MH88437-P
NB1
NB2
VR+
VR-
VX
LC
ZA
AGND
VCC
VBIAS
LOOP
IC
RS
IC
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
TIP
RING
IC
VLOOP1
VLOOP2
IC
SC
SC
IC
NP
NP
CL
RV
LCD
Advance Information
Figure 2 - Pin Connections
Pin Description
Pin #
1
2
3
4
5
6
7
8
9
10
11
12,
14
13
15
16
17
18
19
2
Name
NB1
NB2
VR+
VR-
VX
LC
ZA
AGND
V
CC
VBIAS
LOOP
IC
RS
LCD
RV
CL
NP
NP
Description
Network Balance 1.
External passive components must be connected between this pin and
NB2.
Network Balance 2.
External passive components must be connected between this pin and
NB1.
Differential Receive (Input).
Analog input from modem/fax chip set.
Differential Receive (Input).
Analog input from modem/fax chip set.
Transmit (Output).
Ground referenced (AGND) output to modem/fax chip set, biased at
+2.0V.
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.
Line Impedance.
Connect impedance matching components from this pin to Ground
(AGND).
Analog Ground.
4-Wire 0V reference connect to mains earth (ground).
Positive Supply Voltage.
+5V.
Internal Reference Voltage.
+2.0V reference voltage. This pin should be decoupled
externally to AGND, typically with a 10
µF
6.3V capacitor
.
Loop (Output).
The output voltage on this pin is proportional to the line voltage across Tip -
Ring, scaled down by a factor of 50.
Internal Connection.
No connection should be made to this pin externally.
Ringing Sensitivity.
Connecting a link or resistor between this pin and LOOP (pin 11) will
vary the ringing detection sensitivity of the module.
Loop Condition Detect (Output).
Indicates the status of loop current.
Ringing Voltage Detect (Output).
The RV output indicates the presence of a ringing voltage
applied across the Tip and Ring leads.
Current Limit.
A logic 0 applied to this pin activates internal circuitry which limits the loop
current.
No Pin.
Isolation Barrier, fitted, no pin fitted in this position.
No Pin.
Isolation barrier, no pin fitted in this position
MITEL [ MITEL NETWORKS CORPORATION ]
