- 您现在的位置：买卖IC网 > PDF目录2091 > MAX9741ETN+D (Maxim Integrated Products)IC AMP AUDIO PWR 12W STER 56TQFN PDF资料下载
参数资料
| 型号： | MAX9741ETN+D |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 2/16页 |
| 文件大小： | 0K |
| 描述： | IC AMP AUDIO PWR 12W STER 56TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 37 |
| 类型： | D 类 |
| 输出类型： | 2 通道（立体声） |
| 在某负载时最大输出功率 x 通道数量： | 12W x 2 @ 8 欧姆 |
| 电源电压： | 10 V ~ 25 V |
| 特点： | 消除爆音，差分输入，静音，短路和热保护，关机 |
| 安装类型： | 表面贴装 |
| 供应商设备封装： | 56-TQFN-EP（8x8） |
| 封装/外壳： | 56-WFQFN 裸露焊盘 |
| 包装： | 管件 |
MAX9741
12W+12W, Low-EMI, Spread-Spectrum,
Stereo, Class D Amplifier
10
______________________________________________________________________________________
Ferrite beads are available from many manufacturers.
Table 3 lists some manufacturers who make ferrite
beads and other products suitable for use with Class D
amplifiers.
Although they offer a low cost and small size, ferrite
bead filters slightly increase distortion and slightly
reduce efficiency. If the audio performance of the ferrite
bead filters does not meet the system requirements, then
a full inductor/capacitor (LC) filter should be considered.
Inductor/Capacitor Output Filters
Using a full inductor and capacitor (LC) output filter
provides significant attenuation of the fundamental
switching energy.
Select inductors rated for the expected RMS current
load. For example, if using a Class D amplifier up to
10W into 8
, the inductor should be rated for 1.25A
RMS or more. Furthermore, the inductor should maintain
a constant inductance value across the expected cur-
rent range. Inductors which change in value as a func-
tion of current will cause harmonic distortion.
The output capacitors can also affect audio perfor-
mance. Ceramic capacitors are often selected for their
size and cost advantage, but they cause distortion. If
the application constraints dictate ceramic capacitors,
selecting higher voltage rating and larger package size
mitigates some of the shortcomings. Best performance
is obtained with plastic film capacitors, but these are
larger and more expensive.
Filterless Operation
In some cases, a Class D amplifier can be used without
an output filter. The intrinsic inductance of the loud-
speaker stores energy from the high-speed PWM pulses,
converting these into power in the audible frequency
range. Filterless operation requires the Class D amplifi-
er to be very close to the speaker. Distances greater
than a few centimeters must be evaluated for EMC
compliance.
Gain Selection
Table 4 shows the suggested gain settings to attain a
maximum output power from a given peak input voltage
and given load.
Output Offset
Unlike a Class AB amplifier, the output offset voltage of
Class D amplifiers does not noticeably increase quies-
cent current draw when a load is applied. This is due to
the power conversion of the Class D amplifier. For
example, an 8mVDC offset across an 8
load results in
1mA extra current consumption in a Class AB device.
In the Class D case, an 8mV offset into 8
equates
to an additional power drain of 8W. Due to the high
efficiency of the Class D amplifier, this represents an
additional quiescent current draw of: 8W / (VDD / 100
η), which is in the order of a few microamps.
Input Amplifier
Differential Input
The MAX9741 features a differential input structure, mak-
ing them compatible with many CODECs, and offering
improved noise immunity over a single-ended input ampli-
fier. In devices such as PCs, noisy digital signals can be
picked up by the amplifier’s input traces. The signals
appear at the amplifiers’ inputs as common-mode noise. A
differential input amplifier amplifies the difference of the
two inputs, any signal common to both inputs is canceled.
Table 4. Gain Settings
G1
G2
GAIN (dB)
00
29.6
01
19.1
10
13
11
16
Table 3. Filter Component Suppliers
SUPPLIER
PRODUCT
WEBSITE
Murata
Ferrite beads,
capacitors
www.murata.com
Taiyo Yuden
Ferrite beads,
capacitors
www.t-yuden.com
TDK
Ferrite beads,
capacitors
www.tdk.co.jp/tetop01
Fairrite
Ferrite beads
www.fair-rite.com
Coilcraft
Inductors
www.coilcraft.com
Sumida
Inductors
www.sumida.com
Panasonic
Inductors
www.panasonic.com/indu
strial/components
相关PDF资料 |
PDF描述 |
|---|---|
| MAX9742ETX+ | IC AMP AUDIO PWR 20.5W D 36TQFN |
| MAX9744ETH+ | IC AMP AUDIO PWR 22.5W D 44TQFN |
| MAX9753ETI+T | IC AMP AUDIO PWR 2.2W D 28TQFN |
| MAX9755ETI+T | IC AMP AUDIO PWR 2.6W AB 28TQFN |
| MAX9758ETJ+T | IC AMP AUDIO PWR 2.3W AB 32TQFN |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX9741EVKIT | 制造商:Maxim Integrated Products 功能描述:12W+12W FILTERLESS - Rail/Tube 制造商:Maxim Integrated Products 功能描述:12W+12W FILTERLESS SPREAD-SPECTRU - Rail/Tube |
| MAX9742ETX+ | 功能描述:音频放大器 Stereo 16W Class D Amplifier 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 |
| MAX9742ETX+T | 功能描述:音频放大器 Stereo 16W Class D Amplifier 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 |
| MAX9742EVKIT+ | 功能描述:音频放大器 Evaluation Kit for the MAX9742 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 |
| MAX9744ETH+ | 功能描述:音频放大器 Stereo 20W Class D Amplifier 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 |
发布紧急采购，3分钟左右您将得到回复。