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| 型号： | MAX9728AEUD+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 19/19页 |
| 文件大小： | 0K |
| 描述： | IC AMP AUDIO .06W STER 14TSSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 96 |
| 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： | 60mW x 2 @ 32 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： | 14-TSSOP |
| 封装/外壳： | 14-TSSOP（0.173"，4.40mm 宽） |
| 包装： | 管件 |
MAX9728A/MAX9728B
60mW, DirectDrive, Stereo Headphone
Amplifier with Shutdown
_______________________________________________________________________________________
9
Charge-Pump Capacitor Selection
Use ceramic capacitors with a low ESR for optimum
performance. For optimal performance over the extend-
ed temperature range, select capacitors with an X7R
dielectric. Table 1 lists suggested manufacturers.
Flying Capacitor (C1)
The value of the flying capacitor (see the
Functional
Diagram/Typical Operating Circuits) affects the charge
pump’s load regulation and output resistance. A C1
value that is too small degrades the device’s ability to
provide sufficient current drive, which leads to a loss of
output voltage. Increasing the value of C1 improves load
regulation and reduces the charge-pump output resis-
tance to an extent. See the Output Power vs. Load
Resistance and Charge-Pump Capacitor Size graph in
the
Typical Operating Characteristics. Above 1F, the
on-resistance of the switches and the ESR of C1 and C2
dominate.
Hold Capacitor (C2)
The hold capacitor value (see the
Functional
Diagram/Typical Operating Circuits) and ESR directly
affect the ripple at PVSS. Increasing the value of C2
reduces output ripple. Likewise, decreasing the ESR of
C2 reduces both ripple and output resistance. Lower
capacitance values can be used in systems with low
maximum output power levels. See the Output Power
vs. Load Resistance and Charge-Pump Capacitor Size
graph in the
Typical Operating Characteristics.
Power-Supply Bypass Capacitor (C3)
The power-supply bypass capacitor (see the
Functional
Diagram/Typical Operating Circuits) lowers the output
impedance of the power supply, and reduces the
impact of the MAX9728A/MAX9728Bs’ charge-pump
switching transients. Bypass VDD with C3, the same
value as C1, and place it physically close to the VDD
and PGND pins.
Amplifier Gain
The gain of the MAX9728B amplifier is internally set to
-1.5V/V. All gain-setting resistors are integrated into the
device, reducing external component count. The inter-
nally set gain, in combination with DirectDrive, results in
a headphone amplifier that requires only five small
capacitors to complete the amplifier circuit: two for the
charge pump, two for audio input coupling, and one for
power-supply bypassing (see the
Functional
Diagram/Typical Operating Circuits).
The gain of the MAX9728A amplifier is set externally as
shown in Figure 2, the gain is:
AV = -RF/RIN (V/V)
Choose feedback resistor values in the tens of k
Ω
range. Lower values may cause excessive power dissi-
pation and require impractically small values of RIN for
large gain settings. The high-impedance state of the
outputs can also be degraded during shutdown mode if
an inadequate feedback resistor is used since the
equivalent output impedance during shutdown is
14k
Ω||RF (RF is equal to 30kΩ for the MAX9728B). The
source resistance of the input device may also need to
be taken into consideration. Since the effective value of
RIN is equal to the sum of the source resistance of the
input device and the value of the input resistor connect-
ed to the inverting terminal of the headphone amplifier
(20k
Ω for the MAX9728B), the overall closed-loop gain
of the headphone amplifier can be reduced if the input
resistor is not significantly larger than the source resis-
tance of the input device.
SUPPLIER
PHONE
FAX
WEBSITE
Taiyo Yuden
800-348-2496
847-925-0899
www.t-yuden.com
TDK
847-803-6100
847-390-4405
www.component.tdk.com
Murata
770-436-1300
770-436-3030
www.murata.com
Table 1. Suggested Capacitor Manufacturers
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX9728AEUD+ | 功能描述:音频放大器 60mW DirectDrive 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 |
| MAX9728AEUD+T | 功能描述:音频放大器 60mW DirectDrive 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 |
| MAX9728AEVKIT | 功能描述:放大器 IC 开发工具 MAX9728A/B Eval Kit 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 |
| MAX9728BETC+ | 功能描述:音频放大器 60mW DirectDrive 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 |
| MAX9728BETC+T | 功能描述:音频放大器 60mW DirectDrive 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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