規 格 承 認 書
PECIFICATION FOR APPROVAL
客 戶
CUSTOMER
項 目
ITEM
型 號
：
：
立创
驻极½咪头（ECM）
TYPE
：
GMI9745P-38DB
描述
DESCRIPTION
：
φ9.7
x H4.5mm
插针
-38dB
客戶料號
CUSTOMER NO.
：
規 格 書 號
SPECIFICATION NO.：
版 本
EDITION NO.
日 期
DATE
：
：
≤2.2K
Ω
≤0.5mA
S/N:
≥58
dBA
V1.0
2019-12-27
客戶承認
CUSTOMER CONFIRM AND SIGN
檢查
TESTED BY
審核
CHECKED BY
承認
APPROVED BY
東莞市赢海電子有限公司
DONGUAN INGHAI ELECTRONICS CO.,LTD
½½
ISSUED BY
審查
CHECKED BY
確認
APPROVED BY
周明
刘承成
地址：廣東省東莞市長安鎮廈邊元灶頭工業區 16-6 號
電話 /
TEL：0769-83060958
傳真
/ FAX： 0769-81608993
網址：HTTP://WWW.INGHAI.COM
1/5
A. SCOPE
This specification applies electret condenser microphone,
GMI9745P-38DB
B. SPECIFICATION
■Test
condition: RL=2.2KΩ
No.
1
2
VS=4.5V
Unit
TEMP=25℃±2℃
Specification
Omnidirectional
Related humidity=65±5%
Condition
Item
Directivity
Sensitivity
Symbol
S
Vs
dB
V
-38±3
4.5
f=1KHz,1Pa
0dB=1V/ ubar
3
Standard operating voltage
4
5
6
Output impedance
Frequency
Max operating voltage
Zout
KΩ
Hz
V.
≤2.2
100-10000
10
f=1KHz, 1Pa
7
Sensitivity reduction
△S-Vs
dB
-3
f=1KHz, 1Pa
vs=4.5VDC to 3.0VDC
8
Max. current consumption
I
DSS
mA
≤0.5
9
10
11
12
13
14
Signal to noise ration
Max. Sound Pressure
Level
Operation temp.
Storage temp.
Dimension
Terminal
S/N
S.P.L
dBA
dB
℃
≥58
110
-20 ~+70
-40 ~+80
φ9.7x4.5
Terminal
See appearance drawing
See appearance drawing
℃
mm
We use “Pascal(Pa)”indication of sensitivity as per the recommendation of I.E.C.(International Electro technical
Commission)
TheSensitivity of “Pa” will increase 20dB comparing with “ubar” indication
Example: -60dB(0dB=1V/ubar) =-40dB(1V/Pa)
2/5
B. TYPICAL FREQUENCY RESPONSE CURVE
D. APPEARANCE DRAWING
E. MEASUREMENT CIRCUIT
FET impedance
Converter
Term.1
RL
ECM
Unit
Term.2
Shielb case
RL=2.2K
Ω
(External resistor)
+Vs
Ground
C
Output
3/5
F.
可靠性试验
Reliability Test
经过以下所有试验在
20℃的条件下放½ 3
小时后,麦克风的灵敏度与试验前比较变化在
3dB
以
内
After any following tests, the sensitivity of the microphone to be within
±3dB
of initial sensitivity
after 3hours of conditioning at 20℃
5-1
振动试验
周波数
1/Frequency1:10Hz½55Hz
Vibration
振幅/Amplitude:1.52mm
变化/Change
of Frequency:1 octave/min
3
方向,各
2
小时/hours
in each of 3 axes
5-2
高温试验
+80±5℃
for 96 hours
Dry Heat
5-3
½温试验
-40±5℃
for 96 hours
Dry Cold
5-4
高温高湿试验
90%½95%RH,+60±5℃
for 96 hours
Damp Heat
5-5
温度循环试验
-20℃
25℃
70℃
Temperature cycles
(2h) (1h) (2h) (1h) (2h)×10 cycles
5-6
跌½试验
Height:1m
Packing drop test
顺序:三个面各跌
10
次
Procedure:10 times from each of 3 axises
5-7
温度冲击试验
-20℃
70℃
Temperature impact test
30min 30s
30min ×10 cycles
5-8
静电冲击试验
6000V(contact), 10000V(air)
×10
axises
Electrostatic shock test
备注
Note
6-1
工½温度范围
Operation Temperature -20℃½70℃
6-2
储存温度范围
Storage Temperature
-40℃½80℃
G.
焊接条件
Soldering Condition
7-1
焊接½用
90W
的烙铁。
The soldering copper of a type of 90W shall be applied
焊接条件
Soldering Condition.
7-2
电烙铁表面温度
320±10℃
The temperature of the working surface of the soldering copper shall be 320±10℃
7-3
焊接时把麦克风嵌入散热½力强的金属块内。
ECM shall be soldered fixed on the metal block(heat sink)which has the higher radiation effects said
heat sink
Shall contact with of ECM.
4/5
7-4
焊接时间控制在
2½3
秒内。
time for each terminal shall be 2½3 sec.
7-5
焊接后不½出现针孔。
The pinhole after soldering shall be avoided.
7-6
静电容易破坏麦克风必须采取措½避免（电烙铁接地，戴静电环等。
）
ECM may easily destroyed by the static electricity and the countermeasure for eliminating the static
electricity (the ground for soldering copper, for worktable and for human body) shall be executed.
7-7
散热板½状
Shape of heat sink
7-8
固定部孔½状
Shape of hole at fixed part
5/5
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