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參數(shù)資料
| 型號： | MAX7349AEG+ |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 17/29頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC CNTRL SW SOUND 24-QSOP |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準(zhǔn)包裝： | 50 |
| 應(yīng)用： | 聲卡，播放器，記錄器 |
| 接口： | I²C |
| 電源電壓： | 2.4 V ~ 3.6 V |
| 封裝/外殼： | 24-SSOP（0.154"，3.90mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 24-QSOP |
| 包裝： | 管件 |
| 安裝類型： | 表面貼裝 |
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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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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX7349AEG+ | 功能描述:外圍驅(qū)動器與原件 - PCI Low-EMI Key Switch & Sounder Controller RoHS:否 制造商:PLX Technology 工作電源電壓: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:FCBGA-1156 封裝:Tray |
| MAX7349AEG+T | 功能描述:外圍驅(qū)動器與原件 - PCI Low-EMI Key Switch & Sounder Controller RoHS:否 制造商:PLX Technology 工作電源電壓: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:FCBGA-1156 封裝:Tray |
| MAX7349AEG-T | 功能描述:外圍驅(qū)動器與原件 - PCI Low-EMI Key Switch & Sounder Controller RoHS:否 制造商:PLX Technology 工作電源電壓: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:FCBGA-1156 封裝:Tray |
| MAX7349ANG | 制造商:Maxim Integrated Products 功能描述:2-WIRE INTERFACED LOW-EMI KEY SWITCHES AND SO - Rail/Tube |
| MAX7349ATG+ | 功能描述:外圍驅(qū)動器與原件 - PCI Low-EMI Key Switch & Sounder Controller RoHS:否 制造商:PLX Technology 工作電源電壓: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:FCBGA-1156 封裝:Tray |
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