MICRF405 datasheet(29/46 Pages) MICREL

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Micrel

MICRF405

April 2006

M9999-041906

(408) 955-1690

Ref

15 dBm

Att

50 dB

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

Marker 1 [T1 ]

-23.62 dBm

915.018000000 MHz

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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