Rainbow Electronics MAX7032 - Manual (Page 8)

MAX7032
Low-Cost, Crystal-Based, Programmable,
ASK/FSK Transceiver with Fractional-N PLL
8 _______________________________________________________________________________________
FSK DEMODULATOR OUTPUT
vs. IF FREQUENCY
MAX7032 toc11
IF FREQUENCY (MHz)
FSK DEMODULATOR OUTPUT (V)
10.9 10.8 10.7 10.6 10.5
0.4
0.8
1.2
1.6
0
10.4 11.0
SYSTEM GAIN vs. IF FREQUENCY
MAX7032 toc12
IF FREQUENCY (MHz)
SYSTEM GAIN (dBm)
25 20 15 10 5
-10
0
10
20
30
40
50
-20
0 30
LOWER SIDEBAND
UPPER SIDEBAND
FROM RFIN
TO MIXOUT
f RF = 434MHz
48dB IMAGE
REJECTION
IMAGE REJECTION vs. TEMPERATURE
MAX7032 toc13
IMAGE REJECTION (dB)
44
46
48
42
TEMPERATURE ( °C)
110 85 60 35 10 -15 -40
f RF = 434MHz
f RF = 315MHz
NORMALIZED IF GAIN vs. IF FREQUENCY
MAX7032 toc14
IF FREQUENCY (MHz)
NORMALIZED IF GAIN (dB)
10
-16
-12
-8
-4
0
-20
1 100
S11 vs. RF FREQUENCY
MAX7032 toc15
RF FREQUENCY (MHz)
S11 (dB)
450 400 350 300 250
-18
-12
-6
0
-24
200 500
433.92MHz
S11 SMITH PLOT OF RFIN
MAX7032 toc16
434MHz
500MHz
400MHz
INPUT IMPEDANCE
vs. INDUCTIVE DEGENERATION
MAX7032 toc17
INDUCTIVE DEGENERATION (nH)
REAL IMPEDANCE (
Ω
)
10
30
40
50
60
70
80
90
20
IMAGINARY IMPEDANCE (
Ω
)
-280
-270
-260
-250
-240
-230
-220
-290
1 100
f RF = 315MHz
IMAGINARY
IMPEDANCE
REAL IMPEDANCE
INPUT IMPEDANCE
vs. INDUCTIVE DEGENERATION
MAX7032 toc18
INDUCTIVE DEGENERATION (nH)
REAL IMPEDANCE (
Ω
)
10
30
40
50
60
70
80
90
20
IMAGINARY IMPEDANCE (
Ω
)
-210
-200
-190
-180
-170
-160
-150
-220
1 100
f RF = 434MHz
IMAGINARY
IMPEDANCE
REAL IMPEDANCE
Typical Operating Characteristics (continued)
(Typical Operating Circuit, PAV DD = AV DD = DV DD = HV IN = +3.0V, f RF = 433.92MHz, T A = +25°C, IF BW = 280kHz, data rate =
4kbps Manchester encoded, frequency deviation = ±50kHz, BER = 0.2% average RF power, unless otherwise noted.)
RECEIVER