MTH88437AD-P 데이터 시트보기 (PDF) - Mitel Networks

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MTH88437AD-P

Data Access Arrangement

Mitel Networks 

MH88437-P

Advance Information

NB1 1

NB2 2

VR+ 3

VR- 4

VX 5

LC 6

ZA 7

AGND 8

VCC 9

VBIAS 10

LOOP 11

IC 12

RS 13

IC 14

28 TIP

27 RING

26 IC

25 VLOOP1

24 VLOOP2

23 IC

22 SC

21 SC

20 IC

19 NP

18 NP

17 CL

16 RV

15 LCD

Figure 2 - Pin Connections

Pin Description

Pin # Name

Description

1

NB1 Network Balance 1. External passive components must be connected between this pin and

NB2.

2

NB2 Network Balance 2. External passive components must be connected between this pin and

NB1.

3

VR+ Differential Receive (Input). Analog input from modem/fax chip set.

4

VR- Differential Receive (Input). Analog input from modem/fax chip set.

5

VX Transmit (Output). Ground referenced (AGND) output to modem/fax chip set, biased at

+2.0V.

6

LC Loop Control (Input). A logic 1 applied to this pin activates internal circuitry which provides

a DC termination across Tip and Ring. This pin is also used for dial pulse application.

7

ZA Line Impedance. Connect impedance matching components from this pin to Ground

(AGND).

8

AGND Analog Ground. 4-Wire 0V reference connect to mains earth (ground).

9

VCC Positive Supply Voltage. +5V.

10 VBIAS Internal Reference Voltage. +2.0V reference voltage. This pin should be decoupled

externally to AGND, typically with a 10µF 6.3V capacitor.

11 LOOP Loop (Output). The output voltage on this pin is proportional to the line voltage across Tip -

Ring, scaled down by a factor of 50.

12,

IC Internal Connection. No connection should be made to this pin externally.

14

13

RS Ringing Sensitivity. Connecting a link or resistor between this pin and LOOP (pin 11) will

vary the ringing detection sensitivity of the module.

15

LCD Loop Condition Detect (Output). Indicates the status of loop current.

16

RV Ringing Voltage Detect (Output). The RV output indicates the presence of a ringing voltage

applied across the Tip and Ring leads.

17

CL Current Limit. A logic 0 applied to this pin activates internal circuitry which limits the loop

current.

18

NP No Pin. Isolation Barrier, fitted, no pin fitted in this position.

19

NP No Pin. Isolation barrier, no pin fitted in this position

2

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