MH88612K Ver la hoja de datos (PDF) - Mitel Networks

Número de pieza

componentes Descripción

fabricante

MH88612K

Subscriber Line Interface Circuit

Mitel Networks 

MH88612K

Preliminary Information

and reduced by the current limit circuit to a lower

value to protect the internal circuitry.

Receive Gain

The power denial function is a feature of the

MH88612C which allows for powering down of the

subscriber loop. A logic high input applied to the

power denial pin effectively removes the battery

voltage from the loop driver circuitry. The resulting

ILoop is negligible and power consumption is

minimised. The power denial function is useful for

disabling a loop which may have a ground fault. This

pin should be held low when not in use.

Applications

Component List

R1

= 1/4 W, + 10%, 200Ω

R2

= 1/4 W, + 5%, 470Ω

C1

= Cap. elec., 1.0µF, + 10%, 25V

D1,D2,D3,D4 = Diode Rect., 200V, 1A, IN4003

K1

= Relay E/M, 5 or 6V, 1 form C

Decoupling capacitors (Cap. Cer 0.1µF, 50% + 20%) should be added to VDD, VEE, VBat, VRef and VRLY

Options RV1, RV2 = 160V Vrms, 250V, 10J

90 VRMS

R1

SUPERIMPOSED

ON -48VDC

VBat

K1

RF

D4

RV

D1

D2

TF

D3

VBat

Tip

TIP

RV1

MH88612K

VR

VX

VRef

SHK

RV2

Ring

+5V

K1

RING

RC2

RC1

VRLY

RD1

PD

CAP

VBat VDD VEE GNDA

C1

-+

Ring Trip

Filter

R2 Control

2-124

-48V +5V -5V

Figure 3 - Application Circuit

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