一、先认识这位 “听力担当” 的基本信息

• 尺寸超迷你：只有 3.76×2.24×1.1mm，比一颗小黄豆还小，特别适合手机、TWS 耳机这类追求轻薄的设备，随便找个角落就能 “藏” 起来，不占空间。
• 输出很简单：单端模拟输出，就像一根线直接传声音，电路设计不复杂，工程师用起来省心，不管是做耳机还是智能音箱，接起来都方便。
• 防干扰高手：自带射频屏蔽，就像给麦克风穿了件 “防干扰盔甲”。在地铁站、商场这种信号乱七八糟的地方，它也能专心 “听” 声音，手机、智能手表用它，通话和录音都清晰。
• 环保小标兵：符合 RoHS 标准还无卤素，对人体和环境都友好。给儿童手表、智能家居设备用，不用担心有害物质，用着放心。

二、核心参数解读：为什么选它？

（一）“听力” 有多好？—— 灵敏度和信噪比

• 灵敏度：-42dB（1kHz 时）
  • 就像人耳能听到 whisper（耳语）的程度，小声说话它也能捕捉到。TWS 耳机用它，哪怕用户轻声说话，对方也能听得清楚；智能音箱用它，在房间角落喊 “唤醒词”，它也能迅速反应。
• 信噪比 58dB (A)
  • 相当于在嘈杂的食堂，它能把你说的话和周围噪音分开。便携式录音笔用它，录课堂笔记、会议内容，背景噪音小，声音更清晰；手机拍视频时用它收音，风声、键盘声等干扰少，视频音质更好。

（二）“耐力” 怎么样？—— 功耗和电压

• 电流消耗 120μA（2.0V 供电时）
  • 特别省电，就像小夜灯一样耗电极低。智能手环、智能手表这种靠电池续命的设备用它，不用担心太耗电；便携电子词典用它，长时间查单词发音，电池也扛得住。
• 工作电压 1.6 – 3.6V
  • 适应范围广，从低电压的穿戴设备到稍高电压的笔记本电脑都能用。平板电脑用它，不管是充电时还是电池快没电时，它都能稳定工作。

（三）“抗造” 能力如何？—— 各种环境考验

• 工作温度 – 40℃~100℃
  • 超耐寒耐热，在东北冬天室外用的智能温度计、夏天厨房的智能家电用它，都不怕温度极端。车载电子设备用它，夏天暴晒、冬天低温，它依然能正常 “听” 声音。
• 防静电（ESD）：接触放电 ±8kV
  • 就像穿了 “防静电外套”，组装时不小心碰到静电，或者用户用手摸设备接口，它也不容易被 “电坏”。笔记本电脑、平板电脑在生产和使用中，难免会有静电，用它更可靠。
• 抗振动和跌落
  • 经过振动测试（20 – 2000Hz，20G 加速度）和 1.5 米跌落测试，运动相机、户外便携音箱用它，就算跟着用户爬山、跑步颠簸，或者不小心摔了，它也能正常工作。

（四）“音质” 好不好？—— 失真和过载

• 总谐波失真（THD）0.1%（典型值）
  • 声音还原度高，几乎没有杂音。智能钢琴陪练设备用它，能准确捕捉琴键声音，判断指法是否正确；录音笔用它，录出来的声音和真人说话几乎一样。
• 声学过载点（AOP）132dB
  • 能承受很大的声音，比如演唱会现场、工地噪音环境，它不会 “被震晕”。安防摄像头用它，哪怕附近有鞭炮声、汽车鸣笛声，也能清楚录下关键声音。

（五）“频率响应” 如何？—— 听声音的 “范围”

• 从 100Hz 到 10000Hz 都能覆盖，就像人耳能听到的大部分声音它都能捕捉。
  • 100Hz 低频：能听到大鼓、低音炮的声音，智能音箱用它，低音更饱满；
  • 10000Hz 高频：能听到小鸟叫声、键盘敲击声，笔记本电脑视频通话用它，对方的声音更清晰。

三、不同设备选它的 “独家理由”

（一）Smart Phones（智能手机）

• 优势：体积小不占主板空间，射频屏蔽防手机信号干扰，信噪比高让通话更清晰。
• 场景：打电话、录视频、语音备忘录都能用，哪怕在地铁里打电话，对方也能听清你说啥。

（二）TWS Headsets（真无线耳机）

• 优势：低功耗省电，单端输出设计简单，灵敏度高让通话更轻松。
• 场景：用户戴着耳机跑步时说话，它能清楚捕捉声音；打电话时，对方不会觉得声音小。

（三）Smart Speakers（智能音箱）

• 优势：全向拾音（四面八方的声音都能听），AOP 高不怕大声唤醒，频率响应宽让语音指令更准确。
• 场景：在客厅各个角落喊 “播放音乐”，它都能听到；家里来客人说话声音大，它也不会 “误听” 指令。

