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| 型号： | MAX9724CETC+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 2/19页 |
| 文件大小： | 0K |
| 描述： | IC AMP AUDIO .063W STER 12TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 100 |
| 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： | 63mW x 2 @ 32 欧姆 |
| 电源电压： | 2.5 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： | 12-TQFN EP（3x3） |
| 封装/外壳： | 12-WQFN 裸露焊盘 |
| 包装： | 管件 |
| 配用： | MAX9724AEVKIT+-ND - EVALUATION KIT FOR MAX9724A/B MAX9724DEVKIT+-ND - KIT EVAL FOR MAX9724D |
MAX9724C/MAX9724D
the MAX9724 addresses the problem of the RF suscep-
tibility by rejecting RF noise and preventing it from cou-
pling into the audio band.
The RF susceptibility of an amplifier can be measured
by placing the amplifier in an isolated chamber and sub-
jecting it to an electric field of known strength. If the
electric field is modulated with an audio band signal, a
percentage of the modulated signal is demodulated and
amplified by the device in the chamber. Figure 2 shows
the signal level at the outputs of an unoptimized amplifi-
er and the MAX9724. The test conditions are shown in
Table 1.
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, typically half
the supply. Likewise, on shutdown, the capacitor is dis-
charged. This results in a DC shift across the capacitor,
which appears as an audible transient at the speaker.
Since the MAX9724C/MAX9724D do not require output-
coupling capacitors, this problem does not arise.
Additionally, the MAX9724C/MAX9724D feature exten-
sive click-and-pop suppression that eliminates any audi-
ble transient sources internal to the device.
Typically, the output of the device driving the
MAX9724C/MAX9724D has a DC bias of half the supply
voltage. At startup, the input-coupling capacitor, CIN, is
charged to the preamplifier’s DC bias voltage through
the MAX9724C/MAX9724D input resistor, RIN, and a
series 15k
Ω resistor. This DC shift across the capacitor
results in an audible click-and-pop. Delay the rise of
SHDN 4 to 5 time constants based on RIN x 15k
Ω x CIN
to eliminate clicks-and-pops caused by the input filter.
Shutdown
The MAX9724C/MAX9724D feature a < 0.1A, low-
power shutdown mode that reduces quiescent current
consumption and extends battery life for portable appli-
cations. Drive SHDN low to disable the amplifiers and
the charge pump. In shutdown mode, the amplifier out-
put impedance is set to 14k
Ω||RF (RF is 30kΩ for the
MAX9724D). The amplifiers and charge pump are
enabled once SHDN is driven high.
Applications Information
Power Dissipation
Under normal operating conditions, linear power ampli-
fiers can dissipate a significant amount of power. The
maximum power dissipation for each package is given
in the
Absolute Maximum Ratings section under
Continuous Power Dissipation or can be calculated by
the following equation:
where TJ(MAX) is +150°C, TA is the ambient tempera-
ture, and
θJA is the reciprocal of the derating factor in
P
TT
DISSPKG MAX
J MAX
A
JA
()
=
θ
Low RF Susceptibility DirectDrive Stereo Head-
phone Amplifier with 1.8V Compatible Shutdown
10
______________________________________________________________________________________
TEST PARAMETER
SETTING
RF Field Strength
50V/m
RF Modulation Type
Sine wave
RF Modulation Index
100%
RF Modulation Frequency
1kHz
Table 1. RF Susceptibility Test Conditions
MAX9724
fig02
RF CARRIER FREQUENCY (MHz)
AMPLIFIER
OUTPUT
AMPLITUDE
(dBV)
1600
2100
1100
600
-80
-60
-40
-20
0
20
40
RF SUSCEPTIBLE
AMPLIFIER
MAX9724
62dB IMPROVEMENT
AT 850MHz
39dB IMPROVEMENT
AT 900MHz
67dB IMPROVEMENT
AT 1800MHz
49dB IMPROVEMENT
AT 1900MHz
-100
100
2600
Figure 2. RF Susceptibility of the MAX9724 and a Typical Headphone Amplifier
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX9724CETC+ | 功能描述:音频放大器 Low RF Susceptible Headphone Amplifier 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 |
| MAX9724CETC+T | 功能描述:音频放大器 Low RF Susceptible Headphone Amplifier 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 |
| MAX9724CEVKIT+ | 制造商:Maxim Integrated Products 功能描述:LOW RF SUSCEPTIBILITY DIRECTDRIVE S - Boxed Product (Development Kits) |
| MAX9724DEBC+T | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX9724DEBC+TG45 | 功能描述:音频放大器 Low RF Susceptible Headphone Amplifier 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 |
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