MLX71121_15 Datasheet, PDF (16/29 Pages) Melexis Microelectronic Systems – FSK/OOK Receiver

2.3 Standard Frequency Plans
IF2 = 1.8MHz
RFSEL
0
1
f_RF [MHz]
315
433.92
868.3
915
f_IF1 [MHz]
107.40
147.04
288.23
303.80
f_LO1 [MHz]
422.40
580.96
580.07
611.20
MLX71121
300 to 930MHz
FSK/OOK Receiver
f_LO2 [MHz]
105.60
145.24
290.03
305.60
f_RO [MHz]
17.600000
24.206667
24.169444
25.466667
2.4 433/868MHz 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 com-
mon use of the 433 and 868MHz bands. Below table shows the corresponding frequency plans.
IF2 = 1.8MHz
RFSEL
0
1
f_RF [MHz]
433.25
868.3
f_IF1 [MHz]
146.82
288.23
f_LO1 [MHz]
580.07
580.07
f_LO2 [MHz]
145.02
290.03
f_RO [MHz]
24.169444
39010 71121
Rev. 012
Page 16 of 29
Data Sheet
Mar/15