MT91610 Просмотр технического описания (PDF) - Mitel Networks

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MT91610

Analog Ringing SLIC

Mitel Networks 

Preliminary Information

MT91610

Pin Description (continued)

Pin # Name

Description

20

Z1

Line Impedance Node 1. A resistor of scaled value "k" is connected between Z1 and Z2.

This connection can not be left open circuit.

21

CP5

Line Impedance AC couple. A 0.1uF cap must be connected between this pin and Z1

(pin 16)

22

Z2

Line Impedance Node 2. This is the common connection node between Z1 and Z3.

23

Z3

Line Impedance Node 3. A network either resistive or complex of scaled value "k" is

connected between Z3 and Z2. This connection can not be left open circuit.

24

GTX0 Gain Node 0. This is the common node between Z3 and VX where resistors are

connected to set the 2W to 4W gain.

25

VX

Transmit Audio. 4W analog signal from the SLIC.

26

ESI

External Signal Input. 12 / 16 KHz signal input

27

GTX1 Gain Node 1. The common node between VR and the audio input from the CODEC or

switching network where resistors are fitted to sets the 4W to 2W gain

28

VR

Receive Audio. 4W analog signal to the SLIC.

29

CP6

Ringing Cap. A 0.47uF cap should be connected between this pin and GND for ringing

voltage filtering.

30

RC

Ringing Control. An active high (+5V) on this pin will set up the DC feed and gain of the

SLIC to apply 20 Hz ringing. When low (0V) set the SLIC in normal constant current mode

of operation.

31

UD

UnBalance Detect. To indicate an offset current between Tip and Ring

32

VBAT VBAT. The negative battery supply, typically at -48V

33

SHK

Switch Hook. This pin indicates the line state of the subscribers telephone. The output

can also be used for dial pulse monitoring. This pin is active high

34

CP7

Deglitching Cap. A 33nF should be connected between this pin and GND

35

RV

Ringing Voltage. 20 Hz sinusoidal or square wave AC in for balance ringing

36

VEE

Negative supply rail, -5V.

Functional Description

Refer to Figure 4 for MT91610 components

designation.

4 wire signal, which is the output from the SLIC to

the analog switch or voice CODEC.

Gain Control

The MT91610, with external bipolar transistors,

functions as an Analog Line SLIC for use in a 4 Wire

switched system. The SLIC performs all of the

BORSH functions whilst interfacing to a CODEC or

switching system.

2 Wire to 4 Wire conversion

The SLIC performs 2 wire to 4 wire conversion by

taking the 4 wire signal from an analog switch or

voice CODEC, and converting it to a 2 wire

differential signal at Tip and Ring. The 2 wire signal

applied to tip and ring by the phone is converted to a

It is possible to set the Transmit and Receive gains

by the selection of the appropriate external

components.

The gains can be calculated by the following

formulae:

2W to 4W gain

Gain 2 - 4 = 20 Log [ R8 / R7]

4W to 2W gain

Gain 4 - 2 = 20 Log [0.891 * [R10 / R9)]

3

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