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| 型号： | MAX9706ETX+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 11/25页 |
| 文件大小： | 0K |
| 描述： | IC AMP AUDIO 2.3W STER+1 36TQFN |
| 标准包装： | 2,500 |
| 系列： | DirectDrive® |
| 类型： | D 类 |
| 输出类型： | 2-通道（立体声）带立体声耳机和超低音器 |
| 在某负载时最大输出功率 x 通道数量： | 2.3W x 3 @ 4 欧姆; 95mW x 2 @ 16 欧姆 |
| 电源电压： | 4.5 V ~ 5.5 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： | 36-TQFN 裸露焊盘（6x6） |
| 封装/外壳： | 36-WFQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
MAX9706/MAX9707
3-Channel, 2.3W, Filterless Class D Amplifiers
with Active Crossover
______________________________________________________________________________________
19
Headphone Sense Input (HPS)
The headphone sense input (HPS) monitors the head-
phone jack, and automatically configures the MAX9706
based upon the voltage applied at HPS. A voltage of
less than 0.8V sets the MAX9706 to speaker mode and
disables the headphone amplifiers. A voltage of greater
than 2V disables the speaker amplifiers and enables
the headphone amplifiers. The HPS input features a
built-in 65ms debounce period to prevent audible
“chatter” when inserting or removing headphones.
For automatic headphone detection, connect HPS to
the control pin of a 3-wire headphone jack as shown in
Figure 9. With no headphone present, the output
impedance of the headphone amplifier pulls HPS to
less than 0.8V. When a headphone plug is inserted into
the jack, the control pin is disconnected from the tip
contact and HPS is pulled to VDD through the internal
600k
pullup. When driving HPS from an external logic
source, drive HPS low when the MAX9706 is shut
down. Place a 10k
resistor in series with HPS and the
headphone jack to ensure high ESD protection.
Click-and-Pop Suppression
The MAX9706/MAX9707 feature 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.
Current Limit and Thermal Protection
The MAX9706/MAX9707 feature current limiting and
thermal protection to protect the device from short cir-
cuits and overcurrent conditions. If the current on any
output exceeds the current limit (1.5A typ) the internal
circuitry shuts off for 50s then turns back on. If the
overload condition is still present after 50s, the internal
circuitry shuts off again. The amplifier output pulses in
the event of a continuous overcurrent condition. The
headphone amplifier outputs become high impedance
in the event of an overcurrent condition. The speaker
amplifier’s current-limiting protection clamps the output
current without shutting down the outputs.
The MAX9706/MAX9707 feature thermal-shutdown pro-
tection with temperature hysteresis. A rising die tem-
perature shuts down the device at +150°C. When the
die cools down to +143°C, the device is enabled. The
outputs pulsate as the temperature fluctuates between
the thermal limits.
Shutdown
The MAX9706/MAX9707 feature a 0.1A shutdown
mode that reduces power consumption to extend bat-
tery life. Driving SHDN low disables the drive amplifiers,
bias circuitry, and charge pump and sets the head-
phone amplifier output impedance to 1.4k
.
Applications Information
Filterless Class D 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 MAX9706/MAX9707 do not require an output filter.
The devices rely on the inherent inductance of the
speaker coil and the natural filtering of both the speak-
er 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 MAX9706/MAX9707 out-
put 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 speak-
er not designed to handle the additional power can be
damaged. For optimum results, use a speaker with a
series inductance >10H. Typical 8
speakers for
portable audio applications exhibit series inductances
in the 20H to 100H range.
MAX9706
600k
1.4k
1.4k
VDD
HPS
SHDN
HPL
HPR
SHUTDOWN
CONTROL
Figure 9. HPS Configuration
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| MAX9706EVKIT | 功能描述:放大器 IC 开发工具 RoHS:否 制造商:International Rectifier 产品:Demonstration Boards 类型:Power Amplifiers 工具用于评估:IR4302 工作电源电压:13 V to 23 V |
| MAX9707ETX+ | 功能描述:音频放大器 Integrated Circuits (ICs) 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 |
| MAX9707ETX+T | 功能描述:音频放大器 Integrated Circuits (ICs) 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 |
| MAX9708ECB+D | 制造商:Maxim Integrated Products 功能描述:AUD AMP SPKR 1CH MONO/2CH STEREO 42W/21W CLS-D 64TQFP EP - Rail/Tube |
| MAX9708ECB+TD | 制造商:Maxim Integrated Products 功能描述:AUD AMP SPKR 1CH MONO/2CH STEREO 42W/21W CLS-D 64TQFP EP - Tape and Reel |
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