CPC5620/CPC5621

6

www.clare.com

R04

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

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.

+

-

OH

RING

TX+

RX+

TX-

RX-

3.3 or 5V

C13

C14

C2

C4

R1

80.6K

10

BR-

BR-

BR-

TIP

RING

U1

LITELINK

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

32

31

30

29

28

27

26

25

24

23

22

21

20

19

18

17

VDD

TXSM

TX-

TX+

TX

GND

RX-

RX+

SNP+

SNP-

RXF

RX

MODE

OH

RING

CID

REFL

TXF

ZTX

ZNT

TXSL

BR-

NTS

GAT

NTF

DCS1

DCS2

ZDC

BR-

RPB

RXS

VDDL

DB1

BR-

BR-

A

A

A

C9

0.1μ

C16

10μ

FB1

600 Ω

200 mA

C1

1μ

60.4K

5%

200K

R13

1M

5%

C10

0.01μ

500V

R15

1.69M

R20

2

6.49M

6.49 M

0.027μ

130K

R3

1.5M

C7

4

220pF

C8

220pF

1.8M

1.8M

1.8M

1.8M

R4

68.1

BR-

NOTE: Unless otherwise noted:

Resistor values are in Ohms

All resistors are 1%.

Capacitor values are in Farads.

R14

47

Q1

CPC5602C

3

8.2

R10

301

R18

3.32K

C18

R12

499K

BR-

BR-

C15

0.01μ

500V

221K

261K

0.1μ

0.1μ

0.1μ

0.1μ

R16

R8

R5

R75

BR-

C21

100p

R76

R22

R21

C12

R6

R44

R7

R45

BR-

4

R2

CID