M65845AFP

REJ03F0170-0201 Rev.2.01 Jan 25, 2008

Page 6 of 13

Function Description

Microphone Amplifier

R1 + 1.5 k + 334 k

R1 + 1.5 k

1

2

π • (R1 + 1.5 k) • C1

fcl =

R1 = 0

Ω, C1 = 2.2 μF

R1 = 3.3 k

Ω, C1 = 2.2 μF

MIC

+

–

5 k

Ω

10 k

Ω (Typ)

R1

C1

1.5 k

Ω

334 k

Ω

1

μF

2

3

4

REF

+

<Attention point when M65845FP is replaced with M65845AFP>

R3 and C4 are required for the M65845FP, not for the M65845AFP. As mentioned above, the gain of microphone

amplifier can set it up with R1.

Recommended circuit in use M65845FP

R3 and C4 are not required for

the M65845AFP.

R1 for the gain of microphone

amplifier setting in use M65845AFP.

MIC

+

–

R2

10 k

Ω (Typ)

R1

C1

R3

1

μF

C4

2

3

4

REF