mrf89xa Microchip Technology Inc., mrf89xa Datasheet - Page 122

• Manufacturer Part Number: mrf89xa
• Description: Ultra-low Power, Integrated Ism Band Sub-ghz Transceiver
• Manufacturer: Microchip Technology Inc.

MRF89XA
5.4.6
FIGURE 5-15:
FIGURE 5-16:
DS70622B-page 122
Note:
-1000
-300
ADJACENT CHANNEL REJECTION
In FSK mode, the unwanted signal is unmodulated (as described in the EN 300-220). Co-channel rejection (CCR, offset = 0 kHz) is
positive due to the DC cancellation process of the zero-IF architecture. In OOK mode, the polyphase filter efficiency is limited, thus
limiting the adjacent channel rejection at 2xFo distance.
-800
ACR IN FSK MODE
ACR IN OOK MODE
-200
-600
-400
-100
-200
Preliminary
Offset [kHz]
Offset [kHz]
70
60
50
40
30
20
10
-10
-20
0
60
50
40
30
20
10
0
0
0
200
100
400
© 2010 Microchip Technology Inc.
600
200
800
1000
300