micrf405 Micrel Semiconductor, micrf405 Datasheet - Page 29

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

April 2006
Spread Spectrum ASK™ is a combination of
traditional ASK combined with FSK dithering. This
modulation type goes under FCC part 15.247 digital
modulation allowing higher output power without
FHSS. The FSK dithering frequency, applied to the
ASK signal, is greater than the ASK data rate and
therefore, a traditional ASK/OOK receiver with
Figure 14. 33kbps, PA=6, ASK=7, ASKshape=2 (Fphd=2MHz, 209kHz internal loop filter).
Date: 27.MAR.2006
1 PK
MAXH
Ref
Center 915 MHz
10
0
-10
-20
-30
-40
-50
-60
-70
-80
15 dBm
D1 1 dBm
D2 -19 dBm
17:23:27
Att
1
50 dB
60 kHz/
*
1
RBW 3 kHz
VBW 10 kHz
SWT 70 ms
29
500kHz noise bandwidth can be used. FSK is
applied using divider modulation Modulation[1:0]=2,
due to the high loop filter bandwidth requirement of
the ASK modulation. The ASK_PN_en signal
controls whether the dithering is a “010101”-pattern,
ASK_PN_en=0, or a “111101011001000”-pattern,
ASK_PN_en=1.
Marker 1 [T1 ]
Delta 1 [T1 ]
915.018000000 MHz
-90.000000000 kHz
Span 600 kHz
-23.62 dBm
4.58 dB
A
[phone]
M9999-041906