CC1020-RTR1 datasheet(12/91 Pages) TI

12 / 91 page

CC1020

SWRS046

Page 12 of 92

4.5.

Crystal Oscillator Section

Parameter

Min

Typ

Max

Unit

Condition / Note

Crystal Oscillator Frequency

4.9152

14.7456

19.6608

MHz

Recommended frequency is

14.7456 MHz. See section 19 on

page 58 for details.

Reference frequency accuracy

requirement

+/- 5.7

+/- 2.8

+/- 4

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:

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 step PLL frequency

programmability and the AFC

feature. See section 12.13 on

page 41 for details.

Crystal operation

Parallel

C4 and C5 are loading

capacitors. See section 19 on

page 58 for details.

Crystal load capacitance

4.9-6 MHz, 22 pF recommended

6-8 MHz, 16 pF recommended

8-19.6 MHz, 16 pF recommended

Crystal oscillator start-up time

1.55

1.0

0.90

0.95

0.60

0.63

4.9152 MHz, 12 pF load

7.3728 MHz, 12 pF load

9.8304 MHz, 12 pF load

14.7456 MHz, 16 pF load

17.2032 MHz, 12 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

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.

Table 7. Crystal oscillator parameters

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