Datasheet

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)
10.910.810.710.610.5
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)
252015105
-10
0
10
20
30
40
50
-20
030
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)
11085603510-15-40
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)
450400350300250
-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 Application Circuit , V
PAVDD
= V
AVDD
= V
DVDD
= V
HVIN
= +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