DSALPHA-3

Jul 09

©

2009 RF Solutions Ltd.

Page 8

ALPHA-TX

ALPHA-RX

x3..x0: select crystal load capacitor

To integrate the load capacitor internal can not only save cost, but also adjust reference frequency by

software

ms: select modulation polarity

m2..m0: select frequency deviation

.

3

．

．

．

． Power Management Command

bit

15

14

13

12

11

10

9

8

7

6

5

4

3

2

1

0

POR

1

1

0

0

0

0

0

0

a1

a0

ex

es

ea

eb

et

dc

C000h

a1： Crystal oscillator and synthesizer are enabled by Data transmit Command and disable by

Sleep command.

a0： Power amplifier is enabled by Data transmit Command and disable by Sleep Command.

ex：Enable crystal oscillator

es：Enable synthesizer

ea：Enable power amplifier

eb：Enable low battery detection funciton

et：Enable wake-up timer

dc：Disable output of CLK pin

4

．

．

．

． Frequency Setting Command

bit

15

14

13

12

11

10

9

8

7

6

5

4

3

2

1

0

POR

1

0

1

0

f11

f10

f9

f8

f7

f6

f5

f4

f3

f2

f1

f0

A7D0h

f11..f0: set operation frequency:

433band: Fc=430+F*0.0025 MHz

868band: Fc=860+F*0.0050 MHz

915band: Fc=900+F*0.0075 MHz

Fc is carrier frequency

x3

x2

x1

x0

Load capacitor [pF]

0

0

0

0

8.5

0

0

0

1

9.0

0

0

1

0

9.5

0

0

1

1

10.0

……

……

1

1

1

0

15.5

1

1

1

1

16.0

m2

m1

m0

0

0

0

30

0

0

1

60

0

1

0

90

0

1

1

120

1

0

0

150

1

0

1

180

1

1

0

210