MH88435AS-PI datasheet(7/16 Pages) MITEL

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Preliminary Information

MH88435-P

2-45

Figure 5 - Typical Application Circuit

TIP

NB2

RING

VR+

AGND

TIP

RING

+5V

Analog

Input

Analog

Ringing Voltage Detect Output

Loop Control Input

MH88435

Output

Notes:

1) R1 & C1: Dummy Ringer, country speciﬁc

Zext

2) R2: DC Mask Resistor typical 360k

Ω

VR-

Analog

Input

LCD

Loop Current Detect Output

NB1

5) ZB: Network Balance Impedance

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

3) R3 & R4: Transmit Gain Resistors

≥ 2k2

C6 +

VBIAS

typically 0.39

µF, 250V & 3kΩ

6) C2, C6 = 10

µF 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 = 4m7H 80mA. These can be left off if

meter pulse ﬁltering not required.

13 11

11) C3, C4 & C5 = 1

µF coupling capacitors

12) R7 = 620k

Ω (30V RMS ringing sensitivity)

13) D2 = Teccor P3100SB

= Ground (Earth)

22 21

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