MH89760B datasheet(13/38 Pages) MITEL

13 / 38 page

4-67

Preliminary Information

MH89760B

Figure 6 - Input/Output Configuration

Extracted

Clock

Received

Data

Transmit

Data

OUTA

+12V

OUTB

:0.5

EIT

EIR

RCLT

RCHT

RCLR

RCHR

E1.5o

RxA

RxB

RxT

RxR

VDD

TxT

TxR

TR2

Line

Receiver

0-150’

OPEN

150-450’

OPEN

450-655’

OPEN

Equalizer settings

COMPONENT VALUES:

R1 = 150

Ω 1% W

C1 = 0.01

µF 5% 250V

C2 = 0.47

µF 5% 100V

L1 = 33

µH 130mA

L2 = 33

µH 165 mA

TR1 = 1:1:0.5

Filtran* Part # TFS2573

TR2 = 1:1:1

Filtran* Part # TFS2574

*Filtran Ltd.

229 Colonnade Road

Nepean, Ontario

Canada K2E 7K3

613-226-1626

Note: The equalizer has been optimized for 22 gauge ABAM

cable. The exact distances may vary with the type of cable and the

output transformer. Different line length settings may be

required if a transformer other than the Filtran TFS2573 is used.

+5V

MH89760B

MH89761

TR1

DS1 Line Interface

Line Transmitter

The transmit line interface is made up of two open

collector drivers (OUTA and OUTB) that can be

coupled to the line with a center tapped pulse

transformer (see Figure 6). A step function is applied

to the transformer when either of the transistors is

turned on. By operating in the transient portion of the

inductance

response,

the

secondary

the

transformer produces an almost square pulse. The

capacitor and inductor on the center tap of the

transmit transformer shown in Figure 6 suppress

transients in the 12 volt supply. The series RLC

across the output of the transformer shape the pulse

to meet the AT & T or CCITT pulse templates. A

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