Datasheet

MAX2831/MAX2832
2.4GHz to 2.5GHz 802.11g/b
RF Transceivers with Integrated PA
8 _______________________________________________________________________________________
AC ELECTRICAL CHARACTERISTICS—Frequency Synthesis
(MAX2831 EV kit: V
CC_
= 2.7V, V
CCPA
= V
CCTXPA
= 3.3V, T
A
= +25°C, f
LO
= 2.437GHz, f
REF
= 40MHz, SHDN = CS = high, SCLK =
DIN = low, PLL loop bandwidth = 150kHz, and T
A
= +25°C, unless otherwise noted.) (Note 1)
PARAMETER CONDITIONS MIN TYP MAX UNITS
FREQUENCY SYNTHESIZER
RF Channel Center Frequency 2.4 2.5 GHz
Channel Center Frequency
Programming Minimum Step Size
20 Hz
Charge-Pump Comparison
Frequency
20 MHz
Reference Frequency Range 20 44 MHz
Reference Frequency Input
Levels
AC-coupled to XTAL pin 800 mV
P-P
Resistance (XTAL) 5 kΩ
Reference Frequency Input
Impedance (R || C)
Capacitance (XTAL) 4 pF
f
OFFSET
= 1kHz -86
f
OFFSET
= 10kHz -94
f
OFFSET
= 100kHz -94
f
OFFSET
= 1MHz -110
Closed-Loop Phase Noise
f
OFFSET
= 10MHz -120
dBc/Hz
Closed-Loop Integrated Phase
Noise
RMS phase jitter; integrate from 10kHz to 10MHz offset 0.9 D eg r ees
Charge-Pump Output Current 1mA
Reference Spurs 20MHz offset -55 dBc
3µs to 9µs 50
VCO Frequency Error
M easur ed fr om Tx- Rx or Rx- Tx
tr ansi ti on
> 9µs 1
kHz
VOLTAGE-CONTROLLED OSCILLATOR
Pushing Referred to 2400MHz LO, V
CC
varies by 0.3V 210 kHz
VCO Tuning Voltage Range 0.5 2.2 V
V
TUNE
= 0.5V 103
LO Tuning Gain
V
TUNE
= 2.2V 86
MHz/V