Analog Devices ADF7021-V Manual page 19

0.6
0.5
0.4
0.3
0.2
0.1
0
–130 –125 –120
RF INPUT POWER (dBm)
Figure 23. 2FSK Sensitivity vs. V
0.6
0.5
0.4
0.3
0.2
0.1
0
–130 –125 –120
RF INPUT POWER (dBm)
Figure 24. 2FSK Sensitivity vs. V
100
90
80
70
60
50
40
30
20
10
0
–10
–20 –15 –10 –5
FREQUENCY OFFSET (MHz)
Figure 25. Wideband Interference Rejection (Modulated Carrier Is Swept 20 MHz
Either Side of an 868 MHz Modulated GFSK 2.4 kHz/4.8 kbps Wanted Signal at the
Sensitivity Point (−106.5 dBm); the Power Level of the Blocker Is Adjusted to
−2
Give a BER of 10 ; Interferer Is a GFSK PRBS15 4.8 kHz/2.4 kHz Signal)
DATA RATE = 1.2kbps
f = 2.4Hz
DEV
RF FREQ = 868MHz
IFBW = 9kHz
–40°C, 2.3V
–40°C, 3V
–40°C, 3.6V
+25°C, 2.3V
+25°C, 3V
+25°C, 3.6V
+85°C, 2.3V
+85°C, 3V
+85°C, 3.6V
–115 –110 –105
and Temperature at 868 MHz
DD
DATA RATE = 1.2kbps
f = 2.4Hz
DEV
RF FREQ = 460MHz
IFBW = 9kHz
–40°C, 2.3V
–40°C, 3V
–40°C, 3.6V
+25°C, 2.3V
+25°C, 3V
+25°C, 3.6V
+85°C, 2.3V
+85°C, 3V
+85°C, 3.6V
–115 –110 –105
and Temperature at 460 MHz
DD
0 5 10 15 20
–20
–40
–60
–80
–100
–120
–140
–122.5 –112.5 –102.5 –92.5
80
70
60
50
40
30
20
10
0
–10
Figure 27. Image Rejection, Uncalibrated vs. Calibrated
2.5
0
+90°C
–2.5
–5.0
–7.5
–10.0
–12.5
–15.0
–17.5
–20.0
–22.5
–25.0
–27.5
–30.0
–32.5
–35.0
–37.5
90 92
Figure 28. Variation of IF Filter Response with Temperature
(IF_FILTER_BW = 9 kHz, Temperature Range Is −40°C to +90°C in 10° Steps)
Rev. 0 | Page 19 of 60
READBACK LEVEL
ACTUAL RF INPUT LEVEL
–82.5 –72.5 –62.5
RF INPUT POWER (dBm)
Figure 26. Digital RSSI Readback Linearity
CALIBRATED
UNCALIBRATED
BLOCKER FREQUENCY (MHz)
–40°C
94 96 98 100 102 104
IF FREQUENCY (kHz)
ADF7021-V
RSSI
–52.5 –42.5
106 108 110