SPM0103ND3-2 데이터 시트보기 (PDF) - Unspecified

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SPM0103ND3-2

Amplified Mini Surface Mount Silicon Microphone

Unspecified 

SPM0103ND3

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)} Gain(dB) = 20 * log(G)

High-pass-filter Corner Frequency:

C.F. = 1 / {2*p*(R2 + R3) * C1}

Knowles Acoustics,

a division of Knowles Electronics, LLC.

Revision: C

6 of 10

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