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参数资料
| 型号： | MAX9756ETX+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 13/31页 |
| 文件大小： | 0K |
| 描述： | IC AMP AUDIO PWR 2.3W AB 36TQFN |
| 标准包装： | 50 |
| 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： | 36-TQFN 裸露焊盘（6x6） |
| 封装/外壳： | 36-WFQFN 裸露焊盘 |
| 包装： | 管件 |
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MAX9756/MAX9757/MAX9758
BIAS
The MAX9756/MAX9757/MAX9758 feature an internally
generated, power-supply independent, common-mode
bias voltage of 2.5V referenced to GND. BIAS provides
both click-and-pop suppression and sets the DC bias
level for the amplifiers. Choose the value of the bypass
capacitor as described in the BIAS Capacitor section.
No external load should be applied to BIAS. Any load
lowers the BIAS voltage, affecting the overall perfor-
mance of the device.
BEEP Input
The MAX9756/MAX9757/MAX9758 feature an audible
alert beep input (BEEP) that accepts a mono system
alert signal and mixes it into the stereo audio path.
When the amplitude of VBEEP exceeds 300mVP-P and
the frequency of the beep signal is greater than 300Hz,
the beep signal is mixed into the active audio path
(speaker or headphone). If the signal at VBEEP is either
< 300mVP-P or < 300Hz, the BEEP signal is not mixed
into the audio path. The amplitude of the BEEP signal at
the device output is roughly the amplitude VBEEP times
the gain of the selected signal path.
The input resistor (RB) sets the gain of the BEEP input
amplifier, and thus the amplitude of VBEEP. Choose RB
based on:
The total BEEP gain is given by:
where 47k
is the value of the BEEP amplifier feedback
resistor, VBEEP is the BEEP amplifier output, VIN(BEEP)
is the BEEP input amplitude, and VOUT(BEEP) is the total
BEEP output signal. AV(BEEPOUT) is given by the values
listed in Table 5. Note that VBEEP must be higher than
300mVP-P. The BEEP amplifier can be set up as either
an attenuator, if the original alert signal amplitude is too
large, or to gain up the alert signal if it is below
300mVP-P. AC-couple the alert signal to BEEP. Choose
the value of the coupling capacitor as described in the
Input Filtering section. Multiple beep inputs can be
summed (Figure 12).
V
k
R
A
OUT BEEP
IN BEEP
B
V BEEPOUT
()
=+
47
R
Vk
V
B
IN BEEP
BEEP
()
≤
× 47
2.3W Stereo Speaker Amplifiers and DirectDrive
Headphone Amplifiers with Automatic Level Control
20
______________________________________________________________________________________
MAX9756/
MAX9757/
MAX9758
RB
47k
BEEP
0.47
F
SOURCE 3
RB
47k
0.47
F
SOURCE 2
RB
47k
0.47
F
SOURCE 1
47k
BIAS
WINDOW
DETECTOR
(0.3VP-P THRESHOLD)
FREQUENCY
DETECTOR
(300Hz THRESHOLD)
SPEAKER/HEADPHONE
AMPLIFIER INPUTS
VBEEP
Figure 12. Beep Input
Table 5. BEEP Output Gain
AV(BEEPOUT)
HEADPHONE *
(V/V)
SPEAKER*
(V/V)
GAIN3
GAIN2
GAIN1
1.5
8.4
0
1.5
9.4
0
1
1.78
10
0
1
0
1.78
10
0
1
1.5
15.8
1
0
1.5
18.8
1
0
1
1.78
20
1
0
1.78
20
1
*All output gains are for VVOL = GND.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX9756ETX+ | 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 |
| MAX9756ETX+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 |
| MAX9756EVKIT | 功能描述:放大器 IC 开发工具 Programmers, Development Systems RoHS:否 制造商:International Rectifier 产品:Demonstration Boards 类型:Power Amplifiers 工具用于评估:IR4302 工作电源电压:13 V to 23 V |
| MAX9757ETJ+ | 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 |
| MAX9757ETJ+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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