MAX2821 datasheet(6/23 Pages) MAXIM

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2.4GHz 802.11b Zero-IF Transceivers

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AC ELECTRICAL CHARACTERISTICS—SYNTHESIZER

(MAX2820/MAX2821 EV kit: VCC = +2.7V to +3.6V, fRF and fLO = 2400MHz to 2499MHz, fOSC = 22MHz or 44MHz, SHDNB = VIH,

CSB = VIH, RBIAS = 12k

Ω, ICP = +2mA, BWPLL = 45kHz, registers set to default power-up settings, TA = +25°C, unless otherwise

noted. Typical values are at VCC = +2.7V, fLO = 2437MHz, fOSC = 22MHz, unless otherwise noted.) (Note 11)

AC ELECTRICAL CHARACTERISTICS—SYSTEM TIMING

(MAX2820/MAX2821 EV kit: VCC = +2.7V to +3.6V, fRF and fLO = 2400MHz to 2499MHz, fOSC = 22MHz or 44MHz, SHDNB = VIH,

CSB = VIH, RBIAS = 12k

Ω, ICP = +2mA, BWLOOP = 45kHz, registers set to default power-up settings, TA = +25°C, unless otherwise

noted. Typical values are at VCC = +2.7V, fLO = 2437MHz, fOSC = 22MHz, unless otherwise noted.) (Note 11)

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

FREQUENCY SYNTHESIZER

LO Frequency Range

2400

2499

MHz

R(0) = 0

Reference Frequency

R(0) = 1

MHz

Channel Spacing

MHz

ICP = 0

± 2

Charge-Pump Output Current

ICP = 1

± 1

Charge-Pump Compliance Range

0.4

VCC - 0.4

-11MHz

≤ fOFFSET ≤ 11MHz

-41

-22MHz

≤ fOFFSET < -11MHz,

11MHz < fOFFSET

≤ 22MHz

-75

Reference Spur Level (Note 10)

fOFFSET < -22MHz, fOFFSET > 22MHz

-90

dBc

fOFFSET = 10kHz

-80

Closed-Loop Phase Noise

fOFFSET = 100kHz

-87

dBc/Hz

Closed-Loop Integrated Phase Noise

Noise integrated from 100Hz to 10MHz,

measured at the TX_RF output

2.5

°RMS

Reference Oscillator Input Level

AC-coupled sine wave input

200

300

500

mVP-P

VOLTAGE-CONTROLLED OSCILLATOR

VCO Tuning Voltage Range

0.4

2.3

fLO = 2400MHz

170

VCO Tuning Gain

fLO = 2499MHz

130

MHz/V

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Channel-Switching Time

fLO = 2400MHz

↔ 2499MHz,

fLO settles to

±10kHz (Note 9)

150

200

µs

RX to TX, fLO settles to within

±30kHz, relative to rising edge of TX_ON

RX/TX Turnaround Time

TX to RX, fLO settles to within

±30kHz, relative to rising edge of RX_ON

µs

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