MB86434 Datasheet, PDF (23/38 Pages) Fujitsu Component Limited. – 5V Single Power Supply Audio Interface Unit (AIU)

MB86434
• Tone and Sidetone Addition by Inclusion of Third-Order HPF
SGC
R 10 C 7
C8
IM1
R11
–
+
AMP1 OP1
SGC
C9
R 12 R 13 C 10
SGC
IM2
OP2
–
+
AMP2
R 14 R 15 C 11
PTBO
(receiving)
TONEO (tone)
BBO (sidetone)
EV2
BTO
SGC
IM3
BBI
–
+
AMP3
(Inside IC)
C 16
R 16
R 17
C 17
IMTON
Secondary HPF
A = –C 8/C 9
ω/Q = 1/ (R 10 C 9 C 7)* (C 7+C 8+C 9
ω 2 = 1/ (R 10 R 11 C 9 C 7)
Signal addition
R 12 = R 13 = R 14 = R 15 = 100 kΩ
C 10 = C 11 = 0.1 µF
Primary HPF
A = –R 17/R 16
f c = 1/(2πC 16 R 16)
C 17 = 0.1 µF
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