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参数资料
| 型号： | MAX9722BETE+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 5/21页 |
| 文件大小： | 0K |
| 描述： | IC AMP AUDIO .13W STER AB 16TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 100 |
| 系列： | DirectDrive® |
| 类型： | AB 类 |
| 输出类型： | 耳机，2-通道（立体声） |
| 在某负载时最大输出功率 x 通道数量： | 130mW x 2 @ 32 欧姆 |
| 电源电压： | 2.4 V ~ 5.5 V |
| 特点： | 消除爆音，差分输入，短路和热保护，关闭 |
| 安装类型： | 表面贴装 |
| 供应商设备封装： | 16-TQFN-EP（3x3） |
| 封装/外壳： | 16-WFQFN 裸露焊盘 |
| 包装： | 管件 |
Common-Mode Sense
When the headphone jack is used as a line out to inter-
face between other equipment (notebooks, desktops,
and stereo receivers), potential differences between
the equipment grounds can create ground loops and
excessive ground-current flow. The MAX9722A’s INR+
and INL+ inputs are connected together to form a com-
mon-mode input that senses and corrects for the differ-
ence between the headphone return and device
ground (see Figure 8). Connect INR+ and INL+ through
a resistive voltage-divider between the headphone jack
return and SGND of the device. For optimum common-
mode rejection, use the same value resistors for R1 and
RF, and R2 and RIN. For the MAX9722B, RIN = 15k
Ω
and RF = 30k
Ω. Improve DC CMRR by adding a
capacitor between SGND and R2 (see the Typical
Application Circuit). If ground sensing is not required,
connect INR+ and INL+ directly to SGND.
Common-Mode Noise Rejection
Figure 9 shows a theoretical connection between two
devices, for example, a notebook computer (transmit-
ter, on the left) and an amplifier (receiver, on the right),
MAX9722A/MAX9722B
5V, Differential Input, DirectDrive, 130mW
Stereo Headphone Amplifiers with Shutdown
______________________________________________________________________________________
13
LEFT
AUDIO
INPUT
RIGHT
AUDIO
INPUT
SHDN
R2
R1
MAX9722A
Figure 8. Common-Mode Sense Input Eliminates Ground-Loop
Noise
VNOISE
0.1
Ω
0.1
Ω
0.1
Ω
0.1
Ω
VREF_IN = (VNOISE x 0.99)
VIN = VAUDIO + (VNOISE x 0.98)
RESISTOR IS
INSERTED
BETWEEN THE
JACK SLEEVE
AND
GND = 9.8
Ω
VAUDIO
GND NOISE COMPONENT IN
OUTPUT = VNOISE/100
EXAMPLE CONNECTION:
IMPROVEMENT FROM
ADDING MAX9722 WITH
SERIES RESISTANCE
9.8
Ω RESISTOR ADDS TO HP CROSSTALK, BUT DIFFERENTIAL
SENSING AT THE JACK SLEEVE CORRECTS FOR THIS (ONE CHANNEL
ONLY SHOWN).
CURRENT FLOW (IN SIGNAL CABLE SCREEN) DUE TO VNOISE
IS GREATLY REDUCED.
NOISE COMPONENT IN THE RECEIVER OUTPUT IS REDUCED BY 34dB
OVER THE PREVIOUS EXAMPLE WITH THE VALUES SHOWN.
9.8
Ω
0.10
Ω RESISTANCE FROM CABLE SCREEN.
0.10
Ω RESISTANCE DUE TO GND CABLING AT RECEIVER.
VNOISE REPRESENTS THE POTENTIAL DIFFERENCE BETWEEN
THE TWO GNDS.
VREF_IN = VNOISE/2
VIN = VAUDIO
GND NOISE COMPONENT IN
OUTPUT = VNOISE/2
MAX9722A
Figure 9. Common-Mode Noise Rejection
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX9722BETE+ | 功能描述:音频放大器 DirectDrive 130mW Headphone 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 |
| MAX9722BETE+G104 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX9722BETE+T | 功能描述:音频放大器 DirectDrive 130mW Headphone 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 |
| MAX9722BETE+WG104 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX9722BETE-T | 功能描述:音频放大器 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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