micrf405 Micrel Semiconductor, micrf405 Datasheet - Page 36

• Manufacturer Part Number: micrf405
• Description: Micrf405 290mhz To 980mhz Ism Band Ask/fsk Transmitter
• Manufacturer: Micrel Semiconductor

April 2006
Low_Batt_en LowBatt_level
Micrel
ASKshape
XCO_Fast
XCOtune
0
1
1
1
1
ASK2
0..31
0..7
0
0
0
0
1
1
1
1
0
1
X
0
1
0
1
Comments
Programmable ASK filter. It can be programmed in eight steps. “0” is no shaping, “7” most shaping.
Comments
Programmable XCO load capacitor
Comments
The XCO is running on a constant bias current.
When going from PD to TX mode, the XCO is running on a high current during start up.
ASK1
0
0
1
1
0
0
1
1
Table 25. ASK Modulation Depth When PA[2:0]=7.
LDO_by
X
0
0
1
1
Table 27. XCO Capacitor Setting.
Table 26. ASK Shaping/Filtering.
Table 29. Low Battery Detect.
Table 28. XCO Fast Startup.
ASK0
Comments
Low battery detect circuit off
Low battery detect circuit active. Interrupt is flagged if VDD falls below
2V.
Low battery detect circuit active. Interrupt is flagged if VDD falls below
2.1V.
Low battery detect circuit active. Interrupt is flagged if VDD falls below
1.8V.
Low battery detect circuit active. Interrupt is flagged if VDD falls below
1.9V.
0
1
0
1
0
1
0
1
36
State
3dB ASK depth
6dB ASK depth
9dB ASK depth
12dB ASK depth
15dB ASK depth
18dB ASK depth
21dB ASK depth
> 30dB ASK depth
MICRF405
[phone]
M9999-041906