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| 型号： | MAX9820ETB+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 13/13页 |
| 文件大小： | 0K |
| 描述： | IC AMP AUD HDPHE 95MW 10TDFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1 |
| 系列： | DirectDrive® |
| 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： | 95mW x 2 @ 32 欧姆 |
| 电源电压： | 2.7 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： | 10-TDFN-EP（3x3） |
| 封装/外壳： | 10-WFDFN 裸露焊盘 |
| 包装： | 标准包装 |
| 产品目录页面： | 1392 (CN2011-ZH PDF) |
| 其它名称： | MAX9820ETB+TDKR |
GND (Figure 1). With no DC component, there is no
need for the large DC-blocking capacitors. The
MAX9820 charge pump requires two small ceramic
capacitors, conserving board space, reducing cost,
and improving the frequency response of the head-
phone amplifier.
Charge Pump
The MAX9820 features a low-noise charge pump. The
500kHz (typ) charge pump switching frequency is well
beyond the audio range and does not interfere with
audio signals.
Click-and-Pop Suppression
In conventional single-supply audio amplifiers, the out-
put-coupling capacitor contributes significantly to audi-
ble clicks and pops. Upon startup, the amplifier
charges the coupling capacitor to its bias voltage, typi-
cally half the supply. Likewise, on shutdown, the capac-
itor is discharged. This results in a DC shift across the
capacitor, which appears as an audible transient at the
speaker. Since DirectDrive biases the outputs at
ground, this problem does not arise. Additionally, the
MAX9820 features extensive click-and-pop suppres-
sion that eliminates any audible transient sources inter-
nal to the device.
RF Susceptibility
Modern audio systems are often subject to RF radiation
from sources such as wireless and cellular phone net-
works. Although the RF radiation is out of the audio
band, many signals, GSM signals in particular, contain
bursts or modulation at audible frequencies. Most ana-
log amplifiers demodulate the low-frequency envelope,
adding noise to the audio signal. The MAX9820 archi-
tecture addresses the RF susceptibility problem by
rejecting RF noise and preventing it from coupling into
the audio band.
MAX9820
DirectDrive Headphone Amplifier
with External Gain
_______________________________________________________________________________________
9
VOUT
CONVENTIONAL DRIVER OUTPUT WAVEFORMS
VDD
GND
VDD/2
VDD
VOUT
MAX9820 OUTPUT WAVEFORMS
VDD
-VDD
GND
2VDD
Figure 1. Conventional Driver Output Waveform vs. MAX9820
Output Waveform
RF IMMUNITY vs. FREQUENCY
MAX9820
fig02
FREQUENCY (GHz)
RF
IMMUNITY
(dBV)
2.45
1.90
1.35
-100
-80
-60
-40
-20
0
-120
0.8
3.00
LEFT CHANNEL
RIGHT CHANNEL
Figure 2. MAX9820 RF Susceptibility
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX9820EVKIT+ | 功能描述:音频 IC 开发工具 MAX9820 Eval Kit RoHS:否 制造商:Texas Instruments 产品:Evaluation Kits 类型:Audio Amplifiers 工具用于评估:TAS5614L 工作电源电压:12 V to 38 V |
| MAX982CPA | 功能描述:校验器 IC Dual Comparator / Reference RoHS:否 制造商:STMicroelectronics 产品: 比较器类型: 通道数量: 输出类型:Push-Pull 电源电压-最大:5.5 V 电源电压-最小:1.1 V 补偿电压（最大值）:6 mV 电源电流（最大值）:1350 nA 响应时间: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SC-70-5 封装:Reel |
| MAX982CPA+ | 功能描述:校验器 IC Dual Comparator / Reference RoHS:否 制造商:STMicroelectronics 产品: 比较器类型: 通道数量: 输出类型:Push-Pull 电源电压-最大:5.5 V 电源电压-最小:1.1 V 补偿电压（最大值）:6 mV 电源电流（最大值）:1350 nA 响应时间: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SC-70-5 封装:Reel |
| MAX982CSA | 功能描述:校验器 IC Dual Comparator / Reference RoHS:否 制造商:STMicroelectronics 产品: 比较器类型: 通道数量: 输出类型:Push-Pull 电源电压-最大:5.5 V 电源电压-最小:1.1 V 补偿电压（最大值）:6 mV 电源电流（最大值）:1350 nA 响应时间: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SC-70-5 封装:Reel |
| MAX982CSA+ | 功能描述:校验器 IC Dual Comparator / Reference RoHS:否 制造商:STMicroelectronics 产品: 比较器类型: 通道数量: 输出类型:Push-Pull 电源电压-最大:5.5 V 电源电压-最小:1.1 V 补偿电压（最大值）:6 mV 电源电流（最大值）:1350 nA 响应时间: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SC-70-5 封装:Reel |
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