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Wideband I/Q Modulator with Sigma-Delta
Fractional-N Synthesizer
AC ELECTRICAL CHARACTERISTICS
(MAX2150 EV kit. V CC = +2.7V to +3.6V, SHDN = PLLEN = TXEN = high, BUFEN =low. Input I/Q signals: F I/Q = 500kHz, V I/Q = 1V P-P .
I+, Q+ single-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, typical values are at V CC = +3V, T A = +25°C, unless other-
wise noted.) (Note 1)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
MODULATION INPUT
I/Q Input Bandwidth
I/Q Differential Input Level
I/Q DC Input Resistance
BW (-1dB)
BW (-3dB)
Assumes a sine-wave input to achieve the RFOUT output
power specified below
26
75
1
200
MHz
V P-P
k Ω
I/Q Common-Mode Input Range
(Note 2)
1.5
1.6
1.7
V
RF OUTPUT
Frequency Range
700
2300
MHz
Output Power
Output 1dB Compression Point
Output IP3
Carrier Suppression
Sideband Suppression
TXEN = high, f RF = 1750MHz
TXEN = low, f RF = 1750MHz
f RF = 1750MHz
f LO - f I/Q , f RF = 1750MHz
-7
25
-1
-60
1
14
34
34
dBm
dBm
dBm
dBc
dBc
RF Output Noise Floor
Output Return Loss
f OFFSET > 40MHz (Note 2)
(Note 3)
-148
-9
-143
dBm/Hz
dB
LO INPUT/OUTPUT
Frequency Range
700
2300
MHz
LO Input Power
LO Input Return Loss
LO Buffer Output Level
(Note 2)
f LO =2000MHz
BUFEN = high (Note 2)
-12
-14
-10
-15
-9.5
-7
dBm
dB
dBm
SIGMA-DELTA FRACTIONAL-N SYNTHESIZER
SYSTEM REQUIREMENTS
Frequency Range
Phase-Detector Input-Referred
Phase Noise Floor
In-Loop Spurious Emissions
(Note 2)
f COMP = f REF = 20MHz, CP0 = CP1 = CPX = 1 (Note 4)
f LO = 1740.005MHz, f COMP = f REF = 20MHz, CP0 = CP1
= CPX = 1 (Note 5)
700
-138
-40
2300
MHz
dBc/Hz
dBc
MAIN DIVIDER AND PHASE DETECTOR
Minimum Fractional-N Step Size
f COMP /
2 28
Phase-Detector Comparison
Frequency
Maximum N Division
Minimum N Division
20
251
35
30
MHz
_______________________________________________________________________________________
3
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