CPC5610/CPC5611
2. Application Circuits
LITELINK can be used with telephone networks world-
wide. Some public telephone networks, notably in
North America and Japan require resistive line temri-
nation. Other telephone networks in Europe and else-
where require reactive line termination.
The application circuits below address both line termi-
nation models. The reactive termination application
circuit (see Section 2.2 on page 8) describes a TBR-21
implementation. This circuit can be adapted easily for
other reactive termination needs. Worldwide applica-
tion of LITELINK is described more fully in Clare appli-
cation note AN-147, Worldwide Application of LITELINK.
2.1 Resistive Termination Application Circuit
Figure 3. Resistive Termination Application Circuit Schematic
3.3 or 5 V
R23²
C1
10
1
C9
FB1
600 Ω
200 mA
C16
10
0.1
A
C10
0.01
500V
C15
0.01
500V
U1
LITELINK
-BR
A
R5 (R
42.2K
1%
)
TXF
1
2
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
VDD
TXSM
TX-
REFL
TXF
R1 (R ) 80.6K 1%
TX
C13 0.1
3
-BR
R22 (R
6.8 M 1%
)
)
DCS1A
Q1
CPC5602C
ZTX
TX-
R13
(R
4
C2 0.1
TX+
TX
ZNT
TX+
)
NTS
5
1M
1%
TXSL
BR1-
NTS
R21 (R
DCS1B
C3 0.1
6
6.2 M 1%
REFM
GND
OH
7
8
R14
(R
GAT
47
OH
RING
CID
GAT
C12 (C
)
)
DCS
9
REFB
DCS1
DCS2
ZDC
RING
CID
0.027
R12 (R
) 1M 1%
NTF
10
11
12
13
14
15
16
-BR
C14 0.1
C4 0.1
RX-
RX-
R15 (R
) 1.69M 1%
) 8.2 1%
DCS2
RX+
SNP+
SNP-
RXF
RX
RX+
R16 (R
ZDC
R20
BR2-
RPB
DB1
SIZB60
600V_60A
(R
VDDL
2
)
-BR
+
RXS
VDDL
R18
TIP
R8 (R
200K 1%
)
(R
)
HTX
ZTX
150
R2
SP1¹
P3100SB
R4
(R
68.1
1%
-
(R
RXF
)
1
2
)
PB
1%
127K
1%
R9 (R
)
-BR
HNT
C18³
15 pF
A
200K 1%
-BR
-BR
R10
(R
)
ZNT
RING
301
1%
-BR
NOTE: Unless otherwise
noted, all resistors are in
Ohms, 5%. All capacitors
are in microFarads.
C7
(C
)
SNP-
220pF
2000V
R44 (R
1.8M 1/10W 1%
)
R6 (R
SNP-2
1.8M 1/10W 1%
)
SNP-1
R3
(R
1.5M
1%
)
SNPD
R45 (R
1.8M 1/10W 1%
)
C8
R7 (R )
SNP+2
) 1.8M 1/10W 1%
SNP+1
(C
220pF
2000V
SNP+
1
This design was tested and found to comply with FCC Part 68 with this
part. Other compliance requirements may require a different part.
2
Higher-noise power supplies may require substitution of a 220 µH inductor,
Toko 380HB-2215 or similar. See the Power Quality section of Clare applica-
tion note AN-146, Guidelines for Effective LITELINK Designs for more informa-
tion.
3
Optional for enhanced trans-hybrid loss, see “Trans-Hybrid Loss” on page 16.
6
www.clare.com
Rev. 9.0
CLARE [ CLARE ]
