MH88400-1 データシートの表示（PDF） - Mitel Networks

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MH88400-1

Line Interface Circuit

Mitel Networks 

MH88400

Preliminary Information

VDD 1

AGND 2

LC 3

RVLC 4

SHK 5

VX 6

VR 7

14 TIP

13 RLS

12 PHS

11 TF

10 TXIN

9 RING

8 NC

Pin Description

Pin #

Name

1

VDD

2

AGND

3

LC

4

RVLC

5

SHK

6

VX

7

VR

8

NC

9

RING

10

TXIN

11

TF

12

PHS

13

RLS

14

TIP

Figure 2 - Pin Connections

Description

Positive Power Supply Voltage. +5V.

Analog Ground. 4-Wire Ground. Normally connected to System Ground,

Loop Control (Input). A logic low activates internal circuitry which provides a dc

termination across Tip and Ring. Used for seizing the line and dial pulsing

Ring Voltage and Current Detect (Output). A logic low indicates that loop current is

detected. The loop current can be due to the external monitor phone or the MH88400 in

the off- hook mode. The RVLC outputs pulses when the external monitor phone is dial

pulsing or when the MH88400 is dial pulses via the LC input. In addition, when the

MH88400 is in the on-hook mode, a pulsing output indicates that ringing voltage is

across the Tip and Ring leads; the pulsing outputs frequency is twice the ringing

frequency.

Switch Hook Detect (Output). This is an optional output which can be used with the

PHS input and an external phone. When loop current flows from PHS to TIP, SHK goes

to logic low.

Transmit (Output). 4-Wire ground(AGND) referenced audio output, biased at 2.5V.

Outputs for both off-hook and on-hook.

Receive (Input). 4-Wire ground (AGND) referenced audio input, biased at 2.5V. LC

must be activated low and loop current must be flowing.

No Connection. This pin is not connected internally

Ring Lead. Connects to the “Ring” lead of the central office through a relay contact. The

central office “Tip” and “Ring” leads may be interchanged

Transmit (Input). Connects to the “Ring” lead of the central office through a coupling

capacitor.

Tip Feed. Connects to the “Tip” lead of the central office through an internal resistor and

an optional external resistor.

Monitor Phone Sense (Input). This is an optional input which can be used with the

SHK output and an external phone. When loop current flows from PHS to TIP, SHK goes

to logic low.

Ring Loop Sense (Input). Sense node for ringing voltage detector and the loop current

detector.

Tip Lead. Connects to the “Tip” lead of the central office through an optional relay

contact. The central office “Tip” and “Ring” leads may be interchanged.

2-12

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