Baseband Signal Processor

13

MX829 PRELIMINARY INFORMATION

© 1998 MX

•COM Inc.

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Doc. # 20480160.004

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5.2.7 MOD LEVELS Register (Hex address $12)

The six least significant bits of the first byte in this register are used to set the attenuation of the Modulator 1 amplifier and

the five least significant bits of the second byte in this register are used to set the attenuation of the Modulator 2 amplifier,

according to the tables below:

5

4

3

2

1

0

Mod. 1 Attenuation

4

3

2

1

0

Mod. 2 Attenuation

0

X

X

X

X

X

1

0

0

0

0

0

>40dB

0

0

0

0

0

>40dB

10

00

01

12.0dB

00

00

1

6.0dB

10

00

10

11.6dB

00

01

0

5.8dB

10

00

11

11.2dB

00

01

1

5.6dB

10

01

00

10.8dB

00

10

0

5.4dB

10

01

01

10.4dB

00

10

1

5.2dB

10

01

10

10.0dB

00

11

0

5.0dB

10

01

11

9.6dB

00

11

1

4.8dB

10

10

00

9.2dB

01

00

0

4.6dB

10

10

01

8.8dB

01

00

1

4.4dB

10

10

10

8.4dB

01

01

0

4.2dB

10

10

11

8.0dB

01

01

1

4.0dB

10

11

00

7.6dB

01

10

0

3.8dB

10

11

01

7.2dB

01

10

1

3.6dB

10

11

10

6.8dB

01

11

0

3.4dB

10

11

11

6.4dB

01

11

1

3.2dB

11

00

00

6.0dB

10

00

0

3.0dB

11

00

01

5.6dB

10

00

1

2.8dB

11

00

10

5.2dB

10

01

0

2.6dB

11

00

11

4.8dB

10

01

1

2.4dB

11

01

00

4.4dB

10

10

0

2.2dB

11

01

01

4.0dB

10

10

1

2.0dB

11

01

10

3.6dB

10

11

0

1.8dB

11

01

11

3.2dB

10

11

1

1.6dB

11

10

00

2.8dB

11

00

0

1.4dB

11

10

01

2.4dB

11

00

1

1.2dB

11

10

10

2.0dB

11

01

0

1.0dB

11

10

11

1.6dB

11

01

1

0.8dB

11

11

00

1.2dB

11

10

0

0.6dB

11

11

01

0.8dB

11

10

1

0.4dB

11

11

10

0.4dB

11

11

0

0.2dB

11

11

11

0dB

11

11

1

0dB

X = don't care

MOD1 ENABLE

(Bit 5, first byte)

When this bit is "1" the MOD1 attenuator is enabled.

When this bit is "0" the MOD1 attenuator is disabled (i.e. powersaved).

Bits 6 and 7 in the first byte and bits 5, 6 and 7 in the second byte should always be set to "0". MOD

LEVELS (1) register is loaded first.

Note: The MOD2 attenuator is enabled by the AMP2 ENABLE signal (bit 6 of CONTROL1 register).