CC1021-RTR1 datasheet(36/92 Pages) TI

36 / 92 page

CC1021

SWRS045

Page 36 of 91

increase the number of RSSI reads N. A

good starting point is N=8. As accuracy is

more important in the last fine-calibration

steps, it can be worthwhile to increase N

for each loop iteration.

For high frequency deviation and high data

rates (typically ≥ 76.8 kBaud) the analog

filter succeeding the mixer must be

bypassed by setting FILTER_BYPASS = 1

in the FILTER register. In this case the

image rejection is degraded.

The image rejection is reduced for low

supply voltages (typically <2.5 V) when

operating in the 402 ñ 470 MHz frequency

range.

12.7. Blocking and Selectivity

Figure 16 shows the blocking/selectivity

for 102.4 kHz channel filter bandwidth at

433 MHz and 19.2 kBaud data rate. Figure

17 shows the blocking/selectivity for 102.4

kHz channel filter bandwidth at 433 MHz

and 38.4 kBaud data rate. Figure 18

shows the blocking/selectivity for 102.4

kHz channel filter bandwidth at 868 MHz

and 19.2 kBaud data rate.

Figure 19

shows the blocking/selectivity for 102.4

kHz channel filter bandwidth at 868 MHz

and 38.4 kBaud data rate. The blocking

rejection is the ratio between a blocker

(interferer) and a wanted signal 3 dB

above the sensitivity limit.

-15

-10

-5

-1000

-900

-800

-700

-600

-500

-400

-300

-200

-100

100

200

300

400

500

600

700

800

900

1000

Blocker frequency offset [kHz]

Not image calibrated

Image calibrated

Figure 16. Typical blocker rejection. Carrier frequency set to 434.3072 MHz (102.4 kHz

channel filter bandwidth, 19.2 kBaud)

CC1021-RTR1 Datasheet(PDF) 36 Page - Texas Instruments

CC1021-RTR1 Datasheet(HTML) 36 Page - Texas Instruments

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92

Datasheet Descarga

Enlace URL