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CC1021-RTR1 датащи(PDF) 59 Page - Texas Instruments

номер детали CC1021-RTR1
подробное описание детали  Single Chip Low Power RF Transceiver for Narrowband Systems
PDF  92 Pages
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производитель  TI [Texas Instruments]
домашняя страница  http://www.ti.com
Logo TI - Texas Instruments

CC1021-RTR1 датащи(HTML) 59 Page - Texas Instruments

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CC1021
SWRS045
Page 59 of 91
Item
CL= 12 pF
CL= 16 pF
CL= 22 pF
C4
6.8 pF
15 pF
27 pF
C5
6.8 pF
15 pF
27 pF
Table 28. Crystal oscillator component values
20.
Built-in Test Pattern Generator
The CC1021 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 x9 + x5 + 1.
The PN9 sequence is ëXORíed 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 ëreal-lifeí data when
measuring narrowband ACP (Adjacent
Channel Power), modulation bandwidth or
occupied bandwidth.
8
7
6
5
4
3
2
1
0
XOR
XOR
Tx out (modulating signal)
Tx data (DIO pin)
8
7
6
5
4
3
2
1
0
XOR
XOR
Rx pseudo random sequence
Rx in (Demodulated Rx data)
Rx out (DIO pin)
Tx pseudo random sequence
Figure 34. PN9 pseudo random sequence generator in TX and RX mode



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