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參數(shù)資料
| 型號(hào)： | MAX9727EEP+ |
| 廠商： | Maxim Integrated Products |
| 文件頁(yè)數(shù)： | 2/13頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC AMP AUDIO QUAD AB DIFF 20QSOP |
| 標(biāo)準(zhǔn)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(diǎn)： | 消除爆音，差分輸入，關(guān)閉，熱保護(hù) |
| 安裝類型： | 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： | 管件 |
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MAX9727
Inverting Amplifier Configuration
Figure 3 shows a single channel of the MAX9727 con-
figured as an inverting amplifier. External resistors RF
and RIN set the voltage gain of the amplifier as follows:
where AV is the desired voltage gain in V/V.
RF can be either fixed or variable, allowing the use of a
digitally controlled potentiometer to alter the gain under
software control.
Active Filter Configuration
When the MAX9727 is used as a line driver to provide
outputs that feed audio equipment (notebooks, desk-
tops, receivers, and set-top boxes) with a digital-to-
analog converter (DAC) used as an audio input source,
it is often desirable to eliminate any high-frequency
quantization noise produced by the DAC output before
it reaches the load. This high-frequency noise can
cause the input stages of the line-in equipment to
exceed slew-rate limitations or create excessive EMI
emissions on the cables between devices.
In order to suppress this noise, and to provide a 2VRMS
standard audio output level from a single 5V supply,
the MAX9727 can be configured as an active lowpass
filter. The
Functional Diagram/Typical Application
Circuit shows the MAX9727 connected as 2-pole
Rauch/Multiple Feedback filter with a passband gain of
6dB and a -3dB (below passband) cutoff frequency of
approximately 27kHz (see Figure 4 for Gain vs.
Frequency plot).
Input Filter
The input capacitor CIN, in conjunction with RIN, forms
a highpass filter that removes the DC bias from an
incoming signal. The AC-coupling capacitor allows the
amplifier to bias the signal to an optimum DC level.
Assuming zero-source impedance, the -3dB point of
the highpass filter is given by:
Setting f-3dB too high affects the low-frequency
response of the amplifier. Use capacitors with
dielectrics that have low-voltage coefficients, such as
tantalum or aluminum electrolytic. Capacitors with high-
voltage coefficients, such as ceramics, can increase
distortion at low frequencies.
Charge-Pump Capacitor Selection
Use capacitors with an ESR of less than 100m for
optimum performance. Low-ESR ceramic capacitors
minimize the output resistance of the charge pump. For
best performance over the extended temperature
range, select capacitors with an X7R dielectric.
f
RC
dB
IN IN
=
3
1
2
π
A
R
V
F
IN
=
Quad Audio Line Driver with 3VRMS Output
10
______________________________________________________________________________________
IN_-
RIN
IN_+
OUT_
RF
MAX9727
Figure 3. Inverting Amplifier Configuration
ACTIVE FILTER GAIN vs. FREQUENCY
MAX9727
fig04
FREQUENCY (kHz)
GAIN
(dB)
10
-12
-9
-6
-3
0
3
6
9
-15
1
100
Figure 4. MAX9727 Active Filter Gain vs. Frequency
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相關(guān)代理商/技術(shù)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(fēng)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(fēng)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(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: |
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