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Wideband I/Q Modulator with Sigma-Delta
Fractional-N Synthesizer
AC ELECTRICAL CHARACTERISTICS (continued)
(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
REFERENCE OSCILLATOR AND DIVIDER
Input Frequency Range
10
50
MHz
AC-Coupled Input Sensitivity
Reference Division Ratio
AC-coupled, single ended (Note 2)
(Notes 2, 6)
0.4
1
2.3
4
V P-P
CHARGE-PUMP OUTPUT
CP1, CP0 = 00
CPX = 0
CPX = 1
0.12
0.23
0.17
0.34
0.22
0.44
Charge-Pump Current (Note 7)
Charge-Pump Voltage
Compliance
CP1, CP0 = 01
CP1, CP0 = 10
CP1, CP0 = 11
Sink/source currents match within ±5%
CPX = 0
CPX = 1
CPX = 0
CPX = 1
CPX = 0
CPX = 1
0.23
0.47
0.36
0.70
0.48
0.91
0.5
0.35
0.67
0.52
1.00
0.69
1.31
0.46
0.88
0.68
1.30
0.90
1.70
V CC -
0.5
mA
V
Note 1: Parameters are guaranteed by production testing at +25 ° C and +85 ° C. Minimum and maximum values over the tempera-
ture and supply voltage range are guaranteed by design and characterization.
Note 2: Guaranteed by design and characterization.
Note 3: Measured with MAX2150 EV kit.
Note 4: Measured with an on-chip crystal oscillator.
Note 5: In-loop spurious emissions occur when synthesizing a frequency at an integer multiple of the comparison frequency with
fractional offset within the PLL loop BW.
Note 6: If an on-chip oscillator is used, a fundamental tone crystal is needed.
Note 7: Minimum and maximum values at CPX = 1 are guaranteed by production testing. Values at CPX = 0 are guaranteed by
design and characterization.
4
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