Datasheet
73M2901CE Data Sheet DS_2901CE_031
22 Rev. 3.4
L3
NLV32T-4R7J-PF
L4
NLV32T-4R7J-PF
C29
220pF, 3kV
R20
20K
C26
82nF
VCC3_3A
Q1
MMBTA06
B
E C
R17
100
-EMIT4033 is required for Austalia only;
the non-encapsulated MIT4033 can be
used for designs not requiring Austalian
operation.
VCC3_3D
Q2
MMBTA06
B
E C
Q3
BCP-56
1
2
3
4
U2A 74LVC4066D
1
2
13
AUST
U2B 74LVC4066D
11
10
12
-This version supports only:
---Ring-E
---PPU-E
---LIU-E
D1
RS1G
CTR-21
US600
CTR-21
AUST
US600
U2C 74LVC4066D
SOIC14
4
3
5
-To use the programmable termination:
For all: S102-3, S104-1, S95-128, S110-64
600 Ohm termination: S101+1, S101-2, S103-1
CTR-21 termination: S101-1, S101+2, S103-1
Australian termination: S101-1, S101-2,
S103+1
VCC3_3
-All resistors 0603 footprint except R25 which is
1206
D2
MMSZ5248BT
2 1
VCC3_3
-Keep Vref and Vbg traces away from digital
traces, especially clocks. Keep traces short and
connect Vref and Vbg caps to analog ground.
-Keep analog and digital power and
ground separate up to J1 connector.
Note: A termination MUST be programmed
or no termination will be activated.
18V
C27
.047uF
D3
MMSZ52C2V4S
2
1
C18
0.22uF
250V
R28
47K
C19
0.22uF
250V
RING/CID detection
R8
30K
R9
30K
HOOK
RING/CIDdetection
C20 150nF
TXA N
R27 420
R26 820
C25 115nF
F1
MF-R015/600
Bourns
PTC fuse
E1
TISP4350T3BJR
Bourns
Thyristor
R15
5.1K
R25
18
1/2W
+
C21
3.3uF, 25V
R12
62K
R23
33K
+
C22
3.3uF, 16V
L2
NLV32T-4R7J-PF
L1
NLV32T-4R7J-PF
U4
TLP627
12
4
3
-+
BR1
HD04
4
1
3
2
J2
RJ-11
1
2
3
4
VCC3_3D
R XA
VBG
C3
33pF
C11
0.1uF
VCC3_3A
DTRB
J1
1
2
3
4
5
6
7
8
9
10
DCDB
C4
0.002uF(NC)
C7
0.1uF
OSCIN
R2
2K(NC)
+
C12
3.3uF
RESET
C8
0.1uF
C24
3.3uF
C14
0.1uF
DSRB
DCDB
RXDB
R13
21K
Y1
11.0592 MHz
TXA P
C10
0.1uF
TXD B
R16
100
OSCOUT
VCC3_3D
VCC3_3
RIB
+
C1
10uF
C2
27pF
CTSB
U1A 2901CE_QFN/TQFP32
USR20
29
RING
30
RELAY
31
RI
32
DTR
28
RXCLK
27
R XD
26
VND
1
VPD
2
DCD
3
DSR
4
CTS
5
RTS
6
USR11
7
USR10
8
RESET
9
VPA
10
TXA N
11
TXA P
12
VREF
13
VBG
14
R XA
15
VNA
16
VND
17
OSCOUT
18
OSCIN
19
VPD
20
N/C
21
TXD
23
TXCLK
24
VPD
25
VND
22
+
C5
3.3uF
+
C13
3.3uF
C6
0.1uF
R1
10K
+
C9
10uF
RTSB
VREF
RELAY B
VCC3_3D
R24 750
VCC3_3D
T1
EMIT4033
Sumida
1
4
2
3
C28
220pF, 3kV
7.2 Reference Design Using Traditional Hardware Line Monitoring
Figure 4: 73M2901CE Worldwide Demo Board: Daughter Board Schematic