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參數(shù)資料
| 型號： | MAX9727EEP+ |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 13/13頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC AMP AUDIO QUAD AB DIFF 20QSOP |
| 標準包裝： | 50 |
| 系列： | DirectDrive® |
| 類型： | AB 類 |
| 輸出類型： | 4-通道（四路） |
| 電源電壓： | 2.7 V ~ 5.5 V |
| 特點： | 消除爆音，差分輸入，關閉，熱保護 |
| 安裝類型： | 表面貼裝 |
| 供應商設備封裝： | 20-QSOP |
| 封裝/外殼： | 20-SSOP（0.154"，3.90mm 寬） |
| 包裝： | 管件 |
Shutdown Mode
The MAX9727 features a low-power shutdown mode
that reduces quiescent current consumption to less
than 0.1A and extends battery life for portable appli-
cations. Drive SHDN low to disable the amplifiers and
the charge pump. In shutdown mode, each amplifier’s
output resistance is high impedance to small signals.
The resulting output resistance seen by the load is
determined by the series combination of the amplifier’s
external gain-setting resistors in parallel with the ampli-
fier’s shutdown output resistance.
Click-and-Pop Suppression
In conventional single-supply audio amplifiers, the out-
put-coupling capacitor contributes significantly to audi-
ble clicks and pops. Upon startup, the amplifier charges
the coupling capacitor to its bias voltage, typically half
the supply. Likewise, on shutdown, the capacitor is dis-
charged. This results in a DC shift across the capacitor,
which appears as an audible transient at the speaker
connected to the output of the power amplifier of the
audio system. Since the MAX9727 does not require out-
put-coupling capacitors, this problem does not arise.
Additionally, the MAX9727 features extensive click-and-
pop suppression that eliminates any audible transient
sources internal to the device.
In some applications, the output of the device driving
the MAX9727 may have a DC bias. At startup, the
input-coupling capacitor is charged to the input
device’s DC-bias voltage through the input and feed-
back resistors of the MAX9727, resulting in a DC shift
across the capacitor and an audible click/pop. Delay
the rise of SHDN 4 to 5 time constants based on RIN
and CIN (4 x RIN x CIN), relative to the startup of the
input device, to eliminate clicks-and-pops caused by
the input filter.
Applications Information
Amplifier Configurations
The MAX9727 works in many standard op-amp config-
urations such as inverting, noninverting, voltage follow-
er, summing, difference, active filters, and many others.
No special design considerations are required. The
DirectDrive architecture of the MAX9727 simplifies
many circuits due to the ground-referenced outputs.
Differential Input Configuration
Figure 2 shows a single channel of the MAX9727 con-
figured as a differential input amplifier. A differential
input offers improved noise immunity over a single-
ended input. In systems that include high-speed digital
circuitry, high-frequency noise can couple into the
amplifier’s input traces. The signals appear at the
amplifier’s inputs as common-mode noise. A differential
input amplifier amplifies the difference of the two
inputs, and signals common to both inputs are sub-
tracted out. When configured for differential inputs, the
voltage gain of the MAX9727 is set by:
where AV is the desired voltage gain in V/V. RIN1 must
be equal to RIN2, and RF1 must be equal to RF2.
The common-mode rejection ratio (CMRR) is limited by
the external resistor-matching. Ideally, to achieve the
highest possible CMRR the following condition should
be met:
R
F
IN
F
IN
1
2
=
A
R
V
F
IN
=
1
MAX9727
Quad Audio Line Driver with 3VRMS Output
_______________________________________________________________________________________
9
IN_-
RIN1
RIN2
RF2
IN_+
OUT_
RF1
OUT_ =
RIN1 = RIN2, RF1 = RF2
RF1
RIN1
(IN_ + - IN_-)
MAX9727
Figure 2. Differential Input Configuration
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| MAX9727EEP+ | 功能描述:音頻放大器 Quad Audio Line Drvr w/3VRMS Output 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: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| MAX9727EEP+T | 功能描述:音頻放大器 Quad Audio Line Drvr w/3VRMS Output 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: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| 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: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| MAX9728AETC+TG104 | 制造商:Maxim Integrated Products 功能描述: |
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