73M1822/73M1922 Data Sheet
DS_1x22_001
2.2 73M1912 20-Pin TSSOP Pinout
Figure 3 shows the 73M1912 20-pin TSSOP pinout.
1
20
19
18
17
16
15
14
13
12
11
DCI
DCG
2
RGN
DCS
DCD
TXM
RGP
OFH
3
4
5
6
VND/VNX
SCP
RXM
73M1912
RXP
7
MID
VPD/VPS
VNX/VNS
ACS
8
VPX
9
SRE
10
SRB
VBG
Figure 3: 73M1912 20-Pin TSSOP Pinout
Table 2 describes the pin functions for the device. Decoupling capacitors on the power supplies should be
included for each pair of supply pins.
Table 2: 73M1912 20-Pin TSSOP Pin Definitions
Pin
Pin Name
Type
Description
Number
1
DCI
I
DC loop input
2
RGN
I
I
Ring detect negative voltage input
Ring detect positive voltage input
Off-hook control
3
RGP
4
OFH
O
5
VND/VNX
SCP
GND
I/O
I/O
PWR
I
Digital/analog negative supply voltage
Positive side of the secondary pulse transformer winding
Charge pump midpoint
6
7
MID
8
VPX
Supply from the barrier, connect to VPD
Voltage regulator sense
9
SRE
10
11
12
13
14
SRB
O
Voltage regulator drive
VBG
O
VBG bypass, connect to 0.1 μF capacitor to VNS
AC current sense
ACS
I
VNX/VNS
VPD/VPS
GND
PWR
Digital/analog negative supply voltage
Digital/analog positive supply voltage
15
16
17
18
19
20
RXP
RXM
TXM
DCD
DCS
DCG
I
I
Receive plus – signal input
Receive minus – signal input
Transmit minus – signal output
DC loop drive
O
O
I
DC loop current sense
DC loop drive
O
10
Rev. 1.6
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