GTA2718B-3
GTA2718B-3 是一款小封裝、單端輸出的底部端口模擬 MEMS 麥克風(fēng)，由一個(gè) MEMS 傳感器和一個(gè)低噪聲級(jí) ASIC（專用集成電路）組成。
優(yōu)勢(shì)與特點(diǎn)
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2.75×1.85×1.0 毫米底部端口
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IPX8 級(jí)防水特性
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單端輸出
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高信噪比（SNR）
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窄靈敏度范圍 ±1 分貝
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射頻屏蔽
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兼容標(biāo)準(zhǔn)表面貼裝回流焊技術(shù)（SMD）
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符合 RoHS 標(biāo)準(zhǔn)且無(wú)鹵素
性能參數(shù)
| Parameter | Symbol | Condition | Min | Nom. | Max | Unit |
| Sensitivity | S | f=1kHz, Pin=1Pa, 0dB=1V/Pa | -39 | -38 | -37 | dB |
| Operating Voltage | VDD | 2.3 | 2.75 | 3.6 | V | |
| Directivity | Omni-directional | |||||
| Polarity | Sound pressure increase | Output voltage increase | ||||
| Sensitivity vs. Voltage | ΔS | Vs= 3.6V to 1.6V | ＜0.5 | dB | ||
| Output Impedance | ZOUT | f=1kHz | 400 | Ω | ||
| Current Consumption | I | 2.3 V to 3.6V | 135 | 200 | μA | |
| S/N Ratio | S/N | f=1kHz, BW=20-20kHz, A-Weighted | 64 | 66 | dBA | |
| Total Harmonic Distortion | THD | 94dB SPL @1KHz | 0.05 | 0.5 | % | |
| 125dBSPL @1KHz | 1 | % | ||||
| Acoustic Overload Point | AOP | THD 10%@1KHz | 129 | dBSPL | ||
| Power Supply Rejection | PSR | 100mVpp Square wave @217Hz, A-weighted | -102 | -90 | dB | |
| Power Supply Rejection Ratio | PSRR | 200mVpp Sinewave @1KHz | 60 | 71 | dB | |
| DC output | VDC | 1.1 | V | |||
| Output load | Cload | 100 | pF | |||
| Rload | 8 | KΩ | ||||
| Note：Frequency response, sensitivity and current consumption are tested by 100% on product line. | ||||||
應(yīng)用實(shí)例
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頭戴耳機(jī)
