MH88625 View Datasheet(PDF) - Mitel Networks

Part Name

Description

View to exact match

MH88625

DID/OPS Subscriber line interface circuit (SLIC) for on/off premise PBX line cards, DID line cards and central office cards.

Mitel Networks 

Preliminary Information

MH88625

Pin Description (Continued)

Pin # Name

Description

19

NATT Network Balance AT+T Node. Connects to N1 for a network balance impedance of AT&T

compromise (350Ω + 1kΩ // 210nF); the device’s input impedance must be set to 600Ω. This

node is active only when NS is at logic high. This node should be left open circuit when not

used.

20

N1 Network Balance Node 1 (Input). 0.1 times the impedance between pins N1 and N2 must

match the device’s input impedance, while 0.1 times the impedance between pins N1 and

AGND is the device’s network balance impedance. This node is active only when NS is at

logic high. This node may be terminated when not used (i.e., NS at logic low).

21

N2 Network Balance Node 2 (Output). See N1 for description.

22

Z900 Line Impedance 900Ω Node. Connects to Z1 for a line impedance of 900Ω. This node

should be left open circuit when not used.

23

Z1 Line Impedance Node 1 (Input). 0.1 times the times the impedance between pins Z1 and

Z2 is the device’s line impedance. This node must always be connected.

24

Z2 Line Impedance Node 2 (Output). 0.1 times the times the impedance between pins Z1 and

Z2 is the device’s line impedance. This node should be left open circuit when not used.

25

TX Transmit (Output). 4-Wire (AGND) referenced audio output.

26

RX Receive (Input). 4-Wire (AGND) referenced audio input.

27

GTX0 Transmit Gain Node 0. Connects to GTX1 for 0dB transmit gain.

28

GTX1 Transmit Gain Node 1. Connects to a resistor to AGND for transmit gain adjustment.

29

GRX0 Receive Gain Node 0. Connects to GRX1 for 0dB gain.

30

GRX1 Receive Gain Node 1. Connects to a resistor to AGND to receive gain adjustment.

31

IC Internal Connection. This pin is internally connected and must be left open.

32

Z600 Line Impedance 600Ω Node (Output). Connects to Z1 for a line impedance of 600Ω. This

pin should be left open circuit when not used.

33

NS Network Balance Setting (Input). The logic level at NS selects the network balance

impedance. A logic 0 enables an internal balance equivalent to the input impedance (Zin).

While a logic 1 enables an external balance 0.1 times the impedance between pins N1 and

AGND balanced to 0.1 times the impedance between pins N1 and N2. The impedance

between N1 and N2 must be equivalent to 10 times the input impedance (Zin).

34

SHK Off-Hook Indication (Output). A logic low output indicates when the subscriber equipment

has gone Off-Hook.

35

36,37,38

39

40

UD Unbalance Detect (Output). A log IC low output indicates when the DC current flow in the

Tip and Ring leads is unbalanced, indicating that the subscriber equipment has grounded

the Ring lead.

IC Internal Connection. These pins are internally connected and must be left open

VEE Negative Supply Voltage. -5V dc.

VDD Positive Supply Voltage. +5V dc.

2-185

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