CM1481 Datasheet, PDF(7/24 Page) ON Semiconductor – 2-Channel EMI Filter with ESD Protection for Headsets/Speakers

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CM1481 Datasheet, PDF (7/24 Pages) ON Semiconductor – 2-Channel EMI Filter with ESD Protection for Headsets/Speakers

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CM1481 PCB Layout

J1/1

J1/13

Note the position of the

on-board LINK on the

underside of the printed

circuit board.

If Alert Levels are to be

fed to an external audio

amplifier it is

recommended that the

LINK is removed so

that the ALERT output

can drive a high

impedance stage.

LINK IN will drive an

external loudspeaker.

LINK OUT will drive an

external amplifier

OUT -AUDIO SWITCH

CM1481 Top View

Fig.4 PCB Layout

CM1481 Underside View

Component Value

U1 68HC705C8

FX803LS

93CO6

LM2931-5

BCX19

BSR41

4.7Mâ¦

100kâ¦

not used

10.0kâ¦

Table 2 Components List

Component Value

10.0kâ¦

330â¦

47.0kâ¦

R10

47.0kâ¦

R11

47.0kâ¦

R12

2.2Mâ¦

R13

not used

R14

100kâ¦

R15

100kâ¦

R16

47.0kâ¦

R17

10.0kâ¦

R18

470kâ¦

R19

470kâ¦

Component Value

R20

47.0kâ¦

R21

47.0kâ¦

R22

470kâ¦

R23

10.0kâ¦

R24

10.0kâ¦

R25

10.0kâ¦

R26

22.0â¦

R27

2.0kâ¦

R28

LINK

R29

100kâ¦

R30

Note 1

R31

Note 1

39.0pF

22.0pF

Component Value

0.1ÂµF

not used

0.1ÂµF

not used

22.0pF

not used

C10

22.0ÂµF

C11

0.1ÂµF

C12

0.1ÂµF

C13

0.1ÂµF

C14

0.1ÂµF

C15

0.1ÂµF

4.0MHz

Notes

1. Pads are made available on the CM1481 PCB for resistors R30 and R31 (not installed on this version) for future

hardware upgrades.

2. The pads to the audio switch are available for use with system audio. This switch operates in conjunction with the

Quiet/Open function. Refer to Radio Interface pin functions.

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