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MH88437AS-PI Datasheet(PDF) 7 Page - Mitel Networks Corporation

Part # MH88437AS-PI
Description  Data Access Arrangement Advance Information
PDF  16 Pages
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Manufacturer  MITEL [Mitel Networks Corporation]
Direct Link  http://www.mitel.com
Logo MITEL - Mitel Networks Corporation

MH88437AS-PI Datasheet(HTML) 7 Page - Mitel Networks Corporation

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Advance Information
MH88437-P
7
Figure 5 - Typical Application Circuit
TIP
NB2
RING
VX
VR+
RV
LC
AGND
TIP
RING
C2
+5V
9
8
6
16
5
3
27
28
Analog
Input
Analog
Ringing Voltage Detect Output
Loop Control Input
MH88437
+
Output
C4
C1
Notes:
R1 & C1: Dummy Ringer, country specific
ZA
7
Zext
R2: DC Mask Resistor 120k
Ω typical
R1
25
24
VR-
4
Analog
Input
R2
LCD
15
Loop Current Detect Output
NB1
ZB: Network Balance Impedance
R3
R5
R6
R4
R5 = R6: Receive Gain Resistors typically 100k
R3 & R4: Transmit Gain Resistors
≥ 2k2
C3 +
10
VBIAS
typically 0.39
µF, 250V & 3kΩ
C2 & C3 = 10
µF 6V
C7 & C8 = 39nF for 12kHz filter and 22nF for
16KHz filter. These can be left off if meter pulse
filtering not required.
Zext: External Impedance
D1 Zener Diode 6V2
L1, L2 = 4.7mH RDC<10
Ω. These can be left
off if meter pulse filtering not required.
D1
C7
L1
L2
C8
13 11
ZB
1
2
C5
C6
C4, C5 & C6 = 1
µF coupling capacitors
R7 = 620k
Ω (30V RMS ringing sensitivity)
CL
D2
D2 = Teccor P2703 Protection
R7
= Ground (Earth)
21
22
1)
2)
3)
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