（四）Wearable Electronics（可穿戴设备）

• 优势：体积小好集成，低功耗不费电，-40℃~100℃温度范围适应各种天气。
• 场景：智能手表接电话、智能手环语音备忘录，哪怕冬天戴着手套说话，它也能捕捉到。

（五）Portable Electronics（便携电子设备）

• 优势：耐振动和跌落，适合随身带的设备；低功耗，电池能用更久。
• 场景：便携录音笔、手持翻译机，用户出差路上用，不怕颠簸和摔落，录音质量有保障。

（六）Smart Home Electronics（智能家居设备）

• 优势：抗干扰能力强，在有多个家电的环境中也能准确听指令；环保无卤素，适合家庭使用。
• 场景：智能门锁语音开锁、智能灯光语音控制，哪怕家里电视开着，它也能听清你的指令。

（七）Laptop Computers（笔记本电脑）

• 优势：兼容 1.6 – 3.6V 电压，适应笔记本不同供电状态；防静电，减少组装和使用中的故障。
• 场景：视频会议、在线上课，收音清晰，对方不会觉得有杂音；打字时键盘声干扰小。

四、使用小技巧：让它发挥最佳性能

• 给它 “配个电容”：在电源引脚附近接一个 0.1μF 的陶瓷电容，就像给它 “稳稳压”，减少电源噪音，手机、耳机里用的时候，音质更纯净。
• 输出线 “短一点”：从麦克风到芯片的线尽量短，就像声音传输的路越短越顺畅，减少干扰，笔记本电脑、平板电脑布线时注意这一点。
• 别 “洗它”“吹它”：回流焊后不要用液体洗电路板，也别对着它的音孔吹气，不然可能 “弄坏耳朵”，生产和维修时要注意。

五、总结：选它就像给设备装了个 “全能小耳朵”

BG3722AT 麦克风，又小又灵敏，还抗干扰、省电、耐造，从手机到耳机，从音箱到智能家居，各种设备都能用。选它，让你的产品 “听” 得更清楚、更可靠！

BG3722AT Microphone: A Small-sized Powerhouse Equipping Devices with Sensitive “Ears”

I. Basic Information of this “Hearing Expert”

• Ultra-mini size: Only 3.76×2.24×1.1mm, smaller than a soybean, particularly suitable for thin and light devices like smartphones and TWS earphones. It can be easily “hidden” in any corner without taking up much space .
• Simple ou1tput: Single-ended analog output is like a direct sound transmission line, making the circuit design uncomplicated and saving engineers’ effort. It’s convenient to connect whether for earphones or smart speakers .
• Anti-inte2rference master: Equipped with RF shielding, similar to an “anti-interference armor” for the microphone. In messy signal environments like subway stations or shopping malls, it can still focus on “listening” to sounds. Smartphones and smartwatches using it will have clear calls and recordings .
• Eco-frien3dly model: Compliant with RoHS standards and halogen-free, friendly to both humans and the environment. For children’s watches and smart home devices, there’s no need to worry about harmful substances, ensuring safe use .

II. Inter4pretation of Core Parameters: Why Choose It?

(A) How Sensitive Is Its “Hearing”? – Sensitivity and Signal-to-Noise Ratio

• Sensitivity: -42dB (at 1kHz)
  It can capture even whispers, just like human ears. TWS earphones using it allow users’ soft voices to be clearly heard by the other party; smart speakers using it can quickly respond to “wake-up words” even when spoken in a corner of the room .
• Signal-to8-Noise Ratio 58dB(A)
  It’s equivalent to distinguishing your words from surrounding noise in a noisy canteen. Portable voice recorders using it will have clear recordings with less background noise for classroom notes and meeting contents; mobile phones using it for video shooting will have better audio quality with reduced interference from wind and keyboard sounds .

(B) How 8Is Its “Endurance”? – Power Consumption and Voltage

• Current Consumption 120μA (at 2.0V supply)
  Extremely power-saving, similar to a night light. Smart bracelets, smartwatches, and other battery-powered devices using it won’t worry about excessive power consumption; portable electronic dictionaries using it can withstand long-term pronunciation checks .
• Operating8 Voltage 1.6 – 3.6V
  Wide adaptation range, suitable for both low-voltage wearable devices and higher-voltage laptops. Tablets using it can work stably whether charging or when the battery is almost dead .

