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| 型号： | MAX9720AEBE+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 7/21页 |
| 文件大小： | 0K |
| 描述： | IC AMP AUDIO .05W STER AB 16UCSP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 系列： | DirectDrive®, SmartSense™ |
| 类型： | AB 类 |
| 输出类型： | 耳机，2-通道（立体声） |
| 在某负载时最大输出功率 x 通道数量： | 50mW x 2 @ 32 欧姆 |
| 电源电压： | 1.8 V ~ 3.6 V |
| 特点： | 消除爆音，短路保护和热保护，关闭 |
| 安装类型： | 表面贴装 |
| 供应商设备封装： | 16-UCSP（2x2） |
| 封装/外壳： | 16-WFBGA，CSPBGA |
| 包装： | 带卷 (TR) |
Applications Information
Power Dissipation
Under normal operating conditions, linear power ampli-
fiers can dissipate a significant amount of power. The
maximum power dissipation for each package is given
in the Absolute Maximum Ratings section under
Continuous Power Dissipation or can be calculated by
the following equation:
where TJ(MAX) is +150°C, TA is the ambient temperature,
and
θJA is the reciprocal of the derating factor in °C/W as
specified in the Absolute Maximum Ratings section. For
example,
θJA of the TSSOP package is +106.38°C/W.
The MAX9720 has two power dissipation sources: the
charge pump and the two amplifiers. If the power dissipa-
tion for a given application exceeds the maximum
allowed for a given package, either reduce VDD, increase
load impedance, decrease the ambient temperature, or
add heat sinking to the device. Large output traces
improve the maximum power dissipation in the package.
Thermal overload protection limits total power dissipa-
tion in the MAX9720. When the junction temperature
exceeds +140°C, the thermal protection circuitry dis-
ables the amplifier output stage. The amplifiers are
enabled once the junction temperature cools by 15°C,
resulting in a pulsing output under continuous thermal
overload conditions.
Output Power
The MAX9720 is specified for the worst-case condi-
tion—when both inputs are in phase. Under this condi-
tion, the amplifiers simultaneously draw current from
the charge pump, leading to a slight loss in headroom
of VSS. In typical stereo audio applications, the left and
right signals present differences in both magnitude and
phase, subsequently leading to an increase in the max-
imum attainable output power. Figure 8 shows the two
extreme cases for in- and out-of-phase. In reality, the
available power lies between these extremes.
Powering Other Circuits from
a Negative Supply
An additional benefit of the MAX9720 is the internally
generated, negative supply voltage (PVSS). PVSS is the
negative supply for the MAX9720 headphone amplifiers.
PVSS can power other devices within a system. Limit the
current drawn from PVSS to 5mA. Exceeding this affects
the operation of the headphone amplifiers. A typical
application is a negative supply to adjust the contrast of
LCD modules.
The charge-pump voltage at PVSS is roughly propor-
tional to VDD and is not a regulated voltage. Consider
the charge-pump output impedance when powering
other devices from PVSS. See the Charge-Pump Output
Impedance
graph
in
the
Typical
Operating
Characteristics. Use 2.2F charge-pump capacitors for
the highest output power; 1F or lower capacitors can
also be used for most applications. See the Output
Power vs. Load Resistance and Charge-Pump
Capacitance graph for details of the output power vs.
capacitor size.
Component Selection
Input Filtering
The input capacitor (CIN), in conjunction with the
MAX9720 input impedance, forms a highpass filter that
removes the DC bias from an incoming signal (see
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 impedance value
given in the Electrical Characteristics. Chose 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 whose dielectrics
have low-voltage coefficients, such as tantalum or alu-
minum electrolytic. Capacitors with high-voltage coeffi-
cients, such as ceramics, may result in increased
distortion at low frequencies.
f
RC
dB
IN IN
=
3
1
2
π
P
TT
DISSPKG MAX
J MAX
A
JA
()
=
θ
MAX9720
50mW, DirectDrive, Stereo Headphone
Amplifier with SmartSense and Shutdown
______________________________________________________________________________________
15
100
0.001
040
20
80
120
160
140
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. OUTPUT POWER
0.01
0.1
1
10
OUTPUT POWER (mW)
THD+N
(%)
60
100
VDD = 3V
AV = -1V/V
f = 1kHz
RL = 16
OUTPUTS
IN PHASE
SINGLE-
CHANNEL
OUTPUTS
OUT OF
PHASE
Figure 8. THD+N vs. Output Power with Inputs In-/Out-of-Phase
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX9720AEUE | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX9720AEUE+ | 功能描述:音频放大器 50mW DirectDrive Headphone Amplifier RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
| MAX9720AEUE+T | 功能描述:音频放大器 50mW DirectDrive Headphone Amplifier RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
| MAX9720BEBE | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX9720BEBE+ | 制造商:Maxim Integrated Products 功能描述:AUD AMP HDPH 2CH STEREO 0.05W CLS-AB 16UCSP - Rail/Tube |
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