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参数资料
| 型号： | MAX7348AEP+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 17/29页 |
| 文件大小： | 0K |
| 描述： | IC KEY SWITCH 2WIRE 20-QSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 应用： | 声卡，播放器，记录器 |
| 接口： | I²C |
| 电源电压： | 2.4 V ~ 3.6 V |
| 封装/外壳： | 20-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 20-QSOP |
| 包装： | 带卷 (TR) |
| 安装类型： | 表面贴装 |
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MAX7347/MAX7348/MAX7349
2-Wire Interfaced Low-EMI Key Switch
and Sounder Controllers
24
______________________________________________________________________________________
Audio Transducers
The sounder output is designed to drive a standard, low-
cost piezo transducer directly without further buffering.
Piezo transducers appear as a capacitive load of typical-
ly 10nF. If a resistive or inductive sounder is used, such
as a small loudspeaker, fit a coupling capacitor between
the sounder output and the transducer. For example, if a
32Ω speaker is used, connect the positive side of a 22F
electrolytic capacitor to the sounder output, the negative
side of the capacitor to one end of the speaker, and the
other end of the speaker to GND.
The sounder output can also drive a power amplifier for
higher sound levels. In this case, it is usually desirable
to include a lowpass filter before the speaker to convert
the square-wave tones to something closer to a sinu-
soid. The recommended cutoff frequency of this filter is
around 3kHz. An example circuit is shown in Figure 12,
which uses the uncommitted op amp of the MAX4366
bridge power amplifier to implement a third-order
Chebyshev lowpass filter.
REGULAR KEY-PRESS
EVENT
GHOST-KEY
EVENT
KEY-SWITCH MATRIX
Figure 10. Ghost-Key Phenomenon
KEY-SWITCH MATRIX
EXAMPLES OF VALID THREE-KEY COMBINATIONS
Figure 11. Valid Three-Key Combinations
Chip Information
PROCESS: BiCMOS
21.5k
Ω
32.4k
Ω
22nF
SOUNDER
OUTPUT
SHUTDOWN
2.61k
Ω
68nF
21.5k
Ω
220pF
IN-
IN+
SHDN
BIAS
10k
Ω
10k
Ω
50k
Ω
50k
Ω
VCC
OUT-
OUT+
0.22
μF
16
Ω
MAX4366
Figure 12. Third-Order Chebyshev Lowpass Filter and Output Stage
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| MAX7348AEP+ | IC KEY SWITCH 2WIRE 20-QSOP |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX7349 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:2-Wire Interfaced Low-EMI Key Switch and Sounder Controllers |
| MAX7349AEG | 功能描述:外围驱动器与原件 - PCI Low-EMI Key Switch & Sounder Controller RoHS:否 制造商:PLX Technology 工作电源电压: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:FCBGA-1156 封装:Tray |
| MAX7349AEG+ | 功能描述:外围驱动器与原件 - PCI Low-EMI Key Switch & Sounder Controller RoHS:否 制造商:PLX Technology 工作电源电压: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:FCBGA-1156 封装:Tray |
| MAX7349AEG+T | 功能描述:外围驱动器与原件 - PCI Low-EMI Key Switch & Sounder Controller RoHS:否 制造商:PLX Technology 工作电源电压: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:FCBGA-1156 封装:Tray |
| MAX7349AEG-T | 功能描述:外围驱动器与原件 - PCI Low-EMI Key Switch & Sounder Controller RoHS:否 制造商:PLX Technology 工作电源电压: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:FCBGA-1156 封装:Tray |
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