EVB71121 Datasheet, PDF (8/18 Pages) Melexis Microelectronic Systems – 300 to 930MHz Receiver Evaluation Board Description

2.2 Standard Frequency Plans
IF2 = 1.8MHz.
RFSEL
0
f_RF [MHz]
315
433.92
f_IF1 [MHz]
107.40
147.04
868.3
288.23
1
915
303.80
EVB71121
300 to 930MHz Receiver
Evaluation Board Description
f_LO1 [MHz]
422.40
580.96
580.07
611.20
f_LO2 [MHz]
105.60
145.24
290.03
305.60
f_RO [MHz]
17.600000
24.206667
24.169444
25.466667
2.3 433/868MHz Frequency Diversity
The receiver’s multi-band functionality can be used to operate at two different frequency bands just by
changing the logic level at pin RFSEL and without changing the crystal. This feature is applicable for
common use of the 433 and 868MHz bands. Below table shows the corresponding frequency plans.
IF2 = 1.8MHz.
RFSEL
0
1
f_RF [MHz]
f_IF1 [MHz]
f_LO1 [MHz]
f_LO2 [MHz]
f_RO [MHz]
433.25
146.82
580.07
145.02
PRELIMINARY ^868.3
288.23
580.07
290.03
24.169444
39012 71121 01
Rev. 003
Page 8 of 18
EVB Description
Jan/08