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Low-Cost, 308MHz, 315MHz, and 433.92MHz
ASK Transceiver with Fractional-N PLL
Typical Operating Characteristics (continued)
(Typical Operating Circuit, V PAVDD = V AVDD = V DVDD = V HVIN = +3.0V, f RF = 433.92MHz, IF BW = 280kHz. 4kbps Manchester
encoded, 0.2% BER deviation = ±50kHz, T A = +25°C, unless otherwise noted.)
RECEIVER
S11 vs. RF FREQUENCY
S11 SMITH PLOT OF RFIN
0
-6
434MHz
-12
433.92MHz
-18
-24
400MHz
500MHz
200
250
300
350
400
450
500
RF FREQUENCY (MHz)
INPUT IMPEDANCE
vs. INDUCTIVE DEGENERATION
INPUT IMPEDANCE
vs. INDUCTIVE DEGENERATION
90
f RF = 315MHz
MAX7031 toc15
-220
90
f RF = 434MHz
MAX7031 toc16
-150
80
-230
80
-160
70
60
50
40
30
20
1
IMAGINARY
IMPEDANCE
10
REAL IMPEDANCE
100
-240
-250
-260
-270
-280
-290
70
60
50
40
30
20
1
IMAGINARY
IMPEDANCE
REAL IMPEDANCE
10
100
-170
-180
-190
-200
-210
-220
INDUCTIVE DEGENERATION (nH)
PHASE NOISE vs. OFFSET FREQUENCY
INDUCTIVE DEGENERATION (nH)
PHASE NOISE vs. OFFSET FREQUENCY
-50
-60
-70
-80
-90
-100
-110
-120
f RF = 315MHz
-50
-60
-70
-80
-90
-100
-110
-120
f RF = 434MHz
100
1k
10k
100k
1M
10M
100
1k
10k
100k
1M
10M
OFFSET FREQUENCY (Hz)
OFFSET FREQUENCY (Hz)
_______________________________________________________________________________________
7
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