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参数资料
| 型号： | MAX9701ETG+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 5/22页 |
| 文件大小： | 0K |
| 描述： | IC AMP AUDIO PWR 2.2W D 24TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 75 |
| 类型： | D 类 |
| 输出类型： | 2 通道（立体声） |
| 在某负载时最大输出功率 x 通道数量： | 2.2W x 2 @ 4 欧姆 |
| 电源电压： | 2.5 V ~ 5.5 V |
| 特点： | 消除爆音，差分输入，短路和热保护，关闭 |
| 安装类型： | 表面贴装 |
| 供应商设备封装： | 24-TQFN-EP（4x4） |
| 封装/外壳： | 24-WFQFN 裸露焊盘 |
| 包装： | 管件 |
The theoretical best efficiency of a linear amplifier is
78%; however, that efficiency is only exhibited at peak
output powers. Under normal operating levels (typical
music reproduction levels), efficiency falls below 30%,
whereas the MAX9701 still exhibits >80% efficiencies
under the same conditions (Figure 5).
Shutdown
The MAX9701 has a shutdown mode that reduces power
consumption and extends battery life. Driving SHDN low
places the MAX9701 in a low-power (0.1μA) shutdown
mode. Connect SHDN to VDD for normal operation.
Click-and-Pop Suppression
The MAX9701 features comprehensive click-and-pop
suppression that eliminates audible transients on startup
and shutdown. While in shutdown, the H-bridge is in a
high-impedance state. During startup, or power-up, the
input amplifiers are muted and an internal loop sets the
modulator bias voltages to the correct levels, preventing
clicks and pops when the H-bridge is subsequently
enabled. For 40ms following startup, a soft-start function
gradually unmutes the input amplifiers.
Applications Information
Filterless Operation
Traditional Class D amplifiers require an output filter to
recover the audio signal from the amplifier’s PWM out-
put. The filters add cost, increase the solution size of
the amplifier, and can decrease efficiency. The tradi-
tional PWM scheme uses large differential output
swings (2 x VDD(P-P)) and causes large ripple currents.
Any parasitic resistance in the filter components results
in a loss of power, lowering the efficiency.
The MAX9701 does not require an output filter. The
device relies on the inherent inductance of the speaker
coil and the natural filtering of both the speaker and the
human ear to recover the audio component of the
square-wave output. Eliminating the output filter results
in a smaller, less costly, more efficient solution.
Because the frequency of the MAX9701 output is well
beyond the bandwidth of most speakers, voice coil
movement due to the square-wave frequency is very
small. Although this movement is small, a speaker not
designed to handle the additional power can be dam-
aged. For optimum results, use a speaker with a series
inductance >10μH. Typical 8
Ω speakers, for portable
audio applications, exhibit series inductances in the
range of 20μH to 100μH.
Output Offset
Unlike a Class AB amplifier, the output offset voltage of a
Class D amplifier does not noticeably increase quiescent
current draw when a load is applied. This is due to the
power conversion of the Class D amplifier. For example,
an 8mV DC offset across an 8
Ω load results in 1mA extra
current consumption in a Class AB device. In the Class D
case, an 8mV offset into 8
Ω equates to an additional
power drain of 8μW. Due to the high efficiency of the
Class D amplifier, this represents an additional quiescent
current draw of: 8μW/(VDD / 100 x
η), which is on the
order of a few μA.
Selectable Gain
The MAX9701 features four selectable gain settings,
minimizing external component count. Gains of 0dB,
3dB, 12dB, and 18dB are set through gain-select
inputs, GAIN1 and GAIN2. GAIN1 and GAIN2 can be
hard-wired or digitally controlled. Table 2 shows the
suggested gain settings to attain a maximum output
power from a given peak input voltage and given load
at VDD = 3.3V and THD+N = 10%.
MAX9701
1.3W, Filterless, Stereo Class D Audio
Power Amplifier
______________________________________________________________________________________
13
0
30
20
10
50
40
90
80
70
60
100
0
0.1
0.2
0.4
0.3
0.5
EFFICIENCY vs. OUTPUT POWER
OUTPUT POWER (W)
EFFICIENCY
(%)
MAX9701
CLASS AB
VDD = 3.3V
f = 1kHz
RL - 8
Ω
Figure 5. MAX9701 Efficiency vs. Class AB Efficiency
GAIN1
GAIN2
GAIN
(dB)
INPUT
(VRMS)
RL
(
Ω)
POUT
(mW)
0
+18
0.305
4
1100
1
0
+12
0.615
4
1100
01
+6
1.213
4
1100
11
0
2.105
4
1100
0
+18
0.345
8
725
1
0
+12
0.686
8
725
01
+6
1.360
8
725
11
0
2.705
8
725
Table 2. Gain Settings
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX9701ETG+ | 功能描述:音频放大器 1.3W Filterless Class D Audio Amp 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 |
| MAX9701ETG+T | 功能描述:音频放大器 1.3W Filterless Class D Audio Amp 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 |
| MAX9701ETG-T | 制造商:Maxim Integrated Products 功能描述:1.3W, FILTERLESS, STEREO CLASS D AUDIO POWER - Tape and Reel |
| MAX9701EUP | 制造商:Maxim Integrated Products 功能描述:1.3W, FILTERLESS, STEREO CLASS D AUDIO POWER - Rail/Tube |
| MAX9701EUP-T | 制造商:Maxim Integrated Products 功能描述:1.3W, FILTERLESS, STEREO CLASS D AUDIO POWER - Tape and Reel |
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