(C) How 8Is Its “Durability”? – Various Environmental Tests

• Operating Temperature -40℃~100℃
  Extremely cold and heat resistant, suitable for smart thermometers used outdoors in northeast winters and smart home appliances in kitchens during summer. Vehicle-mounted electronic devices using it can work normally in summer sun exposure and winter low temperatures .
• ESD Prote5ction: Contact Discharge ±8kV
  Like wearing an “anti-static coat”, it’s not easily “damaged by electricity” during assembly due to accidental static electricity or when users touch device interfaces. Laptops and tablets are more reliable with it during production and use .
• Vibration10 and Drop Resistance
  Passed vibration tests (20 – 2000Hz, 20G acceleration) and 1.5m drop tests. Action cameras and outdoor portable speakers using it can work normally even when 颠簸 during mountain climbing, running, or accidental falls .

(D) How 10Is Its “Sound Quality”? – Distortion and Overload

• Total Harmonic Distortion (THD) 0.1% (typical value)
  High sound 还原度 with almost no noise. Smart piano practice devices using it can accurately capture piano key sounds to judge whether fingerings are correct; voice recorders using it produce sounds almost identical to real human speech .
• Acoustic 8Overload Point (AOP) 132dB
  Can withstand loud sounds, such as concert scenes or construction site noise, without being “dazed”. Security cameras using it can clearly record key sounds even with firecrackers or car horns nearby .

(E) How 8Is Its “Frequency Response”? – The “Range” of Hearing

• Covers from 100Hz to 10000Hz, similar to most sounds audible to human ears:
  • 100Hz low frequency: Captures drum and subwoofer sounds, making smart speakers using it have fuller bass;
  • 10000Hz high frequency: Captures bird calls and keyboard tapping sounds, making laptop video calls using it have clearer voices from the other party .

III. “Uni9que Reasons” for Choosing It in Different Devices

(A) Smart Phones

• Advantages: Small size doesn’t occupy motherboard space, RF shielding prevents mobile phone signal interference, and high SNR ensures clear calls .
• Scenarios3: Used for calling, video recording, and voice memos. Even making calls in the subway, the other party can hear you clearly.

(B) TWS Headsets

• Advantages: Low power consumption saves electricity, simple single-ended output design, and high sensitivity makes calls easier .
• Scenarios2: When users talk while running with headphones on, it can clearly capture the voice; during calls, the other party won’t feel the voice is too low.

(C) Smart Speakers

• Advantages: Omnidirectional sound pickup (hears sounds from all directions), high AOP is not afraid of loud wake-ups, and wide frequency response makes voice commands more accurate .
• Scenarios8: Calling “play music” from any corner of the living room, it can hear; when there are guests speaking loudly at home, it won’t “misunderstand” commands.

(D) Wearable Electronics

• Advantages: Small size for easy integration, low power consumption, and -40℃~100℃ temperature range adapts to various weather .
• Scenarios5: Smartwatches for calls and smart bracelets for voice memos can capture sounds even when speaking with gloves on in winter.

(E) Portable Electronics

• Advantages: Vibration and drop resistance suitable for portable devices; low power consumption extends battery life .
• Scenarios10: Portable voice recorders and handheld translators used by users on business trips are not afraid of 颠簸 and falls, ensuring recording quality.

(F) Smart Home Electronics

• Advantages: Strong anti-interference ability to accurately hear commands in environments with multiple home appliances; eco-friendly and halogen-free for family use .
• Scenarios4: Smart door locks for voice unlocking and smart lights for voice control can hear your commands clearly even when the TV is on at home.

(G) Laptop Computers

• Advantages: Compatible with 1.6 – 3.6V voltage to adapt to different power supply states of laptops; anti-static to reduce assembly and usage failures .
• Scenarios8: Clear sound pickup for video conferences and online classes without background noise; minimal keyboard sound interference during typing.

IV. Tips for Use: Maximizing Its Performance

• “Pair it with a capacitor”: Connect a 0.1μF ceramic capacitor near the power pin, like “stabilizing the voltage” for it, reducing power noise and making the sound quality purer in mobile phones and earphones .
• “Keep the11 output line short”: The line from the microphone to the chip should be as short as possible, like a shorter sound transmission path being smoother to reduce interference. Pay attention to this when wiring laptops and tablets .
• “Don’t wa12sh or blow it”: Do not wash the circuit board with liquid after reflow soldering, and do not blow into its sound hole, otherwise, it may “damage the ear”. Pay attention during production and maintenance .

V. Conclu13sion: Choosing It Is Like Equipping Devices with an “All-around Small Ear”

The BG3722AT microphone is small, sensitive, anti-interferent, power-saving, and durable, applicable to various devices from mobile phones to earphones, speakers, and smart homes. Choosing it allows your products to “hear” more clearly and reliably!