AS3909 datasheet(46/77 Pages) AMSCO

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AS3909/AS3910 – 46

ams Datasheet, Confidential: 2013-Oct [3-02]

A p pl i c at io n I n f o r m at i o n

AM Modulation Depth and Antenna Driver Registers

Figure 38:

Modulation Depth Definition Register

Note: Default setting is set at power up and after Set Default command.

Figure 39:

Modulation Depth Display Register

Note: At power up and after Set Default command content of this register is set to 0.

Address # 10: Modulation Depth Definition Register

Type: RW

Bit

Name

Def.

Function

Comments

7am_s0

→ AM modulated level is defined by

bits mod5 to mod0. Level is adjusted

automatically by Calibrate Modulation

Depth command

→ AM modulated level is defined by

bits dram7 to dram0.

6mod5

MSB

See Application Notes for details

about AM modulation level definition.

5mod4

4mod3

3mod2

2mod1

1mod0

LSB

Address # 11: Modulation Depth Display Register

Type: R

Bit

Name

Function

Comments

7md_7

MSB

Displays result of Calibrate Modulation Depth

command. Antenna drivers are composed of

8 binary weighted segments. Bit md_x set to

one indicates that this particular segment

will be disabled during AM modulated state.

6md_6

5md_5

4md_4

3md_3

2md_2

1md_1

0md_0

LSB

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