MC13110A datasheet(52/68 Pages) MOTOROLA

Part #	MC13110A

Description	UNIVERSAL CORDLESS TELEPHONE SUBSYSTEM IC

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Manufacturer	MOTOROLA [Motorola, Inc]

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MC13110A/B MC13111A/B

52

MOTOROLA ANALOG IC DEVICE DATA

Gain Control Register

The gain control register contains bits which control the Tx

Voltage Gain, Rx Voltage Gain, and Carrier Detect threshold.

Operation of these latch bits are explained in Figures 124,

125 and 126.

Tx and Rx Gain Programming

The Tx and Rx audio signal paths each have a

programmable gain block. If a Tx or Rx voltage gain, other

than the nominal power–up default, is desired, it can be

programmed through the MPU interface. Alternately, these

programmable gain blocks can be used during final test of the

telephone to electronically adjust for gain tolerances in the

telephone system (see Figure 125). In this case, the Tx and

Rx gain register values should be stored in ROM during final

test so that they can be reloaded each time the IC is powered

up.

Figure 124. Gain Control Latch Bits

5–b Tx Gain Control

5–b Rx Gain Control

5–b CD Threshold Control

0

Figure 125. Tx and Rx Gain Control

Gain Control

Bit #4

Gain Control

Bit #3

Gain Control

Bit #2

Gain Control

Bit #1

Gain Control

Bit #0

Gain

Control #

Gain/Attenuation

Amount

–

<6

–9 dB

0

1

0

6

–9 dB

0

1

7

–8 dB

0

1

0

8

–7 dB

0

1

0

1

9

–6 dB

0

1

0

1

0

10

–5 dB

0

1

0

1

11

–4 dB

0

1

0

12

–3 dB

0

1

0

1

13

–2 dB

0

1

0

14

–1 dB

0

1

15

0 dB

1

0

16

1 dB

1

0

1

17

2 dB

1

0

1

0

18

3 dB

1

0

1

19

4 dB

1

0

1

0

20

5 dB

1

0

1

0

1

21

6 dB

1

0

1

0

22

7 dB

1

0

1

23

8 dB

1

0

24

9 dB

1

0

1

25

10 dB

–

>25

10 dB

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