CC1110-RTR1 datasheet(177/203 Pages) TI

177 / 203 page

CC1110

CC1110 PRELIMINARY Datasheet (Rev. 1.01) SWRS033A

Page 177 of 202

0xDF07: FSCTRL1 – Frequency synthesizer control

Bit

Field Name

Reset

R/W

Description

7:5

000

Not used

4:0

FREQ_IF[4:0]

01111

R/W

The desired IF frequency to employ in RX. Subtracted from

FS base frequency in RX and controls the digital complex

mixer in the demodulator.

FREQ

XOSC

210

⋅

The default value gives an IF frequency of 254 kHz,

assuming a 26.0 MHz crystal.

0xDF08: FSCTRL0 – Frequency synthesizer control

Bit

Field Name

Reset

R/W

Description

7:0

FREQOFF[7:0]

0x00

R/W

Frequency offset added to the base frequency before being

used by the FS. (2-complement).

Resolution is FXTAL/2

14 (1.5 kHz-1.7 kHz); range is ±186 kHz

to ±217 kHz, dependent of XTAL frequency.

The

SAFC strobe command and the automatic AFC

mechanism add the current FREQEST value to FREQOFF.

0xDF09: FREQ2 – Frequency control word, high byte

Bit

Field Name

Reset

R/W

Description

7:6

FREQ[23:22]

FREQ[23:22] is always (the FREQ2 register is less than 36 with 26MHz

or higher crystal)

CC1110-RTR1 Datasheet(PDF) 177 Page - Texas Instruments

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