MH88612C
IC
TF
IC
VR
VRef
VEE
GNDA
GS
VX
TIP
RING
RF
VDD
RC
RD
RV
VRLY
IC
VBat
CAP
SH K
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
Preliminary Information
Figure 2 - Pin Connections
Pin Description
Pin #
0
1
2
3
4
Name
IC
TF
IC
VR
VRef
Description
Internal Connection.
No pin fitted in this position.
Tip Feed.
Connects to external diode to LPGND for protection.
Internal Connection.
No pin fitted in this position.
Voice Receive
(input) is the 4 wire analog signal to the SLIC.
Voltage Reference
to set the constant current feed to the subscriber line. Constant current
feed can be adjusted by the input voltage on the VRef. This pin can also be grounded for
normal 21mA loop current.
Negative Power Supply voltage.
(-5V).
Analog Ground.
(0V)
Gain setting (Input).
A logic low at this input adds an additional -0.5dB gain in the receive
direction. This gain is in addition to the gain set by the Codec. A high adds 0dB gain.
Voice Transmit
(Output) is the 4-wire analog signal from the SLIC.
Connects to the “Tip” lead of the telephone line.
Connects to the “Ring” lead of the telephone line.
Ring Feed (Input).
is connected via the ring relay to either negative battery feed voltage,
(RV), or ringing voltage input.
Positive Power Supply Voltage.
(+5V)
Relay Control (Input).
Active high will apply ringing to the line.
Output Drive Sources current when RC is at a logic high.
Ring Feed Voltage
connects to pin 11 (RF) through a normally closed relay contact.
Relay voltage Supply.
(+5V)
Internal Connection.
No pin fitted in this position.
Negative Battery Feed Supply Voltage.
(-48V)
Connects external capacitor to ground for ring trip.
Switch Hook Detect (Output).
Active high.
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
VEE
GNDA
GS
VX
TIP
RING
RF
VDD
RC
RD
RV
VRLY
IC
VBat
CAP
SHK
2-114
MITEL [ MITEL NETWORKS CORPORATION ]
