SPM0408HE5H-SB データシートの表示（PDF） - Unspecified
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SPM0408HE5H-SB
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SPM0408HE5H-SB Datasheet PDF : 10 Pages
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SPM0408HE5H‐SB
9. RECOMMENDED INTERFACE CIRCUIT
V+
Term 4 = Vdd
R1 = 22kΩ
Vout
Term 1 = Output
Term 3 = Ground
R2 = 2.4kΩ
Term 2 = Gain Control
R3 (set by customer)
C1 (set by customer)
Desired Gain
Unity Gain (0dB)
20dB Gain
Adjustable Gain
Pin 2 Termination Method
Tie Terminal 2 directly to Output (Terminal 1).
Tie Terminal 2 through C1 (0.47uF) to Ground.
Add R3 and C1. Use formulas provided to calculate
settings, or contact Knowles for support.
Setting Gain Formulas:
Gain of non‐inverting Op‐Amp is determined as:
G=1+ {R1 / (R2 + R3)}
High‐pass‐filter Corner Frequency:
C.F. = 1 / {2*π*(R2 + R3) * C1}
Gain(dB) = 20 * log(G)
Knowles Acoustics, a division of Knowles Electronics,
LLC.
Revision: B
6 of 10
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