MSA4709A View Datasheet(PDF) - Oki Electric Industry

Part Name

Description

Manufacturer

MSA4709A

Subscriber Line Interface Circuit

Oki Electric Industry 

¡ Semiconductor

MSA4709A

Notes:

*1. Use heat sinks required for Darlinton-connected power transistors.

*2. This diagram indicates that VBB or VEE (negative supply) is used for driving the

relay, but a positive supply, such as VEE indicated in Fig. 2, can also be used.

*3. This diagram indicates that the ring trip circuit consists of the RING line connected

to ground through the riging current source and the TIP line connected to the

battery (VBB), but the ring trip circuit can also be configured, using the RG pin

indicated in Fig. 2, by the RING line connected to the battery through the ringing

current source and the TIP line connected to ground.

*4. This diagram indicates VBB=–48V. If –24V is used for VBB, connect the VBS pin to

VCC and change the ring trip filtering constants from 510 kW plus 1 mF to 150 kW plus

33 mF.

*5. Use a resistor with precision of 0.1% or better.

*6. Connect additional circuits for suppressing or absorbing surge and noise caued by

relay contacts.

Battery Feed Characteristics

VBB = –48V

40

IL = 40 mA

30

IL = 30 mA

20

VBB = –24V

40

30

20

10

10

0

1

2

Loop Resistance RL (kW)

0

0.5

1

1.5

Loop Resistance RL (kW)

10/11

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