CPC5620/CPC5621

6

www.clare.com

Rev. 0.E

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-

tions of LITELINK are described more fully in Clare

application note AN-147, Worldwide Application of

LITELINK.

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 part.

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 appli-

cation note AN-146, Guidelines for Effective LITELINK Designs for more

information.

³Optional for enhanced trans-hybrid loss.

1

2

+

-

OH

RING

CID

TX+

RX+

TX-

RX-

3.3 or 5 V

C13 0.1

C14 0.1

C2 0.1

C4 0.1

R1 (R

) 80.6K 1%

TX

R23²

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

SP1¹

BR-

BR-

A

A

A

C9

0.1

C16

10

FB1

600

200 mA

Ω

C1

1

R5 (R

)

60.4K

1%

TXF

R76 (R

)

200K 1%

HNTF

R13

(R

)

1M

1%

NTS

C10

0.01

500V

R15 (R

)

1.69M 1%

DCS2

R20

(R

)

2

VDDL

R21 (R

)

1%

DCS1B

6.2 M

R22 (R

)

6.8 M 1%

DCS1A

C12 (C

)

0.027

DCS

R2

(R

)

130K

1%

RXF

R3

(R

)

1.5M

1%

SNPD

C7

(C

)

220pF

2000V

SNP-

C8

(C

)

220pF

2000V

SNP+

R6 (R

)

1.8M 1/10W 1%

SNP-2

R44 (R

)

1.8M 1/10W 1%

SNP-1

R7 (R

)

1.8M 1/10W 1%

SNP+2

R45 (R

)

1.8M 1/10W 1%

SNP+1

R4

(R

)

68.1

1%

PB

BR-

NOTE: Unless otherwise

noted, all resistors are in

Ohms, 5%. All capacitors

are in microFarads.

R14

(R

)

47

GAT

Q1

CPC5602C

C21 (C

) 100 pF

GAT

R10

(R

)

301

1%

ZNT

R18

(R

)

3.32K

1%

ZTX

R12 (R

) 499K 1%

NTF

R16 (R

) 8.2 1%

ZDC

BR-

BR-

C15

0.01

500V

C18

15 pF³

R8 (R

)

221K 1%

HTX

R75 (R

)

261K 1%

NTX