CC400-RTR2 datasheet(18/31 Pages) TI

18 / 31 page

CC400

SWRS050

Page 18 of 32

Item

CL= 12 pF

CL= 16 pF

CL= 22 pF

C151

15 pF

22 pF

33 pF

C161

15 pF

22 pF

33 pF

Table 14: Crystal oscillator component values.

22.

Loop filter

The loop filter is a lead-lag type of filter.

The

calculations

for

the

loop

filter

components are done in the SmartRF

Studio software.

See Application Note AN012 “VCO fine

tuning for CC400 and CC900” for more

detailed

information.

spreadsheet,

CC400_CC900_Loop_Filter_1_0.xls,

available from Chipcon that will calculate

the loop filter components for a desired

bandwidth with different constants than the

default

values

SmartRF

Studio.

23.

Blocking

-10

420

425

430

435

440

445

450

Fre quency

Requirement

IF =60 kHz, Separation = 20 kHz. Data

rate = 1.2 kbps. Interfering signal is CW

(no modulation) or FM modulation.

-10

420

425

430

435

440

445

450

Fre quency

Requirement

IF =200 kHz, Separation = 40 kHz. Data

rate = 1.2 kbps. Interfering signal is CW

(no modulation) or FM modulation.

-10

420

425

430

435

440

445

450

Frequency

Requirement

IF =455 kHz external, Separation = 12

kHz. Data rate = 1.2 kbps. Interfering

signal is CW (no modulation) or FM

modulation.

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