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參數(shù)資料
| 型號： | MAX9722BEUE+T |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 5/21頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC AMP AUDIO .13W STER 16TSSOP |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 系列： | DirectDrive® |
| 類型： | AB 類 |
| 輸出類型： | 耳機(jī)，2-通道（立體聲） |
| 在某負(fù)載時最大輸出功率 x 通道數(shù)量： | 130mW x 2 @ 32 歐姆 |
| 電源電壓： | 2.4 V ~ 5.5 V |
| 特點(diǎn)： | 消除爆音，差分輸入，短路和熱保護(hù)，關(guān)閉 |
| 安裝類型： | 表面貼裝 |
| 供應(yīng)商設(shè)備封裝： | 16-TSSOP |
| 封裝/外殼： | 16-TSSOP（0.173"，4.40mm 寬） |
| 包裝： | 帶卷 (TR) |
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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| MAX97236EVKIT# | 功能描述:放大器 IC 開發(fā)工具 MAX97236 Eval Kit RoHS:否 制造商:International Rectifier 產(chǎn)品:Demonstration Boards 類型:Power Amplifiers 工具用于評估:IR4302 工作電源電壓:13 V to 23 V |
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| MAX97236EWA+T | 功能描述:音頻放大器 Jack Detection and Configuration System RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| MAX9723AEBE | 制造商:Maxim Integrated Products 功能描述:STEREO DIRECTDRIVE HEADPHONE AMPLIF - Rail/Tube |
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