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

MB86434
(Continued)
Pin No. Symbol I/O A/D
Description
43 BBI
O A AMP3 output pin. Should be included in HPF together with IM3, to prevent
DC offset from entering speakers.
44 IM3
I A AMP3 inverted (–) signal input pin.
45 BTO
O A Receiving volume adjustment circuit output pin.
46 OP2
O A AMP2 output pin. If AMP2 is not used, IM2 should be shorted to OP2.
47 IM2
I A AMP2 inverted (–) signal input pin. Can form a circuit with OP2 to add
sidetone or tone. Melody circuits, if used, can also be connected here.
48 OP1
O A AMP1 output pin. Can form a circuit with IM1 to include LPF or HPF in
receiving block. If AMP1 is not used, IM1 should be shorted to OP1.
49 IM1
I A AMP1 inverted (–) signal input pin.
50 PTBO
O A PCM receiver output pin.
51 BAG
G A Analog ground pin for sending, receiving blocks. To be set to 0 V.
52 VDDAB
P A Analog power supply pin for sending, receiving blocks. To be set within
range 4.75 to 5.25 V.
53 XJMIC
I A Microphone amp (2) non-inverted (+) signal input pin.
54 JMIC
I A Microphone amp (2) inverted (–) signal input pin.
55 JMICO
I A Microphone amp (2) output pin.
56 XMIC
I A Microphone amp (1) non-inverted (+) signal input pin.
57 MIC
I A Microphone amp (1) inverted (–) signal input pin.
58 MICO
O A Microphone amp (1) output pin.
59 SGO
O A Sending block signal ground potential output pin. Buffers SGC voltage.
60 BBO
O A Sending analog signal output pin.
61 N.C.
— — Not connected. To be left open.
62 N.C.
— — Not connected. To be left open.
63 BTPI
I A PCM ENCODE block input OP amp negative input pin.
64 BTPO
O A PCM ENCODE block input OP amp output pin.
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