MH88612B
TF
LPGND
VR
VREF
VEE
AGND
PD
VX
TIP
RING
RF
VCC
RC
RD
RV
VRLY
CD
VBAT
CAP
SHK
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
Data Sheet
Figure 2 - Pin Connections
Pin Description
Pin #
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
Name
TF
Description
Tip Feed.
Connects to external diode for protection
LPGND
Loop Ground.
Is the system ground reference with respect to V
BAT.
Normally connected to
AGND.
VR
VREF
VEE
AGND
PD
VX
TIP
RING
RF
VCC
RC
RD
RV
VRLY
CD
VBAT
CAP
SHK
Voice Receive (input)
is the 4 wire analog signal to the device.
Voltage Reference (Input)
Constant current feed can be adjusted by the input voltage on
V
REF
. This pin can also be grounded for normal 25mA loop current.
Negative Power Supply Voltage (-5V).
Analog Ground (0V).
Power Denial (Input).
A logic high will isolate the battery voltage to Tip/Ring.
Voice Transmit (Output)
is the 4-wire analog signal from the device.
Connects to the “Tip” lead of the telephone line.
Connects to the “Ring” lead of the telephone line.
Ring Feed (Input)
is normally connected to Ring relay for negative battery feed voltage
and ringing voltage input.
Positive Power Supply Voltage (+5V).
Relay Control (Input).
Active high.
Open collector sinks current when RC is at logic high.
Ring Feed Voltage
connects to pin 11 (RF) through a normally closed relay.
Relay voltage Supply (+5V).
Clamping Diode.
Connects to AGND
Negative Battery Feed Supply Voltage (-48V).
Connects external capacitor to ground for ring trip.
Switch Hook Detect (Output).
Active high.
2
SEMICMF.019
ZARLINK [ ZARLINK SEMICONDUCTOR INC ]
