MH88634BV-4 데이터 시트보기 (PDF) - Mitel Networks

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MH88634BV-4

Central Office Interface Circuit

Mitel Networks 

Features

• Loop Start Trunk Interface

• 600Ω & 900Ω Input Impedance

• 2-4 Wire Conversion

• Line state Detection Outputs:

•

- Forward Loop

• - Reverse Loop

• - Ringing Voltage

• - Switch Hook

• One Relay Driver

• On-Hook Reception

• Small footprint area

• Meets FCC Part 68 Leakage Current

Requirements

Applications

Interface to Central Office for:

• PABX

• Key Telephone Systems

• Channel Bank

• Voice Mail

• Terminal Equipment

• Digital Loop Carrier

• Optical Multiplexer

RV FL RL SHK XLA XLB XLC XLD

MH88634B

Central Office Interface Circuit

Advance Information

DS5061

ISSUE 6

January 1999

Ordering Information

MH88634BV-2

MH88634BT-2

MH88634BV-4

21 Pin SIL Package

21 Pin 90° L/F Package

21 Pin SIL Package

Description

0°C to 70°C

The Mitel MH88634-2 Central Office Interface Circuit

trunk provides a complete analogue and signalling

link between audio switching equipment and a

telephone Line. The device is available in a single in

line package for high packing densities or with a lead

frame formed at 90° for low clearance applications.

The device is fabricated as a thick film hybrid

incorporating various technologies for optimum

circuit design and very high reliability.

This part supercedes the MH88634-2 and is pin for pin

compatible.

We advise that the B rev parts are fully tested.

However, we do not expect to see changes between

MH88634-2 and MH88634BV-2.

The component design has been changed to

improve the general performance of the part. It is

also now capable of operating at a 24V battery.

VCC VEE AGND

Status

Detection

TIP

RING

LRC

LRD

Dummy

Ringer

Line

Termination

2 - 4 Wire

Hybrid

Loop Relay

Driver

VRLY

Impedance

Matching

Network

Balance

Figure 1 - Functional Block Diagram

Receive

Gain

RX

Transmit

Gain

TX

2-265

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