SPM0208HD5-2 Knowles Acoustics, SPM0208HD5-2 Datasheet - Page 6

• Manufacturer Part Number: SPM0208HD5-2
• Description: Microphone
• Manufacturer: Knowles Acoustics

Specifications of SPM0208HD5-2

• Transducer Function: Microphone
• Device Type: Microphone
• Directivity: Omni
• Connector Type: SMD
• Sensitivity: -22
• Length: 4.72mm
• Supply Voltage: 3.6V
• Supply Voltage Max: 3.6V
• Filter Type: Standard
• Supply Voltage Min: 1.5V
• Drain Current Max: 0.35mA

9. RECOMMENDED INTERFACE CIRCUIT
Se t t ing Ga in For m ula s:
Gain of non- inver t ing Op- Am p is det erm ined as:
High- pass- filt er Corner Frequency:
D e sir e d Ga in
Unit y Gain ( 0dB)
20dB Gain
Adj ust able Gain
Term 3 = Ground
Term 4 = V
G= 1+ { R1 / ( R2 + R3) }
C.F. = 1 / { 2* * ( R2 + R3) * C1}
Knowles Acoust ics, a division of Knowles
dd
Pin 2 Te r m ina t ion M e t hod
Tie Term inal 2 direct ly t o Out put ( Term inal 1) .
Tie Term inal 2 t hrough C1 ( 0.47uF) t o Gr ound.
Add R3 and C1. Use for m ulas pr ovided t o calculat e
set t ings, or cont act Knowles for support .
V+
Elect r onics, LLC.
Term 2 = Gain Control
R2 = 2.4k
R3 (set by customer)
C1 (set by customer)
Gain( dB) = 20 * log( G)
SPM0208HD5
R1 = 22k
Revision: C
Term 1 = Output
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Vout