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| 型号： | MAX9776ETJ+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 26/38页 |
| 文件大小： | 0K |
| 描述： | IC AMP AUDIO PWR 1.5W D 32TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 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： | 1.5W x 1 @ 4 欧姆; 60mW 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，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： | 32-TQFN-EP（5x5） |
| 封装/外壳： | 32-WFQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 配用： | MAX9776EVKIT+-ND - EVALUATION KIT FOR MAX9776 |
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Single-Ended Input
The MAX9775/MAX9776 can be configured as a single-
ended input amplifier by appropriately configuring the
Input Control Register (see Tables 5a and 5b).
DC-Coupled Input
The input amplifier can accept DC-coupled inputs that
are biased to the amplifier’s bias voltage. DC-coupling
eliminates the input-coupling capacitors; reducing com-
ponent count to potentially six external components
(see the
Typical Application Circuits). However, the
highpass filtering effect of the capacitors is lost, allow-
ing low-frequency signals to feed through to the load.
Unused Inputs
Connect any unused input pin directly to VBIAS. This
saves input capacitors on unused inputs and provides
the highest noise immunity on the input.
Component Selection
Input Filter
An input capacitor (CIN) in conjunction with the input
impedance of the MAX9775/MAX9776 form a highpass
filter that removes the DC bias from the incoming signal.
The AC-coupling capacitor allows the amplifiers to auto-
matically bias the signal to an optimum DC level.
Assuming zero source impedance, the -3dB point of the
highpass filter is given by:
Choose CIN so that f-3dB is well below the lowest fre-
quency of interest. Use capacitors whose dielectrics
have low-voltage coefficients, such as tantalum or alu-
minum electrolytic. Capacitors with high-voltage coeffi-
cients, such as ceramics, may result in increased
distortion at low frequencies.
Other considerations when designing the input filter
include the constraints of the overall system and the
actual frequency band of interest. Although high-fidelity
audio calls for a flat-gain response between 20Hz and
20kHz, portable voice-reproduction devices such as cell
phones and two-way radios need only concentrate on
the frequency range of the spoken human voice (typi-
cally 300Hz to 3.5kHz). In addition, speakers used in
portable devices typically have a poor response below
300Hz. Taking these two factors into consideration, the
input filter may not need to be designed for a 20Hz to
20kHz response, saving both board space and cost
due to the use of smaller capacitors.
Class D Output Filter
The MAX9775/MAX9776 do not require a Class D out-
put filter. The devices pass EN55022B emission stan-
dards with 152mm of unshielded speaker cables.
However, output filtering can be used if a design is fail-
ing radiated emissions due to board layout or cable
length, or the circuit is near EMI-sensitive devices. Use
a ferrite bead filter when radiated frequencies above
10MHz are of concern. Use an LC filter when radiated
frequencies below 10MHz are of concern, or when long
leads (> 152mm) connect the amplifier to the speaker.
Figure 12 shows optional speaker amplifier output filters.
External Component Selection
BIAS Capacitor
VBIAS is the output of the internally generated DC bias
voltage. The VBIAS bypass capacitor, CVBIAS improves
PSRR and THD+N by reducing power supply and other
noise sources at the common-mode bias node, and
also generates the clickless/popless, startup/shutdown
DC bias waveforms for the speaker amplifiers. Bypass
VBIAS with a 1F capacitor to GND.
f
RC
dB
IN IN
=
3
1
2
π
MAX9775/MAX9776
2 x 1.5W, Stereo Class D Audio Subsystem
with DirectDrive Headphone Amplifier
32
______________________________________________________________________________________
OUT_+
OUT_-
33
μH
33
μH
0.47
μF
0.033
μF
0.1
μF
22
Ω
22
Ω
0.033
μF
0.1
μF
Figure 12. Speaker Amplifier Output Filter
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX9776EVKIT+ | 功能描述:音频 IC 开发工具 MAX9776 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 |
| MAX9777ETI+ | 功能描述:音频放大器 Integrated Circuits (ICs) 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 |
| MAX9777ETI+T | 功能描述:音频放大器 Integrated Circuits (ICs) 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 |
| MAX9778ETI+ | 功能描述:音频放大器 Integrated Circuits (ICs) 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 |
| MAX9778ETI+T | 功能描述:音频放大器 Integrated Circuits (ICs) 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 |
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