CC1020-RTR1 datasheet(59/91 Pages) TI

59 / 91 page

CC1020

SWRS046

Page 59 of 92

The initial tolerance, temperature drift,

aging and load pulling should be carefully

specified in order to meet the required

frequency

accuracy

certain

application.

specifying

the

total

expected frequency accuracy in SmartRF®

Studio together with data rate and

frequency separation, the software will

estimate the total bandwidth and compare

to the available receiver channel filter

bandwidth. The software will report any

contradictions and a more accurate crystal

will be recommended if required.

XTAL

XOSC_Q1

XOSC_Q2

Figure 33. Crystal oscillator circuit

Item

CL= 12 pF

CL= 16 pF

CL= 22 pF

6.8 pF

15 pF

27 pF

6.8 pF

15 pF

27 pF

Table 28. Crystal oscillator component values

20.

Built-in Test Pattern Generator

The

CC1020 has a built-in test pattern

generator that generates a PN9 pseudo

random sequence. The PN9_ENABLE bit

in the MODEM register enables the PN9

generator. A transition on the DIO pin is

required after enabling the PN9 pseudo

random sequence.

The PN9 pseudo random sequence is

defined by the polynomial x

9 + x5 + 1.

The PN9 sequence is ‘XOR’ed with the

DIO signal in both TX and RX mode as

shown in Figure 34. Hence, by transmitting

only zeros (DIO = 0), the BER (Bit Error

Rate) can be tested by counting the

number of received ones. Note that the 9

first received bits should be discarded in

this case. Also note that one bit error will

generate 3 received ones.

Transmitting only ones (DIO = 1), the BER

can be tested by counting the number of

received zeroes.

The PN9 generator can also be used for

transmission of ‘real-life’ data when

measuring narrowband ACP (Adjacent

Channel Power), modulation bandwidth or

occupied bandwidth.

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