MH88437 Просмотр технического описания (PDF) - Mitel Networks

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производитель

MH88437

Data Access Arrangement

Mitel Networks 

Advance Information

MH88437-P

+5V

TIP

RING

C2 +

R2

R7

9 25 24 21 22 13 11

R4

28 TIP

VX 5 R3

R1

L2

D1

D2

MH88437

4 R5

VR-

3 R6

VR+

RV 16

LCD 15

C1

C8

LC 6

L1 27

1

NB1

RING

NB2 2 ZB

AGND VBIAS ZA

C7

8

10

7

CL

C4 Analog

Output

C5 Analog

Input

C6 Analog

Input

Ringing Voltage Detect Output

Loop Current Detect Output

Loop Control Input

C3 +

Zext

= Ground (Earth)

Notes:

1) R1 & C1: Dummy Ringer, country specific

typically 0.39µF, 250V & 3kΩ

2) R2: DC Mask Resistor 120kΩ typical

3) R3 & R4: Transmit Gain Resistors ≥ 2k2

4) R5 = R6: Receive Gain Resistors typically 100k

5) ZB: Network Balance Impedance

6) C2 & C3 = 10µF 6V

7) C7 & C8 = 39nF for 12kHz filter and 22nF for

16KHz filter. These can be left off if meter pulse

filtering not required.

8) Zext: External Impedance

9) D1 Zener Diode 6V2

10) L1, L2 = 4.7mH RDC<10Ω. These can be left

off if meter pulse filtering not required.

11) C4, C5 & C6 = 1µF coupling capacitors

12) R7 = 620kΩ (30V RMS ringing sensitivity)

13) D2 = Teccor P2703 Protection

Figure 5 - Typical Application Circuit

7

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