spm0408le5h Knowles Electronics, spm0408le5h Datasheet - Page 6

• Manufacturer Part Number: spm0408le5h
• Description: ?mini??sisonic??microphone Amplified?zero?height?with?enhanced?rf?protection?? Halogen?free
• Manufacturer: Knowles Electronics

9. RECOMMENDED INTERFACE CIRCUIT
Setting Gain Formulas:
Gain of non‐inverting Op‐Amp is determined as:
High‐pass‐filter Corner Frequency:
Desired Gain
Unity Gain (0dB)
20dB Gain
Adjustable Gain
Pins 3 4 5 7 8 = Ground
Pins 3, 4, 5, 7, 8 = Ground
G=1+ {R1 / (R2 + R3)}
C.F. = 1 / {2*π*(R2 + R3) * C1}
Pin 6 = V
Knowles Acoustics, a division of Knowles Electronics,
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Termination Method
Tie Gain directly to Output.
Tie Gain through C1 (0.47uF) to Ground.
Add R3 and C1. Use formulas provided to calculate settings, or
contact Knowles for support.
V+
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LLC.
Pin 2 = Gain Control
Pin 2 = Gain Control
R2 = 2.4kΩ
R3 (set by customer)
C1 (set by customer)
Gain(dB) = 20 * log(G)
SPM0408LE5H‐TB
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)
R1 = 22kΩ
g( )
Revision: B
Pin 1 = Output
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Vout