AS3910-BQFP Просмотр технического описания (PDF) - austriamicrosystems AG
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AS3910-BQFP Datasheet PDF : 47 Pages
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AS3910
Data Sheet - Application Information
8.11.6 AM Modulation Depth and Antenna Driver Registers
Table 26. Modulation Depth Definition Register
Address # 10: Modulation Depth Definition Register
type: RW
Bit
Name
Def.
Function
0 → AM modulated level is defined by bits mod5 to mod0.
Level is adjusted automatically by Calibrate Modulation Depth
7
am_s
0 command
1 → AM modulated level is defined by bits dram7 to dram0.
Comments
6
mod5
0 MSB
5
mod4
0
4
mod3
0
3
mod2
0
See Application Notes for details about AM
modulation level definition.
2
mod1
0
1
mod0
LSB
0
Note: Default setting is set at power up and after Set Default command.
Table 27. Modulation Depth Display Register
Address # 11: Modulation Depth Display Register
Bit
Name
Function
7
md_7
MSB
6
md_6
5
md_5
4
md_4
3
md_3
2
md_2
1
md_1
0
md_0
LSB
type: R
Comments
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.
Note: At power up and after Set Default command content of this register is set to 0.
Table 28. Antenna Driver AM Modulated Level Definition
Address # 12: Antenna Driver AM Modulated Level Definition
type: RW
Bit
Name Def.
Function
Comments
7
dram7
0
MSB
6
dram6
0
5
dram5
0
4
dram4
0
3
dram3
0
2
dram2
0
Antenna drivers are composed of 8 binary weighted
segments. Setting a bit dram to 1 will disable
corresponding segment during AM modulated state in
case am_s bit is set to 1.
1
dram1
0
0
dram0
0
LSB
Note: Default setting is set at power up and after Set Default command.
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