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2.3GHz to 2.7GHz Wireless
Broadband RF Transceiver
AC ELECTRICAL CHARACTERISTICS—FREQUENCY SYNTHESIS
(MAX2837 evaluation kit: V CC_ = 2.8V, f LO = 2.5GHz, f REF = 40MHz, ENABLE = CS = high, SCLK = DIN = low, PLL loop bandwidth =
120kHz, T A = +25°C, unless otherwise noted.) (Note 1)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
FREQUENCY SYNTHESIZER
RF Channel Center Frequency
Channel Center Frequency
Programming Minimum Step Size
Charge-Pump Comparison
Frequency
2.3
11
20
40
2.7
GHz
Hz
MHz
Reference Frequency Range
11
40
80
MHz
Reference Frequency Input
Levels
Reference Frequency Input
Impedance (R || C)
AC-coupled to XTAL2 pin
Resistance (XTAL2 pin)
Capacitance (XTAL2 pin)
800
10
1
mV P-P
k
pF
Programmable Reference Divider
Values
Closed-Loop Integrated Phase
Noise
Charge-Pump Output Current
Close-In Spur Level
Reference Spur Level
Loop BW = 120kHz; integrate phase noise from 200Hz
to 5MHz, charge-pump comparison frequency = 40MHz
On each differential side
f OFFSET = 0 to 1.8MHz
f OFFSET = 1.8MHz to 7MHz
f OFFSET > 7MHz
1
2
-39
1.6
-40
-70
-80
-85
4
dBc
mA
dBc
dBc
Relative to steady state; measured 35 μs after Tx-Rx or
Turnaround LO Frequency Error
Rx-Tx switching instant, and 4μs after any receiver
±50
Hz
gain changes
Temperature Range over Which
VCO Maintains Lock
Reference Output Clock Divider
Values
Output Clock Drive Level
Output Clock Minimum Load
Impedance (R || C)
Relative to the ambient temperature T A , as long as the
VCO lock temperature range is within operating
temperature range
20MHz output, 1x drive setting
Resistance
Capacitance
1
T A ±40
1.5
10
2
2
° C
V P-P
k
pF
_______________________________________________________________________________________
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