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參數(shù)資料
| 型號(hào)： | MAX9727EEP+T |
| 廠(chǎng)商： | Maxim Integrated Products |
| 文件頁(yè)數(shù)： | 12/13頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC AMP AUDIO QUAD AB DIFF 20QSOP |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 系列： | DirectDrive® |
| 類(lèi)型： | AB 類(lèi) |
| 輸出類(lèi)型： | 4-通道（四路） |
| 電源電壓： | 2.7 V ~ 5.5 V |
| 特點(diǎn)： | 消除爆音，差分輸入，關(guān)閉，熱保護(hù) |
| 安裝類(lèi)型： | 表面貼裝 |
| 供應(yīng)商設(shè)備封裝： | 20-QSOP |
| 封裝/外殼： | 20-SSOP（0.154"，3.90mm 寬） |
| 包裝： | 帶卷 (TR) |
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MAX9727
Quad Audio Line Driver with 3VRMS Output
8
_______________________________________________________________________________________
Detailed Description
The MAX9727 is a quad audio line driver with an output
of 3VRMS from a single +5V supply and 2VRMS from a
single +3.3V supply. The device employs Maxim’s
DirectDrive architecture that produces a ground-refer-
enced output from a single supply, eliminating the
need for large DC-blocking capacitors. An internal
charge pump creates an internal negative supply volt-
age. This allows the amplifier outputs of the MAX9727
to be biased at GND, almost doubling dynamic range
while operating from a single supply.
An active-low shutdown input disables the amplifiers
and reduces quiescent current consumption to less
than 100nA.
The MAX9727 also features click-and-pop suppression
circuitry that reduces audible clicks and pops during
startup and shutdown.
DirectDrive
Maxim’s DirectDrive architecture uses a charge pump
to create an internal negative supply voltage, allowing
the MAX9727 outputs to be biased about ground. This
allows for a symmetrical output biased around 0V. The
MAX9727’s charge pump requires two small ceramic
capacitors, conserving board space, reducing cost,
and improving the frequency response of the ampli-
fiers. See the Charge-Pump Output Voltage vs. Output
Current graphs in the
Typical Operating Characteristics
for details of the possible capacitor sizes. There is a
low DC voltage on the amplifier outputs due to amplifier
offset. However, the offsets of the MAX9727 are typical-
ly 500V, which, when combined with a 1kΩ load,
results in less than 500nA of DC current flow to the line-
in device.
Charge Pump
The MAX9727 features a low-noise charge pump. The
300kHz switching frequency is well beyond the audio
range and does not interfere with audio signals. The
switch drivers feature a controlled switching speed that
minimizes noise generated by turn-on and turn-off tran-
sients. The di/dt noise caused by the parasitic bond
wire and trace inductance is minimized by limiting the
switching speed of the charge pump. Although not typ-
ically required, additional high-frequency noise attenu-
ation can be achieved by increasing the value of C2
(see the
Functional Diagram/Typical Operating Circuit).
CONVENTIONAL DRIVER BIASING SCHEME
DirectDrive BIASING SCHEME
GND
VOUT
VDD
2VDD
VDD
VDD/2
GND
Figure 1. Conventional Driver Output Waveform vs. MAX9727
Output Waveform
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| MAX9728AETC+ | 功能描述:音頻放大器 60mW DirectDrive Headphone Amplifier RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類(lèi)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 |
| MAX9728AETC+T | 功能描述:音頻放大器 60mW DirectDrive Headphone Amplifier RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類(lèi)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 |
| MAX9728AETC+TG104 | 制造商:Maxim Integrated Products 功能描述: |
| MAX9728AETC+TGA8 | 制造商:Maxim Integrated Products 功能描述: |
| MAX9728AEUD+ | 功能描述:音頻放大器 60mW DirectDrive Headphone Amplifier RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類(lèi)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 |
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