CC1020_17 Datasheet, PDF (12/95 Pages) Texas Instruments – Low-Power RF Transceiver for Narrowband Systems

CC1020
SWRS046H – NOVEMBER 2006 – REVISED MARCH 2015
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4.6 RSSI / Carrier Sense
All measurements were performed using the two-layer PCB CC1020EMX reference design. See Figure 6-1. The electrical
specifications given for 868 MHz are also applicable for 902 to 928 MHz. T_A = 25°C, AVDD = DVDD = 3.0 V,
f_C = 14.7456 MHz if nothing else stated.
PARAMETER
TYP UNIT
CONDITION
RSSI dynamic range
55
dB 12.5 and 25 kHz channel spacing
RSSI accuracy
±3
dB See Section 5.9.5 for details.
RSSI linearity
±1
dB
RSSI attach time
2.4 kBaud, 12.5 kHz channel spacing
4.8 kBaud, 25 kHz channel spacing
153.6 kBaud, 500 kHz channel spacing
3.8
ms Shorter RSSI attach times can be traded for
1.9
ms
lower RSSI accuracy. See Section 5.9.5 for
details.
Shorter RSSI attach times can also be traded
140
µs
for reduced sensitivity and selectivity by
increasing the receiver channel filter
bandwidth.
Carrier sense programmable range
40
dB Accuracy is as for RSSI
12.5 kHz channel spacing
Adjacent channel carrier
sense
25 kHz channel spacing
–72 dBm At carrier sense level –110 dBm, FM jammer
(1 kHz sine, ±2.5 kHz deviation) at adjacent
channel.
Adjacent channel carrier sense is measured
–72
dBm _{by applying a signal on the adjacent channel}
and observe at which level carrier sense is
indicated.
Spurious carrier sense
At carrier sense level –110 dBm, 100 MHz to
–70 dBm 2 GHz. Adjacent channel and image channel
are excluded.
4.7 Intermediate Frequency (IF)
All measurements were performed using the two-layer PCB CC1020EMX reference design. See Figure 6-1. The electrical
specifications given for 868 MHz are also applicable for 902 to 928 MHz. T_A = 25°C, AVDD = DVDD = 3.0 V,
f_C = 14.7456 MHz if nothing else stated.
PARAMETER
TYP
UNIT
CONDITION
Intermediate frequency (IF)
307.2
kHz
See Section 5.9.1 for details.
Digital channel filter bandwidth
9.6 to 307.2
The channel filter 6 dB bandwidth is
kHz
programmable from 9.6 kHz to 307.2 kHz. See
Section 5.9.2 for details.
AFC resolution
At 2.4 kBaud
150
Hz
Given as Baud rate / 16. See Section 5.9.3 for
details.
12
Specifications
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