MH88628 View Datasheet(PDF) - Mitel Networks

Part Name

Description

Manufacturer

MH88628

Central Office SLIC

Mitel Networks 

MH88628

®

Central Office SLIC

Preliminary Information

Features

• Programmable gain, network balance and

impedance

• Transformerless 2-4 wire conversion

• Constant current with constant voltage fallback

for long loop capability

• Pin compatible with MH88632, MH88620 and

MH88628

• Unbalanced detection (Tip, Ring ground

sensing)

• Auto ring trip with zero crossing

• On-Hook transmission (ANI) capability

• Compatible with requirements of CCITT,

DOC/FCC and CSA/UL

• Excellent power dissipation (SIL vertical

mounting)

• 12/16kHz meter pulse injection control

• Solid State TIP/RING reversals

• Ringing amplifier

ISSUE 5

April 1995

Ordering Information

MH88628

40 Pin SIL Package

0°C to 70°C

Applications

• On/Off Premise PBX Line Cards

• DID (Direct Inward Dial) Line Cards

• Central Office Line Cards

Description

The Mitel MH88628 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 MH88628 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 C.O. line card can

be implemented with very few external components.

RING

RF1

RF2

TIP

TF1

TF2

UD

VRLY

RNGD

RD

VBat LGND

LCA

VDD VEE

AGND

Matched

Feed

Resistors

Unbalanced

Detection

Driver

Circuitry

and

Speech

Circuit

Decoder

Circuit

Ringing

Amplifier

External

Signal

Input

Loop

Current

Set

Switch-hook

Threshold Set

Switch-hook

Detect

Ring

Filter

Impedance

Network

2-4 Wire

Conversion

Gain Adjust

SHK

NS

N1

N2

NATT

SEL1 SEL2 ACRI DCRI ESI ESE Z900 Z600 Z1 Z2 GRX1 GRX0 RX GTX1 GTX0 TX

Figure 1 - Functional Block Diagram

2-199

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