MSA4709A データシートの表示（PDF） - Oki Electric Industry
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MSA4709A Datasheet PDF : 11 Pages
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¡ Semiconductor
MSA4709A
PIN DESCRIPTION
Pin No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Name
VBB
A
NE
NB
RSO
CN
RY
CDC
RSI
RB
RG
VEE
4WR
BN
ZR
SCN
Description
Battery supply, –48 V or –24 V input.
The Ring voltage sensing input. This input is high impedance (apr. 37 kW), and is
connected to the built-in over voltage protection circuit.
The Ring current sensing input is connected to the emitter of NPN Darlington transistor
and the power resistor REA.
The base drive output for the NPN Darlington transistor.
Relay driver current sink terminal.
Battery noise rejection capacitor input. This capacitor value is 1 mF (60V).
AC performance adjusting resistor RY input.
AC high impedance providing capacitor Cdc input and constant current feed at the short
line adjusting zener diode input. This capacitor value is 1 mF (15V).
Relay driver current source terminal.
Ring-Trip filtering capacitor input (RING).
Ring-Trip filtering capacitor input (TIP).
–5 V input.
Receive input and is connected to the negative input of the built-in buffer operational
amplifier.
Balancing network drive output.
Receive gain adjust and frequency compensation input.
Output of both the fault current detector and loop current detector. This output is open-
collector with a built-in pull-up resistor. (apr. 10 kW).
Condition
• ON-Hook
• OFF-Hook
• Dial pulse: break
• Dial pulse: make
• RING TRIP
• Ground/Battery fault
SEL = "H"
H
L
H
L
L
L
SEL = "L"
H
H
H
H
H
L
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