Wideband I/Q Modulator with Sigma-Delta
Fractional-N Synthesizer
Typical Operating Characteristics
(MAX2150 EV kit. V CC = +3V, SHDN = PLLEN = TXEN = high, BUFEN = low. Input I/Q signals: F I/Q = 500kHz, V I/Q = 1V P-P . I+, Q+ sin-
gle-ended input, driven from AC-coupled source. I-, Q- single-ended inputs are AC-coupled to GND. RFOUT and BUFOUT output ports
are terminated in 50 Ω loads. f LO =1750MHz, P LO = -10dBm, T A = +25°C, unless otherwise noted.)
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MODULATION OUTPUT POWER
vs. FREQUENCY
MODULATION OUTPUT POWER
vs. FREQUENCY
100
80
60
40
TX MODE
+85 ° C
+25 ° C
-40 ° C
4
2
0
-2
-4
-6
TXEN = HIGH
+85 ° C
-40 ° C
+25 ° C
-55
-58
-61
-64
TXEN = LOW
-40 ° C
+25 ° C
+85 ° C
-8
20
-10
-67
0
-12
-70
2.7
3.0
3.3
3.6
700
1100
1500
1900
2300
700
1100
1500
1900
2300
-1.0
SUPPLY VOLTAGE (V)
OUTPUT POWER vs. LO POWER
38
FREQUENCY (MHz)
CARRIER AND SIDEBAND
SUPPRESSIONS vs. LO POWER
4
FREQUENCY (MHz)
MODULATOR OUTPUT POWER
vs. I/Q INPUT LEVEL
-1.1
-1.2
-1.3
-1.4
37
36
SIDEBAND SUPPRESSION
0
-4
-8
-40 ° C
+25 ° C
-1.5
35
-1.6
-1.7
-1.8
-1.9
-2.0
34
33
32
CARRIER SUPPRESSION
-12
-16
-20
-24
+85 ° C
7
8
9
10
11
12
7
8
9
10
11
12
0
200
400
600
800 1000 1200 1400
LO POWER (dBm)
LO POWER (dBm)
I/Q INPUT LEVEL (mV)
_______________________________________________________________________________________
5
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