HC55120, HC55121, HC55130, HC55140, HC55142, HC55143, HC55150

FN4659 Rev 13.00

Page 32 of 36

June 1, 2006

Basic Application Circuit - Pulse Metering 28 Lead PLCC Package

FIGURE 28. UniSLIC14 PULSE METERING BASIC APPLICATION CIRCUIT

VRX

ZT

RSYNC_REV

ILIM

RD

SHD

GKD_LVM

C1

C2

C3

RRLY

CH

VBH

VBL

RDC_RAC

CDC

DR

DT

CRT_REV_LVM

+5V

RELAY

RING

TIP

RING

CONTROL LOGIC

CODEC/FILTER

U1

2

3

8

9

11

12

13

14

20

1

4

15

16

17

18

19

21

22

23

24

26

28

PTG

AGND

SPM

12/16kHz

PULSE METERING

INPUT SIGNAL

GENERATOR

10

C7

+5V

-24V

-48V

25

27

TIP

RING

BGND

U2

5

6

7

+5V OR

+12V

OPTIONAL

WHEN USING A NON-DSP CODEC.

NON-DSP CODEC’s.

NOT REQUIRED FOR DSP CODEC.

REQUIRED FOR DSP CODEC’s

+-

TABLE 3. BASIC APPLICATION CIRCUIT COMPONENT LIST

COMPONENT

VALUE

TOLERANCE

RATING

U1 - SLIC

UniSLIC14 Family

N/A

N/A

U2 - Dual Asymmetrical Transient Voltage Suppressor

TISP1072F3

N/AN/A

RP (Line Feed Resistors)

30



Matched 1%

2.0W

R1 (RDC_RAC Resistor)

26.1k



1%

1/16W

R2, R3

2M



1%

1/16W

R4 (RD Resistor)

41.2k



1%

1/16W

R5 (ROH Resistor)

38.3k



1%

1/16W

R6 (RILIM Resistor)

33.2k



1%

1/16W

R7 (RSYNC_REV Resistor)

34.8k



1%

1/16W

R8 (RZT Resistor)

107k



1%

1/16W

R9, R10, R11

20k



1%

1/16W

R12

400



5%

2W

C1 (Supply Decoupling), C2

0.1

F

20%

10V

C5 (Supply Decoupling)

0.1

F

20%

50V

C6 (Supply Decoupling)

0.1

F

20%

100V

C4, C7, C10, C11

0.47

F

20%

10V

C3

4.7

F

20%

50V

C8, C9

2200pF

20%

100V

D1, Recommended if the VBL supply is not derived from the VBH Supply

1N4004

-

-

Design Parameters

protection resistors, impedance across Tip and Ring terminals = 600

. Where applicable, these component values apply to the Basic Application

Circuits for the HC55120, HC55121, HC55130/1, HC55140/1, HC55142/3 and HC55150/1. Pins not shown in the Basic Application Circuit are

no connect (NC) pins.