CC1021-RTR1 datasheet(57/92 Pages) TI

57 / 92 page

CC1021

SWRS045

Page 57 of 91

the "carrier sense" level (programmed as

CS_LEVEL in the VGA4 register). The

signal is then decimated and filtered in the

data

filter.

Data

decision

and

bit

synchronization are as for FSK reception.

In this mode AGC_AVG in the VGA2

bandwidth must be 4 times the Baud rate

for data rates up to 9.6 kBaud. For the

highest data rates the channel bandwidth

must be 2 times the Baud rate (see Table

27). Manchester coding must always be

used for OOK.

Note that the automatic frequency control

(AFC) cannot be used when receiving

OOK, as it requires a frequency shift.

The AGC has a certain time-constant

determined

FILTER_CLK,

which

depends on the IF filter bandwidth. There

is a lower limit on FILTER_CLK and hence

the AGC time constant. For low data rates

the minimum time constant is too fast and

the AGC will increase the gain when a "0"

is received and decrease the gain when a

"1" is received. For this reason the

minimum data rate in OOK is 9.6 kBaud.

Typical figures for the receiver sensitivity

(BER = 10 3) are shown in Table 27 for

OOK.

Figure 32. OOK eye diagram. 9.6 kBaud.

Sensitivity [dBm]

Data rate

[kBaud]

Filter BW

[kHz]

433 MHz

Manchester mode

868 MHz

Manchester mode

9.6

38.4

-103

-104

19.2

51.2

-102

-101

38.4

102.4

-95

-97

76.8

153.6

-92

-94

153.6

307.2

-81

-87

Table 27. Typical receiver sensitivity as a function of data rate at 433 and 868 MHz, OOK

modulation, BER = 10 3, pseudo-random data (PN9 sequence).

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