CPC5620_1 Datasheet, PDF (6/17 Pages) Clare, Inc. – LITELINK® III Phone Line Interface IC (DAA)

CPC5620/CPC5621
2. Application Circuits
LITELINK can be used with telephone networks
worldwide. Some public telephone networks, notably
in North America and Japan require resistive line
termination. Other telephone networks, as in Europe
and elsewhere, require a reactive line termination.
The application circuits below address both line
termination models. The reactive termination
application circuit (see Figure 4 on page 8) describes the
TBR-21 implementation. This circuit can be adapted
easily for other reactive termination needs.
2.1 Resistive Termination Application Circuit
Figure 3. Resistive Termination Application Circuit Schematic
3.3 or 5V
R23 ²
10
C1
1μ
C16
10μ
A
TX-
TX+
OH
RING
CID
RX-
RX+
FB1
600 Ω
200 mA A
R1
(R_TX)
80.6K
1 VDD
2 TXSM
C13 0.1μ _{3 TX-}
C2 0.1μ _{4 TX+}
U1
LITELINK
5 _TX
6 MODE
A
7 _GND
8 OH
9 _RING
10 CID
C14 0.1μ _{11 RX-}
C4 0.1μ _{12 RX+}
13 _SNP+
14 _SNP-
15 _RXF
16 _RX
R2
(R_RXF)
130K
C9
0.1μ
REFL 32
TXF ³¹
BR-
ZTX ³⁰
ZNT ²⁹
TXSL ²⁸
BR- ²⁷
NTS ²⁶
GAT ²⁵
NTF ²⁴
DCS1 ²³
DCS2 ²²
ZDC ²¹
BR- ²⁰
R5
(R_TXF)
60.4K
BR-
R75
(R_NTX)
261K
C10
0.01μ
500V
R13
(R_NTS)
1M
R22
(R_DCS1A)
6.49 M
R12
(R_NTF)
499K
R15
(R_DCS2)
1.69M
C21
100p
BR- (C_GAT)
R21
(R_DCS1B)
6.49M
C12
(C_DCS)
0.027μ
BR-
R16
8.2
(R_ZDC)
3
RPB ¹⁹
18
RXS
2R0706K(R^HT_R^F)8
221K
BR-
(R_HTX)
VDDL ¹⁷
C18
15p ³
R4
(R_PB)
68.1
R10
(R_ZNT)
301
BR-
BR-
R18
(R_ZTX)
3.32K
BR-
R14
(R_GAT)
47
5%
Q1
CPC5602C
R20
(2R_VDDL)
5%
C15
0.01μ
500V
BR-
+ _DB1
-
BR-
TIP
SP1 ¹
RING
C7
(C_SNP-) ⁴
220pF
R3
(R_SNPD)
1.5M
C8
(C_SNP+)
4
220pF
R6
(R_SNP-2)
1.8M
R7
(R_SNP+2)
1.8M
R44
(R_SNP-1)
1.8M
R45
(R_SNP+1)
1.8M
¹This design was tested and found to comply with FCC Part 68 with this
Sidactor. Other compliance requirements may require a different part.
²Higher-noise power supplies may require substitution of a 220 μH inductor,
Toko 380HB-2215 or similar. See the Power Quality section of Clare
application note AN-146, Guidelines for Effective LITELINK Designs for
more information.
³Optional for enhanced transhybrid loss.
4_{Use voltage ratings based on the isolation requirements of your application.}
NOTE: Unless otherwise noted:
Resistor values are in Ohms
All resistors are 1%.
Capacitor values are in Farads.
6
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R04