CC1020-RTR1 datasheet(13/95 Pages) TI1

13 / 95 page

CC1020

www.ti.com

SWRS046H – NOVEMBER 2006 – REVISED MARCH 2015

4.8

Crystal Oscillator

All measurements were performed using the two-layer PCB CC1020EMX reference design. See Figure 6-1. The electrical

specifications given for 868 MHz are also applicable for 902 to 928 MHz. TA = 25°C, AVDD = DVDD = 3.0 V,

fC = 14.7456 MHz if nothing else stated.

PARAMETER

MIN

TYP

MAX

UNIT

CONDITION

Recommended frequency is

Crystal Oscillator Frequency

4.9152

14.7456

19.6608

MHz

14.7456 MHz. See Section 5.16 for

details.

±5.7

ppm

433 MHz (EN 300 220)

868 MHz (EN 300 220)

Must be less than ±5.7 / ±2.8 ppm to

±2.8

ppm

Reference frequency

comply with EN 300 220 25 kHz channel

accuracy requirement(1)(2)

spacing at 433/868 MHz.

Must be less than ±4 ppm to comply with

±4

ppm

Japanese 12.5 kHz channel spacing

regulations (ARIB STD-T67).

C4 and C5 are loading capacitors. See

Crystal operation

Parallel

Section 5.16 for details.

4.9 to 6 MHz, 22 pF

recommended

Crystal load

6 to 8 MHz, 16 pF

capacitance

recommended

8 to 19.6 MHz, 16 pF

recommended

4.9152 MHz, 12 pF load

1.55

7.3728 MHz, 12 pF load

1.0

9.8304 MHz, 12 pF load

0.90

Crystal oscillator

start-up time

14.7456 MHz, 16 pF load

0.95

17.2032 MHz, 12 pF load

0.60

19.6608 MHz, 12 pF load

0.63

The external clock signal must be

connected to XOSC_Q1 using a DC

block (10 nF). Set XOSC_BYPASS = 0 in

External clock signal drive, sine wave

300

mVpp

the INTERFACE register when using an

external clock signal with low amplitude

or a crystal.

The external clock signal must be

connected to XOSC_Q1. No DC block

External clock signal drive, full-swing digital

0 – VDD

shall be used. Set XOSC_BYPASS = 1 in

external clock

the INTERFACE register when using a

full-swing digital external clock.

(1)

The reference frequency accuracy (initial tolerance) and drift (aging and temperature dependency) will determine the frequency

accuracy of the transmitted signal.

(2)

Crystal oscillator temperature compensation can be done using the fine step PLL frequency programmability and the AFC feature. See

Section 5.9.13 for details.

Specifications

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