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參數(shù)資料
| 型號： | MAX9700BEVKIT |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 3/20頁 |
| 文件大小： | 0K |
| 描述： | EVAL KIT FOR MAX9700 |
| 產品培訓模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標準包裝： | 1 |
| 放大器類型： | D 類 |
| 輸出類型： | 1-通道（單聲道） |
| 在某負載時最大輸出功率 x 通道數(shù)量： | 1.6W x 1 @ 6 歐姆 |
| 電源電壓： | 2.5 V ~ 5.5 V |
| 工作溫度： | 0°C ~ 70°C |
| 板類型： | 完全填充 |
| 已用 IC / 零件： | MAX9700，MAX9712 |
| 已供物品： | 板 |
MAX9700
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 (0.1A) shutdown
mode. Connect
SHDN to VDD 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 VDD
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 >10H. Typical 8Ω speakers exhibit series
inductances in the 20H to 100H 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
AMPLITUDE
(dB
μ
V/m)
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)
EFFICIENCY
(%)
MAX9700
CLASS AB
VDD = 3.3V
f = 1kHz
RL - 8
Ω
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| MAX9700CEBC | 制造商:Maxim Integrated Products 功能描述:1.2W LOW EMI FILTERLESS CLASS D - Rail/Tube |
| MAX9700CEBC+ | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX9700CEBC+T | 功能描述:音頻放大器 1.2W L-EMI Filterles Class D Audio Amp RoHS:否 制造商:STMicroelectronics 產品: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: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| MAX9700CEBC-T | 功能描述:音頻放大器 RoHS:否 制造商:STMicroelectronics 產品: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: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| MAX9700CETB | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
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