Rainbow Electronics MAX7042 - Manual (Page 7)

MAX7042
308MHz/315MHz/418MHz/433.92MHz
Low-Power, FSK Superheterodyne Receiver
_______________________________________________________________________________________ 7
S11 SMITH PLOT OF R FIN
MAX7042 toc19
433.92MHz
INPUT IMPEDANCE
vs. INDUCTIVE DEGENERATION
MAX7042 toc20
INDUCTIVE DEGENERATION (nH)
REAL IMPEDANCE (
Ω
)
10
30
40
50
60
70
20
IMAGINARY IMPEDANCE (
Ω
)
-190
-180
-170
-160
-150
-200
1 100
f RF = 315MHz
IMAGINARY
IMPEDANCE
REAL IMPEDANCE
INPUT IMPEDANCE
vs. INDUCTIVE DEGENERATION
MAX7042 toc21
INDUCTIVE DEGENERATION (nH)
REAL IMPEDANCE (
Ω
)
10
30
40
50
60
70
80
90
20
IMAGINARY IMPEDANCE (
Ω
)
-130
-120
-110
-100
-140
1 100
f RF = 433.92MHz
IMAGINARY
IMPEDANCE
REAL IMPEDANCE
-70
-130
100 10k 1k 100k 1M 10M
PHASE NOISE
vs. OFFSET FREQUENCY
-120
-110
-90
-100
-80
MAX7042 toc22
OFFSET FREQUENCY (Hz)
PHASE NOISE (dBc/Hz)
f RF = 315MHz
f RF = 433.92MHz
Typical Operating Characteristics (continued)
(Typical Application Circuit, V
DD
= 3.0V, f
RF
= 433.92MHz, IF BW = 280kHz, data rate = 4kbps Manchester encoded, frequency
deviation = ±50kHz, BER = 0.2%, T A = +25°C, unless otherwise noted.)