MC13109A datasheet(21/28 Pages) MOTOROLA

Part #	MC13109A

Description	UNIVERSAL CORDLESS TELEPHONE SUBSYSTEM IC

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Manufacturer	MOTOROLA [Motorola, Inc]

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MC13109A

21

MOTOROLA RF/IF DEVICE DATA

Carrier Detect Threshold Programming

The “CD Out” pin will give an indication to the

microprocessor if a carrier signal is present on the selected

channel. The nominal value and tolerance of the carrier

detect threshold is given in the carrier detect specification

section of this document. If a different carrier detect threshold

value is desired, it can be set through the MPU interface as

shown in Figure 23 below.

Figure 23. Carrier Detect Threshold Control

CD

Bit #4

CD

Bit #3

CD

Bit #2

CD

Bit #1

CD

Bit #0

CD

Control #

Carrier Detect

Threshold

0

– 20 dB

0

1

–19 dB

0

1

0

2

–18 dB

0

1

3

–17 dB

0

1

0

4

–16 dB

0

1

0

1

5

–15 dB

0

1

0

6

–14 dB

0

1

7

–13 dB

0

1

0

8

–12 dB

0

1

0

1

9

–11 dB

0

1

0

1

0

10

–10 dB

0

1

0

1

11

– 9.0 dB

0

1

0

12

– 8.0 dB

0

1

0

1

13

–7.0 dB

0

1

0

14

– 6.0 dB

0

1

15

– 5.0 dB

1

0

16

– 4.0 dB

1

0

1

17

– 3.0 dB

1

0

1

0

18

– 2.0 dB

1

0

1

19

–1.0 dB

1

0

1

0

20

0 dB

1

0

1

0

1

21

1.0 dB

1

0

1

0

22

2.0 dB

1

0

1

23

3.0 dB

1

0

24

4.0 dB

1

0

1

25

5.0 dB

1

0

1

0

26

6.0 dB

1

0

1

27

7.0 dB

1

0

28

8.0 dB

1

0

1

29

9.0 dB

1

0

30

10 dB

1

31

11 dB

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