CC1020-RTR1 datasheet(54/95 Pages) TI1

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CC1020

SWRS046H – NOVEMBER 2006 – REVISED MARCH 2015

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In this mode, AGC_AVG in the VGA2 register must be set to 3. The channel 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 5-14). Manchester coding must always be used for OOK.

NOTE

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 by FILTER_CLK, which depends on the IF filter

bandwidth. There is a lower limit on FILTER_CLK and hence the AGC time constant. For very 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 2.4 kBaud.

Typical figures for the receiver sensitivity (BER = 10–3) are shown in Table 5-14 for OOK.

9.6 kBaud

Figure 5-29. OOK Eye Diagram

Table 5-14. Typical Receiver Sensitivity as a Function of Data Rate at 433 and 868 MHz, OOK Modulation,

BER = 10–3, Pseudo-random Data (PN9 Sequence)

SENSITIVITY [dBm]

DATA RATE

FILTER BW

433 MHz

868 MHz

[kBaud]

[kHz]

MANCHESTER MODE

2.4

9.6

–116

—

4.8

19.2

–113

–107

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

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