MH88612K
TF
RF
IC
IC
IC
IC
IC
TIP
IC
RING
RC2
LPGND
IC
VR
VRef
CAP
SHK
GNDA
VEE
VDD
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
TF
VBat
RV
PD
VX
IC
IC
VRLY
RC1
RD1
Preliminary Information
21
22
23
24
25
26
27
28
29
30
Figure 2 - Pin Connections
Pin Description
Pin #
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Name
TF
RF
IC/NC
IC/NC
IC/NC
IC/NC
IC/NC
TIP
IC/NC
RING
RC2
LPGND
IC/NC
VR
VRef
Description
Tip Feed.
Connects to external diode for protection. Internally connected to pin 21.
Ring Feed (Input).
is normally connected to ring relay for negative battery feed voltage
and ringing voltage input.
No Connections to be made to this pin, used for internal connection.
No Connections to be made to this pin, used for internal connection.
No Connections to be made to this pin, used for internal connection.
No Connections to be made to this pin, used for internal connection.
No Connections to be made to this pin, used for internal connection.
Connects to the “Tip” lead of the telephone line.
No Connections to be made to this pin, used for internal connection.
Connects to the “Ring” lead of the telephone line.
Relay Control 2 (Input).
Active high to reverse Tip/Ring.
Loop Ground
is the system ground reference with respect to V
Bat
. Normally tied with
GNDA.
No Connections to be made to this pin, used for internal connection.
Voice Receive (Input)
is the 4-wire analog signal to the SLIC.
Voltage Reference (Input).
to set the constant current feed to the subscriber line.
Constant current feed can be adjusted by the input voltage on the V
Ref
. This pin can also be
grounded for normal 25mA loop current.
Connects external capacitor to ground for ring trip.
Switch Hook Detect (Output).
Active high
Analog Ground (0V)
Negative Power Supply Voltage (-5V).
Positive Power Supply Voltage (+5V).
Tip Feed.
Connect an external diode for protection. Internally connected to pin 1.
Negative Battery Feed Supply Voltage
(-48V).
16
17
18
19
20
21
22
CAP
SHK
GNDA
VEE
VDD
TF
VBat
2-122
MITEL [ MITEL NETWORKS CORPORATION ]
