Digitally Controlled Analog I/O Processor

11

MX839 PRELIMINARY INFORMATION

© 1998 MX

xCOM Inc.

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Fax: 336 744-5054

Doc. # 20480164.002

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4.7.3

VARIABLE ATTENUATOR Register (Hex address $D2)

This is a 16-bit register. Byte (1) is sent first. Bits 0 - 5 of the first byte in this register are used to enable and set the

attenuation of the Modulator 1 amplifier. Bits 0 - 5 of the second byte in this register are used to enable and set the

attenuation of the Modulator 2 amplifier. See Table 7.

5

4

3

2

1

0

Mod. 1 Attenuation

5

4

3

2

1

0

Mod. 2 Attenuation

0

X

X

X

X

X

0

X

X

X

X

X

1

0

0

0

0

0

>40dB

1

0

0

0

0

0

>40dB

10

00

01

12.0dB

10

00

01

6.0dB

10

00

10

11.6dB

10

00

10

5.8dB

10

00

11

11.2dB

10

00

11

5.6dB

10

01

00

10.8dB

10

01

00

5.4dB

10

01

01

10.4dB

10

01

01

5.2dB

10

01

10

10.0dB

10

01

10

5.0dB

10

01

11

9.6dB

10

01

11

4.8dB

10

10

00

9.2dB

10

10

00

4.6dB

10

10

01

8.8dB

10

10

01

4.4dB

10

10

10

8.4dB

10

10

10

4.2dB

10

10

11

8.0dB

10

10

11

4.0dB

10

11

00

7.6dB

10

11

00

3.8dB

10

11

01

7.2dB

10

11

01

3.6dB

10

11

10

6.8dB

10

11

10

3.4dB

10

11

11

6.4dB

10

11

11

3.2dB

11

00

00

6.0dB

11

00

00

3.0dB

11

00

01

5.6dB

11

00

01

2.8dB

11

00

10

5.2dB

11

00

10

2.6dB

11

00

11

4.8dB

11

00

11

2.4dB

11

01

00

4.4dB

11

01

00

2.2dB

11

01

01

4.0dB

11

01

01

2.0dB

11

01

10

3.6dB

11

01

10

1.8dB

11

01

11

3.2dB

11

01

11

1.6dB

11

10

00

2.8dB

11

10

00

1.4dB

11

10

01

2.4dB

11

10

01

1.2dB

11

10

10

2.0dB

11

10

10

1.0dB

11

10

11

1.6dB

11

10

11

0.8dB

11

11

00

1.2dB

11

11

00

0.6dB

11

11

01

0.8dB

11

11

01

0.4dB

11

11

10

0.4dB

11

11

10

0.2dB

11

11

11

0dB

11

11

11

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).

MOD2 ENABLE

(Bit 5, second byte)

When this bit is '1' the MOD2 attenuator is enabled.

When this bit is '0' the MOD2 attenuator is disabled (i.e. powersaved).

(Bits 7 and 6, first

and second bytes)

Reserved for future use. These should be set to '0'.

Table 7: VARIABLE ATTENUATOR Register (Hex address $D2)