參數(shù)資料
型號(hào)： MAX9758ETJ+
廠商： Maxim Integrated Products
文件頁(yè)數(shù)： 15/31頁(yè)
文件大?。?/td> 0K
描述： IC AMP AUDIO PWR 2.3W AB 32TQFN
標(biāo)準(zhǔn)包裝： 60
系列： DirectDrive®
類型： AB 類
輸出類型： 2-通道（立體聲）帶立體聲耳機(jī)
在某負(fù)載時(shí)最大輸出功率 x 通道數(shù)量： 2.3W x 2 @ 3 歐姆; 130mW x 2 @ 16 歐姆
電源電壓： 4.5 V ~ 5.5 V
特點(diǎn)： 消除爆音，短路保護(hù)和熱保護(hù)，關(guān)機(jī)，音量控制
安裝類型： 表面貼裝
供應(yīng)商設(shè)備封裝： 32-TQFN-EP（5x5）
封裝/外殼： 32-WFQFN 裸露焊盤
包裝： 管件
MAX9756/MAX9757/MAX9758
Output Power (Headphone Amplifier)
The headphone amplifiers have been specified for the
worst-case scenario—when both inputs are in phase.
Under this condition, the drivers simultaneously draw
current from the charge pump, leading to a slight loss
in headroom of VSS. In typical stereo audio applica-
tions, the left and right signals have differences in both
magnitude and phase, subsequently leading to an
increase in the maximum attainable output power.
Figure 14 shows the two extreme cases for in and out
of phase. In reality, the available power lies between
these extremes.
Power Supplies
The MAX9756/MAX9757/MAX9758 have different sup-
plies for each portion of the device, allowing for the opti-
mum combination of headroom and power dissipation
and noise immunity. The speaker amplifiers are pow-
ered from PVDD. PVDD ranges from 4.5V to 5.5V. The
headphone amplifiers are powered from HPVDD and
VSS. HPVDD is the positive supply of the headphone
amplifiers and ranges from 3V to 5.5V. VSS is the nega-
tive supply of the headphone amplifiers. Connect VSS to
CPVSS. The charge pump is powered by CPVDD.
CPVDD ranges from 3V to 5.5V and should be the same
potential as HPVDD. The charge pump inverts the volt-
age at CPVDD, and the resulting voltage appears at
CPVSS. The remainder of the device is powered by VDD.
Component Selection
Input Filtering
The input capacitor (CIN), in conjunction with the ampli-
fier input resistance (RIN), forms a highpass filter that
removes the DC bias from an incoming signal (see the
Typical Application Circuit). 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:
RIN is the amplifier’s internal input resistance value
given in the Electrical Characteristics. Choose CIN such
that f-3dB is well below the lowest frequency of interest.
Setting f-3dB too high affects the amplifier’s low-fre-
quency response. Use capacitors with low-voltage
coefficient dielectrics, such as tantalum or aluminum
electrolytic. Capacitors with high-voltage coefficients,
such as ceramics, may result in increased distortion at
low frequencies.
BIAS Capacitor
BIAS is the output of the internally generated DC bias
voltage. The BIAS bypass capacitor, CBIAS, improves
PSRR and THD+N by reducing power supply and other
noise sources at the common-mode bias node, and
also generates the startup/shutdown DC bias wave-
forms for the speaker amplifiers. Bypass BIAS with a
1F capacitor to GND.
Charge-Pump Capacitor Selection
Use capacitors with an ESR less than 100m
for opti-
mum performance. Low-ESR ceramic capacitors mini-
mize the output resistance of the charge pump. For
best performance over the extended temperature
range, select capacitors with an X7R dielectric. Table 6
lists suggested manufacturers.
f
RC
dB
IN IN
=
3
1
2
π
2.3W Stereo Speaker Amplifiers and DirectDrive
Headphone Amplifiers with Automatic Level Control
22
______________________________________________________________________________________
OUTPUT POWER (mW)
THD+N
(%)
160
140
100 120
60 80
20 40
0.01
0.1
1
10
100
0.001
0
200
180
HPVDD = 5V
RL = 16
OUTPUTS 180
° OUT OF PHASE
OUTPUTS IN PHASE
Figure 14. Total Harmonic Distortion Plus Noise vs. Output
Power with Inputs In/Out of Phase (Headphone Mode)
Table 6. Suggested Capacitor Manufacturers
SUPPLIER
PHONE
FAX
WEBSITE
Taiyo Yuden
800-384-2496
800-925-0899
www.t-yuden.com
TDK
807-803-6100
847-390-4405
www.component.tdk.com
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX9758ETJ+ 功能描述:音頻放大器 Integrated Circuits (ICs) 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
MAX9758ETJ+T 功能描述:音頻放大器 Integrated Circuits (ICs) 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
MAX9759ETE+ 功能描述:音頻放大器 3.2W Low-EMI Class D 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
MAX9759ETE+T 功能描述:音頻放大器 3.2W Low-EMI Class D 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
MAX9759EUE+ 制造商:Maxim Integrated Products 功能描述:- Rail/Tube
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