CC1070-RTY1 datasheet(23/57 Pages) TI

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CC1070

SWRS043

Page 23 of 58

Crystal frequency [MHz]

Data rate

[kBaud]

4.9152

7.3728

9.8304

12.288

14.7456

17.2032

19.6608

0.45

0.5

0.6

0.9

1.2

1.8

2.4

3.6

4.096

4.8

7.2

8.192

9.6

14.4

16.384

19.2

28.8

32.768

38.4

57.6

65.536

76.8

115.2

128

153.6

Table 14. Some possible data rates versus crystal frequency

11 Frequency Programming

Programming the frequency word in the

configuration registers sets the operation

frequency. There are two frequency words

registers, termed FREQ_A and FREQ_B,

which can be programmed to two different

frequencies. They can be used for two

different channels. The F_REG bit in the

MAIN register selects frequency word A or

The

frequency

word

located

FREQ_2A:FREQ_1A:FREQ_0A

and

FREQ_2B:FREQ_1B:FREQ_0B for the

FREQ_A and FREQ_B word respectively.

The LSB of the FREQ_0 registers are

used to enable dithering, section 11.1.

The PLL output frequency is given by:

⎟

⎠

⎞

⎜

⎝

⎛

⋅

32768

DITHER

FREQ

ref

in the frequency band 402 – 470 MHz, and

⎟

⎠

⎞

⎜

⎝

⎛

⋅

16384

DITHER

FREQ

ref

in the frequency band 804 – 940 MHz.

The BANDSELECT bit in the ANALOG

BANDSELECT = 0 gives 402 – 470 MHz,

and BANDSELECT = 1 gives 804 - 940

MHz.

The reference frequency is the crystal

oscillator clock frequency divided by

REF_DIV (3 bits in the CLOCK_A or

CLOCK_B register), a number between 1

and 7:

DIV

REF

xosc

ref

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