CPC5622 Datasheet, PDF (6/18 Pages) Clare, Inc. – LITELINK® III Phone Line Interface IC (DAA)

CPC5622
2. Application Circuits
LITELINK can be used with telephone networks
worldwide. Some public telephone networks, notably
in North America and Japan require a resistive line
termination. Other telephone networks, such as in
Europe, China and elsewhere, require a reactive line
termination.
The application circuits that follow address both types
of line termination models. A reactive termination
application circuit that describes the TBR-21
implementation is shown in Figure 2.2 on page 8. This
circuit can be easily adapted 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
RING2
RX-
RX+
FB1
600 Ω
200 mA A
R1
(R_TX)
80.6K
1 VDD
U1
C9
0.1μ
LITELINK ^{REFL 32}
2 TXSM
TXF ³¹
BR-
C13 0.1μ _{3 TX-}
ZTX ³⁰
C2 0.1μ _{4 TX+} ^CPC5622 _{ZNT 29}
5 _TX
TXSL ²⁸
6 MODE
BR- ²⁷
A
7 _GND
NTS ²⁶
8 OH
GAT ²⁵
9 _RING
NTF ²⁴
10 RING2
C14 0.1μ _{11 RX-}
C4 0.1μ _{12 RX+}
DCS1 ²³
DCS2 ²²
ZDC ²¹
13 _SNP+
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
14 _SNP-
15 _RXF
16 _RX
R2
(R_RXF)
130K
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
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.
R44
(R_SNP-1)
1.8M
R45
(R_SNP+1)
1.8M
NOTE: Unless otherwise noted:
Resistor values are in Ohms
All resistors are 1%.
Capacitor values are in Farads.
4_{Use voltage ratings based on the isolation requirements of your application.}
6
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