MH88620BR 데이터 시트보기 (PDF) - Mitel Networks

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MH88620BR

C.O. SLIC

Mitel Networks 

MH88620BR

®

C.O. SLIC

Preliminary Information

Features

• 900 ohm input impedance

• Externally selectable network balances

• Transformerless 2-4 wire conversion

• Programmable constant resistance feed

• Off-Hook and Dial pulse detection

• High immunity to externally induced longitudinal

currents

• Auto ring trip

• On-hook transmission (ANI) capability

• Minimum protection circuitry required

• Compatible with requirements of TELEBRAS

DOC/FCC, CSA/UL, CCITT

• Excellent power dissipation (SIL vertical

mounting)

Applications

• On/Off-Premise PBX Line Cards

• Central Office Line Cards

ISSUE 3

April 1995

Ordering Information

MH88620BR 40 Pin SIL Package

0°C to 70°C

Description

The Mitel MH88620BR SLIC provides all of the

functions required to interface 2-wire off premise

subscriber loops to a serial TDM, PCM, switching

network of a modern PBX. The MH88620BR is

manufactured using thick film hybrid technology

which offers high voltage capability, reliability and

high density resulting in significant printed circuit

board area savings. A complete line card can be

implemented with very few external components.

RING

RF1

RF2

TIP

TF1

TF2

VBat LGND

Matched

Feed

Resistors

Driver

Circuitry

and

Speech

Circuit

Auto Ring

Trip

LCA

VDD VEE AGND

Loop

Current

Set

Switch-Hook

Threshold Set

Switch-Hook

Detect

Ring

Filter

Impedance

Network

2W/4W

conversion

SHK

N1

N2

TRD

Test Relay

Driver

Ring Relay

Driver

Gain Adjust

TRC RGND VRLY RNGC RRD

Z1 Z2 GRX1 GRX0 RX GTX1 GTX0 TX

Figure 1 - Functional Block Diagram

2-145

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