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MICRF405 датащи(PDF) 29 Page - Micrel Semiconductor

номер детали MICRF405
подробное описание детали  290MHz-980MHz ISM Band ASK / FSK Transmitter
PDF  46 Pages
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производитель  MICREL [Micrel Semiconductor]
домашняя страница  http://www.micrel.com
Logo MICREL - Micrel Semiconductor

MICRF405 датащи(HTML) 29 Page - Micrel Semiconductor

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Micrel
MICRF405
April 2006
29
M9999-041906
(408) 955-1690
Ref
15 dBm
Att
50 dB
A
Center 915 MHz
Span 600 kHz
60 kHz/
* RBW 3 kHz
VBW 10 kHz
SWT 70 ms
1 PK
MAXH
-80
-70
-60
-50
-40
-30
-20
-10
0
10
1
Marker 1 [T1 ]
-23.62 dBm
915.018000000 MHz
1
Delta 1 [T1 ]
4.58 dB
-90.000000000 kHz
D2 -19 dBm
D1 1 dBm
Date: 27.MAR.2006
17:23:27
Figure 14. 33kbps, PA=6, ASK=7, ASKshape=2 (Fphd=2MHz, 209kHz internal loop filter).
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
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.



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