CC1020_1070DK-868 datasheet(8/57 Pages) TI

Part #	CC1020_1070DK-868

Description	Single Chip Low Power RF Transmitter for Narrowband Systems

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CC1070

SWRS043

Page 8 of 58

4.2 Crystal Oscillator Section

Parameter

Min.

Typ.

Max.

Unit

Condition / Note

Crystal Oscillator Frequency

4.9152

14.7456

19.6608

MHz

Crystal operation

Parallel

C4 and C5 are loading

capacitors. See section 17 on

page 34 for details.

Crystal load capacitance

12

22

16

30

16

pF

4-6 MHz, 22 pF recommended

6-8 MHz, 16 pF recommended

8-20 MHz, 16 pF recommended

Crystal oscillator start-up time

1.55

0.90

0.95

0.63

ms

4.9152 MHz, 12 pF load

9.8304 MHz, 12 pF load

14.7456 MHz, 16 pF load

19.6608 MHz, 12 pF load

External clock signal drive,

sine wave

300

mVpp

The external clock signal must be

connected to XOSC_Q1 using a

DC block (10 nF). Set

XOSC_BYPASS = 0 in the

INTERFACE register when using

an external clock signal with low

amplitude or a crystal.

External clock signal drive,

full-swing digital external clock

0 - VDD

V

The external clock signal must be

connected to XOSC_Q1. No DC

block shall be used. Set

XOSC_BYPASS = 1 in the

INTERFACE register when using

a full-swing digital external clock

Reference frequency accuracy

requirement

+/- 5.7

+/- 2.8

+/- 4

+/- 7

ppm

433 MHz (EN 300 220)

868 MHz (EN 300 220)

Must be less than ±5.7 / ±2.8

ppm to comply with EN 300 220

25 kHz channel spacing at

433/868 MHz.

Must be less than ±4 ppm to

comply with Japanese 12.5 kHz

channel spacing regulations

(ARIB STD T-67). NOTE: This

imposes special requirements on

the receiver of the signal.

Must be less than ±7 ppm to

comply with Korean 12.5 kHz

channel spacing regulations.

NOTE: This imposes special

requirements on the receiver of

the signal.

NOTE:

The reference frequency

accuracy (initial tolerance) and

drift (aging and temperature

dependency) will determine the

frequency accuracy of the

transmitted signal.

Crystal oscillator temperature

compensation can be done using

the fine frequency

programmability.

Table 4. Crystal oscillator parameters

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