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参数资料
| 型号： | MAX9722BETE+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 2/21页 |
| 文件大小： | 0K |
| 描述： | IC AMP AUDIO .13W STER AB 16TQFN |
| 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： | 130mW x 2 @ 32 欧姆 |
| 电源电压： | 2.4 V ~ 5.5 V |
| 特点： | 消除爆音，差分输入，短路和热保护，关闭 |
| 安装类型： | 表面贴装 |
| 供应商设备封装： | 16-TQFN-EP（3x3） |
| 封装/外壳： | 16-WFQFN 裸露焊盘 |
| 包装： | 管件 |
MAX9722A/MAX9722B
2) The voltage coefficient of the DC-blocking capaci-
tor contributes distortion to the reproduced audio
signal as the capacitance value varies and the
function of the voltage across the capacitor
changes. The reactance of the capacitor dominates
at frequencies below the -3dB point and the voltage
coefficient appears as frequency-dependent distor-
tion. Figure 5 shows the THD+N introduced by two
different capacitor dielectric types. Note that below
100Hz, THD+N increases rapidly. The combination
of low-frequency attenuation and frequency-depen-
dent distortion compromises audio reproduction in
portable audio equipment that emphasizes low-fre-
quency effects such as in multimedia laptops, MP3,
CD, and DVD players. By eliminating the DC-block-
ing capacitors through DirectDrive technology,
these capacitor-related deficiencies are eliminated.
Charge Pump
The MAX9722A/MAX9722B feature a low-noise charge
pump. The 600kHz switching frequency is well beyond
the audio range and, thus, does not interfere with the
audio signals. Also, the 600kHz switching frequency
does not interfere with the 450kHz AM transceivers.
The switch drivers feature a controlled switching speed
that minimizes noise generated by turn-on and turn-off
transients. By limiting the switching speed of the
charge pump, the di/dt noise caused by the parasitic
bond wire and trace inductance is minimized. Although
not typically required, additional high-frequency noise
attenuation can be achieved by increasing the value of
C2 (see Typical Application Circuit).
Click-and-Pop Suppression
In conventional single-supply audio amplifiers, the out-
put-coupling capacitor is a major contributor of audible
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 to GND. This results in a DC shift across the
capacitor, which, in turn, appears as an audible tran-
sient at the speaker. Since the MAX9722A/MAX9722B
do not require output-coupling capacitors, this problem
does not arise.
Additionally, the MAX9722A/MAX9722B feature exten-
sive click-and-pop suppression that eliminates any audi-
ble transient sources internal to the device. The
Power-Up/Down Transient graph in the Typical
Operating Characteristics shows that there is minimal
DC shift and no spurious transients at the output upon
startup or shutdown.
In most applications, the output of the preamplifier driving
the MAX9722A/MAX9722B has a DC bias of typically half
the supply. At startup, the input-coupling capacitor is
charged to the preamplifier’s DC-bias voltage through the
feedback resistor of the MAX9722A/MAX9722B, resulting
in a DC shift across the capacitor and an audible
click/pop. Delaying the rise of SHDN 4 to 5 time con-
stants (80ms to 100ms) based on RIN and CIN, relative to
the startup of the preamplifier, eliminates this click/pop
caused by the input filter.
5V, Differential Input, DirectDrive, 130mW
Stereo Headphone Amplifiers with Shutdown
10
______________________________________________________________________________________
0
-30
10
100
1k
10k
100k
LOW-FREQUENCY ROLLOFF
(RL = 16
Ω)
-24
-27
-12
-15
-18
-21
-6
-9
-3
FREQUENCY (Hz)
ATTENUATION
(dB)
DirectDrive
330
μF
220
μF
100
μF
33
μF
Figure 4. Low-Frequency Attenuation for Common DC-Blocking
Capacitor Values
ADDITIONAL THD+N DUE
TO DC-BLOCKING CAPACITORS
FREQUENCY (Hz)
THD+N
(%)
10k
1k
100
0.001
0.01
0.1
1
10
0.0001
10
100k
TANTALUM
ALUM/ELEC
Figure 5. Distortion Contributed by DC-Blocking Capacitors
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX9722BETE+ | 功能描述:音频放大器 DirectDrive 130mW 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 |
| MAX9722BETE+G104 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX9722BETE+T | 功能描述:音频放大器 DirectDrive 130mW 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 |
| MAX9722BETE+WG104 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX9722BETE-T | 功能描述:音频放大器 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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