Knowles Acoustics
www.knowlesacoustics.com
4
Document: SP0102N
Last Revision Date: 09-2003
+
-
+
Vref
R1
R2
External Gain (set by
customer) = -R1/R2
Term. 4
Term. 3
Term. 1
•
•
•
Dotted Section
Represents SiSonic
Microphone
Recommended Interface Circuit
Tested to greater than 5,000g (IEC 68-2-27, Ea).
Mechanical Shock
Microphone is tested to 5 passes through reflow oven, with microphone
mounted upside-down under conditions of 260ºC for 30 seconds
maximum.
Reflow
Tested to 8kV direct contact discharge or 15kV air discharge as
specified by IEC 1000-4-2, level 3 and level 4.
Electrostatic
Discharge
Microphone unit must maintain sensitivity after storage at –40ºC for
1,000 hours. (IEC 68-2-1 Test Aa)
Low Temperature
Storage Test
Microphone unit must maintain sensitivity after storage at +105ºC for
1,000 hours. (IEC 68-2-2 Test Ba)
High Temperature
Storage Test
After test conditions are performed, the sensitivity of the microphone
shall not deviate more than 3dB from its initial value.
Note:
Microphone unit must operate within sensitivity specifications for 16
hours at –40ºC. (IEC 68-2-1 Test Aa)
Low Temperature
Operating Test
Microphone unit must operate under test condition: 4 cycles, from 20
to 2,000 Hz in each direction (x,y,z), 48 minutes, using peak
acceleration of 20g (+20%, -0%). (MIL 883E, method 2007.2, A)
Vibration Test
Tested under Bias at 85ºC/85% R.H. for 270 hours. (JESD22-A101A-B)
Humidity Test
Microphone unit must operate within sensitivity specifications for 16
hours at 105ºC. (IEC 68-2-2 Test Ba)
High Temperature
Operating Test
Microphone unit must operate when exposed to air-to-air thermal
shock 100 cycles, from –40ºC to +125ºC. (IEC 68-2-4),
Thermal Shock
Reliability
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