BEST SOUND ELECTRONICS Approved Version 1.1 1 Analog SMD Microphone Specification Version 1.1 BSE CO., LTD 58B-4L, 626-3, GOZAN-DONG, NAMDONG-KU INCHON-SI. KOREA TEL :(8232) 550-1780 FAX :(8232) 554-6206 4 0 5 8 1 7 - MODEL NO. : (S)SOB-413S42-VRC DIRECTIVITY : OMNI-DIRECTIONAL CONFIDENTIAL SPECIFICATION OF ELECTRET CONDENSER MICROPHONE ( Ramone ) Prepared Checked Approved Name Sign. Prepared Checked Approved Name J.M.Kim C.W.Kim C.D.Song Sign. BSE NOKIA
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SPECIFICATION OF ELECTRET CONDENSER MICROPHONE ( … · 1. INTRODUCTION This specification shall be applied to SMD (Surface Mounting Device) ECM (Electret Condenser Microphone) which
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1. INTRODUCTION This specification shall be applied to SMD (Surface Mounting Device) ECM (Electret Condenser Microphone) which has endurablereflow temperature.
1 Sensitivity ( after 2×reflow) S f=1, S.P.L =1Pa, 0=1V/Pa -45 -42 -39
2 Output impedance ZOUT f= 1 1.4 1.8 2.2
3 Current Consumption IDSS VCC=2.0V , RL = 2.2 500
4 Signal to Noise Ratio S/N f=1, S.P.L =1Pa (A-Weighted ) 58
6 Decreasing Voltage ΔS-VS VCC=2.0V to 1.5V -46 -43 -40
Diaphragm (Ni or Au coating)
Case (Au coating)
PCB (IC)
BASE2
Spacer
Back Electret
BASE1
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6. TYPICAL FREQUENCY RESPONSE CURVE
- Far Field Measurement Condition (microphone unit only)
Temperature : 23 ± 2 Bias Voltage : 2.0V ( with 2.2 series resistor )Acoustic stimulus : 1Pa ( 94 SPL at 1 ) at 50 from the loud-speaker.
The loud-speaker must be calibrated to make a flat frequency response input signal Position : The frequency response of microphone unit measured at 50 from the loud-speaker
1 0 0 1 0 0 0 1 0 0 0 0- 1 0
- 8
- 6
- 4
- 2
0
2
4
6
8
1 0
]
5. MEASUREMENT CIRCUIT
IC 1
2
ECM Unit
MIC.CASE
Terminal 2
Terminal 1
RL
C
1
Output
Power Supply Vs
Earth
RL:2.2 (external resistance)
C1
R
Varistor
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7. MECHANICAL CHARACTERISTICS
7.1 MICROPHONE
7.2 MATERIAL LIST FOR MICROPHONE
1.3±0.1
4.0±
0.1
# Parts Sub-parts Substances or Grade
FRP R1566W, Panasonic
FET TF252C, Sanyo
MLCC 3.3nF, size0603
Varistor 15pF, size0603
Resistor 330Ω , size 0603,
3 BASE2 Metal Brass + Ni & Au plating
Film PTFE film
Membrane PPS film + Au sputtered layer
PWB
BASE1
Back-Electrets
Spacer
1
Diaphragm
Case
SAC305
2
Solder
Insulator
Metal
Film
PA6T
Metal
German Silver + Ni plating 4
Phosphor Bronze(C5210-SH) + Ni plating6
7 Metal Brass(C2680 1/4H) + Ni & Au plating
5 PI
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8. RELIABILITY TEST
Item Test Method andconditions
Duration EvaluationStandard
8.1 Low storage Temperature
-40Temp.change 1/min
168h The sensitivity difference shall be within ± 3 from initial sensitivity. Measurements to be taken after 2h recovery time at ambient condition
8.2 Dry heatstorage
+85 Dry Heat.Temp. change 1/min
168h The sensitivity difference shall be within ± 3 from initial sensitivity. Measurements to be taken after 2h recovery time at ambient condition
8.3 Cold Operation
Sen. Measurement at-30 Temp. change 1/min
168h The sensitivity difference shall be within ± 3 from initial sensitivity.Measurement must be done when the temperature is –30or measured within 60 seconds of removal fromLow temperature
8.4 Dry HeatOperation
Sen. Measurement at+70 Temp. change 1/min
168h The sensitivity difference shall be within ± 3 from initial sensitivity.Measurement must be done when the temperature is +70or measured within 60 seconds of removal fromhigh temperature.
8.5 Chang of Temperature
-40/+85 change time<3minBut long enough so thatthe change can not be considered as a temperature shock.
100cycles,1cycle 30+30min
The sensitivity difference shall be within ± 3 from initial sensitivity.Measurements to be taken after 2h recovery time at ambient condition
8.6 Damp Heat Cyclic
+25/+55 90 to 95RH 6cycles, 1cycle: 24hr The sensitivity difference shall be within ± 3 from initial sensitivity. Measurements to be taken after 2h recovery time at ambient condition
8.7 Free fall Durability The part in its test box is dropped onto concrete from 1.5m height:1. Two times on each side (2×6).2. One drop from each edge (1×12)3. Two drops from each corner(2×8)
1.5m (12+12+16) dropsOnto concrete Total of 40 drops on each unit
The sensitivity difference shall be within ± 3 from initial sensitivity.
8.8 Impact Durability( Free fall repeated)
The part in its test box is dropped 300 times onto the steel base from 1m height , with checks initially and after Every 50 drops.:
300 drops, 1m height,Checks initial and afterEvery 50 drops
The sensitivity difference shall be within ± 3 from initial sensitivity.
dwell times, 2h cycle time 2. Random free fall ( 50drops)3.Damp heat cycle, 20/50%RH to
75/75%RH, 1h dwell and constanttimes, 4h cycle time
4. Random free fall ( 50drops)
1. Free fall1m
2. Temp. cycling120 cycles ( 240h)
3. Damp heat cycle50 cycles (200h)
- Recovery time 2h
The sensitivity difference shall be within ± 3 from initial sensitivity.Measurements to be taken after 2h recovery time at ambient condition
8.10 ElectrostaticDischarge
The microphone under test must be discharged between each ESD exposure with ground. ( contact : ± 8,air : ± 15)
10 exposure toEach pole whileThe other pole isgrounded
Normal operation after test.
8.12 DC Voltage · 6 VDC is applied to the Vs and ground pins of the microphone for 5 hours· Power supply output impedance should be 500 mΩ, current limited to 5 A
For 5 hoursOnce
No smoke or fire must occur
8.11 EMC RF immunity level is below 35relative to the reference level in the frequency range 10-2.1
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9. Environmental Characteristics for Acoustic Specification