutions, the switch design
reduces coupling of Class D switching noise to the COM_
inputs. This eliminates the need for a costly T-switch.
Drive COM1 and COM2 with a low-impedance source
to minimize noise on the pins. In applications that do not
require the analog switch, leave COM1 and COM2 uncon-
nected. When applying signal on COM1 and COM2, dis-
able the Class D amplifier before closing the switch.
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 DirectDrive architecture uses a charge pump
to create an internal negative supply voltage. This allows
the headphone outputs of the MAX97002 to be biased
at GND while operating from a single supply (Figure 6).
Without a DC component, there is no need for the large
DC-blocking capacitors. Instead of two large (220FF,
typ) capacitors, the MAX97002 charge pump requires
two small ceramic capacitors, conserving board space,
reducing cost, and improving the frequency response
of the headphone amplifier. See the Output Power
vs. Load Resistance graph in the Typical Operating
Characteristics for details of the possible capacitor
sizes. There is a low DC voltage on the amplifier out-
puts due to amplifier offset. However, the offset of the
MAX97002 is typically Q0.6mV, which, when combined
with a 32I load, results in less than 50FA of DC current
flow to the headphones.
Figure 5. Limiter Gain Curve
Figure 6.Traditional Amplifier Output vs. MAX97002
DirectDrive Output
DirectDrive is a registered trademark of Maxim Integrated
Products, Inc.
MAXIMUM THD+N
LEVEL
VOUT
VIN
VDD
VDD / 2
GND
CONVENTIONAL AMPLIFIER BIASING SCHEME
DirectDrive AMPLIFIER BIASING SCHEME
+VDD
SGND
-VDD
相关PDF资料 |
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| MAX97003EWP+T | IC AUDIO SUBSYSTEM LN 20WLP |
| MAX9700AEUB+ | IC AMP AUDIO 1.6W MONO D 10MSOP |
| MAX9701ETG+T | IC AMP AUDIO PWR 2.2W D 24TQFN |
| MAX9702ETI+T | IC AMP AUDIO PWR 1.8W D 28TQFN |
| MAX9704ETJ+ | IC AMP AUDIO PWR 16W STER 32TQFN |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX97003EVKIT# | 功能描述:音频 IC 开发工具 MAX97003 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 |
| MAX97003EWP+ | 制造商:Maxim Integrated Products 功能描述:AUDIO SUBSYSTEM - Rail/Tube |
| MAX97003EWP+T | 功能描述:音频放大器 Audio 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 |
| 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 |
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