M65845AFP 查看數據表（PDF） - Renesas Electronics
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M65845AFP Datasheet PDF : 14 Pages
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M65845AFP
Function Description
Microphone Amplifier
The gain (GV) and low cut-off frequency (fcl) of microphone amplifier are expressed as follows.
GV
=
20log
•
R1
+ 1.5 k + 334
R1 + 1.5 k
k
fcl
=
2π
•
(R1
1
+ 1.5
k)
•
C1
GV (max) = 47 dB, fcl = 50 Hz
R1 = 0 Ω, C1 = 2.2 μF
Assuming GV = 37 dB, fcl = 15 Hz, for instance, the constants take the following values.
R1 = 3.3 kΩ, C1 = 2.2 μF
REF
10 kΩ (Typ)
MIC
2
1 μF
5 kΩ
+
–
334 kΩ
1.5 kΩ
3
4
R1
+
C1
<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.
MIC
2
1 μF
R2
R3 and C4 are not required for
the M65845AFP.
REF
10 kΩ (Typ)
+
–
3
4
C4
R3
R1 for the gain of microphone
R1
amplifier setting in use M65845AFP.
C1
Recommended circuit in use M65845FP
REJ03F0170-0201 Rev.2.01 Jan 25, 2008
Page 6 of 13
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