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参数资料
| 型号： | MAX9758ETJ+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 6/31页 |
| 文件大小： | 0K |
| 描述： | IC AMP AUDIO PWR 2.3W AB 32TQFN |
| 标准包装： | 2,500 |
| 系列： | DirectDrive® |
| 类型： | AB 类 |
| 输出类型： | 2-通道（立体声）带立体声耳机 |
| 在某负载时最大输出功率 x 通道数量： | 2.3W x 2 @ 3 欧姆; 130mW x 2 @ 16 欧姆 |
| 电源电压： | 4.5 V ~ 5.5 V |
| 特点： | 消除爆音，短路保护和热保护，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) |
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MAX9756/MAX9757/MAX9758
The MAX9756/MAX9757/MAX9758 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. An additional feature of the amplifiers is
that there is no phase inversion from input to output.
Automatic Level Control (ALC)
Two-watt amplifiers are commonly used in notebook
PCs (almost always powered from a 5V supply). With
an 8
speaker driven from a BTL amplifier, the maxi-
mum
theoretical continuous power available is:
See Figure 5 for suggested ALC component values.
The ALC feature offers two benefits:
1) To limit amplifier power to protect a loudspeaker.
2) To make input signals with a wide dynamic range
more intelligible by boosting low-level signals with-
out distorting the high-level signals.
A device without ALC experiences clipping at the output
when too much gain is applied to the input. ALC pre-
vents clipping at the output when too much gain is
applied to the input, eliminating output clipping. Figure 3
shows a comparison of an overgained speaker input with
and without ALC.
The MAX9756/MAX9758 control the gain to the speakers
by first detecting that the output voltage to the speaker
has exceeded a preset limit. The speaker amplifier gain
is rapidly reduced to correct for the excessive output
power. This process is known as the attack time. When
the signal subsequently lowers in amplitude, the gain is
held at the reduced state for a short period before slowly
increasing to the normal value. This process is known as
the hold and release time. The speed at which the ampli-
fiers adjust to changing input signals is set by the exter-
nal timing capacitor CCT and the setting of logic input
DR. The output power limit can be set by adjusting the
value of the external resistor connected to PREF. Gain
reduction is a function of input signal amplitude with a
maximum ALC attenuation of 6dB. Figure 4 shows the
effect of an input burst exceeding the preset limit, output
attack, hold and release times.
This process (referred to as “limiting” in audio) limits the
amplifier output power so loudspeaker overload can be
prevented. If the attack and release times are configured
to respond too fast, audible artifacts often, described as
“pumping” or “breathing,” can occur as the gain is rapid-
ly adjusted to follow the dynamics of the signal. For best
results, adjust the time constant of the ALC to accommo-
date the source material. Notebook applications in which
music CDs and DVDs are the main audio source, a
495s attack time with a 990ms release time is recom-
mended with a 1.2W output into an 8
load.
P
V
R
W
OUT
PEAK
SPEAKER
.
=
=
=
2
5
2
8
156
22
2.3W Stereo Speaker Amplifiers and DirectDrive
Headphone Amplifiers with Automatic Level Control
14
______________________________________________________________________________________
ALC DISABLE, CLIPPING AT THE OUTPUT
INPUT
SIGNAL
10ms/div
OUTPUT
SIGNAL
ALC ENABLE, NO CLIPPING AT THE OUTPUT
Figure 3. ALC Disabled vs. ALC Enabled
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX9759ETE+ | 功能描述:音频放大器 3.2W Low-EMI 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 |
| MAX9759ETE+T | 功能描述:音频放大器 3.2W Low-EMI 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 |
| MAX9759EUE+ | 制造商:Maxim Integrated Products 功能描述:- Rail/Tube |
| MAX9759EUE+T | 制造商:Maxim Integrated Products 功能描述:AUD AMP SPKR 1CH MONO 4.3W CLS-D 16TSSOP - Tape and Reel |
| MAX9759EVKIT | 功能描述:音频放大器 Evaluation Kit for the MAX9759 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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