參數(shù)資料
型號(hào)： MAX9700
廠商： Maxim Integrated Products, Inc.
元件分類： 運(yùn)動(dòng)控制電子
英文描述： Single Audio Amplifier
中文描述： 單音頻放大器
文件頁(yè)數(shù)： 11/19頁(yè)
文件大小： 532K
代理商： MAX9700
M
1.2W, Low-EMI, Filterless,
Class D Audio Amplifier
______________________________________________________________________________________
11
Shutdown
The MAX9700 has a shutdown mode that reduces power
consumption and extends battery life. Driving
SHDN
low
places the MAX9700 in a low-power (0.1μA) shutdown
mode. Connect
SHDN
to V
DD
for normal operation.
Click-and-Pop Suppression
The MAX9700 features comprehensive click-and-pop
suppression that eliminates audible transients on start-
up 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, pre-
venting clicks and pops when the H-bridge is subse-
quently enabled. For 35ms 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 output. The
filters add cost, increase the solution size of the amplifi-
er, and can decrease efficiency. The traditional PWM
scheme uses large differential output swings (2 x V
DD
peak-to-peak) and causes large ripple currents. Any
parasitic resistance in the filter components results in a
loss of power, lowering the efficiency.
The MAX9700 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 MAX9700 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
speakers exhibit series
inductances in the 20μH to 100μH range.
Power-Conversion Efficiency
Unlike a class AB amplifier, the output offset voltage of
a class D amplifier does not noticeably increase quies-
cent current draw when a load is applied. This is due to
Figure 3. MAX9700 EMI Spectrum
30.0
60.0
80.0
100.0 120.0 140.0 160.0 180.0
280.0 300.0
220.0
200.0
240.0 260.0
10.0
15.0
20.0
25.0
30.0
35.0
40.0
45.0
50.0
A
μ
V
FREQUENCY (MHz)
Figure 4. MAX9700 Outputs with No Input Signal
VIN = 0V
OUT-
OUT+
VOUT+ - VOUT- = 0V
Figure 5. MAX9700 Efficiency vs. Class AB Efficiency
0
30
20
10
50
40
90
80
70
60
100
0
0.1
0.2
0.4
0.6
0.3
0.5
0.7
EFFICIENCY vs. OUTPUT POWER
OUTPUT POWER (W)
E
MAX9700
CLASS AB
V
DD
= 3.3V
f = 1kHz
R
L
- 8
相關(guān)PDF資料
PDF描述
MAX9700AEBC-T Single Audio Amplifier
MAX9700AETB Single Audio Amplifier
MAX9700AEUB Single Audio Amplifier
MAX9700BEBC-T Single Audio Amplifier
MAX9700BETB Single Audio Amplifier
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX97000EVKIT+ 功能描述:音頻 IC 開(kāi)發(fā)工具 MAX97000 Eval Kit RoHS:否 制造商:Texas Instruments 產(chǎn)品:Evaluation Kits 類型:Audio Amplifiers 工具用于評(píng)估:TAS5614L 工作電源電壓:12 V to 38 V
MAX97000EWA+T 功能描述:音頻放大器 Audio Subsystem w/ Mono Class D 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
MAX97001EVKIT+ 功能描述:音頻 IC 開(kāi)發(fā)工具 MAX97001 Eval Kit RoHS:否 制造商:Texas Instruments 產(chǎn)品:Evaluation Kits 類型:Audio Amplifiers 工具用于評(píng)估:TAS5614L 工作電源電壓:12 V to 38 V
MAX97001EWP+T 功能描述:音頻放大器 Audio Subsystem w/ Mono Class D 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
MAX97002EVKIT+ 功能描述:音頻 IC 開(kāi)發(fā)工具 MAX97002 Eval Kit RoHS:否 制造商:Texas Instruments 產(chǎn)品:Evaluation Kits 類型:Audio Amplifiers 工具用于評(píng)估:TAS5614L 工作電源電壓:12 V to 38 V
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