MAX2821 datasheet(5/23 Pages) MAXIM

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2.4GHz 802.11b Zero-IF Transceivers

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AC ELECTRICAL CHARACTERISTICS—TRANSMIT MODE (continued)

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

inputs = 400mVP-P, SHDNB = TX_ON = VIH, RX_ON = VIL, CSB = VIH, 0V

≤ VTX_GC ≤ +2.0V, RBIAS = 12kΩ, ICP = +2mA, BWPLL =

45kHz, differential RF output matched to 50

Ω through a balun, baseband input biased at +1.2V, registers set to default power-up set-

tings, TA = +25

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

AC ELECTRICAL CHARACTERISTICS—PA BIAS

(MAX2820/MAX2821 EV kit: VCC = +2.7V to +3.6V, SHDNB = VIH, TX_ON = VIH, CSB = VIH, PA_BIAS enabled, RBIAS = 12k

Ω, regis-

ters set to default power-up settings, TA = +25

°C, unless otherwise noted. Typical values are at VCC = +2.7V, unless otherwise noted.)

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

TA = +25

°C-1

TX RF Output Power

VIN = 400mVP-P at

5.5MHz,

VTX_GC = 0V,

I/Q CW signal (Note 7)

TA = -40°C to

+85°C

-2

dBm

-22MHz

≤ fOFFSET ≤ -11MHz,

11MHz

≤ fOFFSET ≤ 22MHz

-37

TX RF ACPR (Note 8)

-33MHz

≤ fOFFSET < -22MHz,

22MHz < fOFFSET

≤ 33MHz

-59

dBc

Unwanted sideband

-40

LO signal

-30

In-Band Spurious Signals Relative to

Modulated Carrier

fRF = 2400MHz to

2483MHz

Spurs >

±22MHz

-80

dBc

× fLO

-40

TX RF Harmonics

× fLO

-55

dBm

fRF < 2400MHz

-60

fRF = 2500MHz to 3350MHz

-43

TX RF Spurious Signal Emissions

(Outside 2400MHz to 2483.5MHz)

Nonharmonic Signals

fRF > 3350MHz

-45

dBm

TX RF Output Noise

fOFFSET

≥ 22MHz, 0V ≤ VTX_GC ≤ +2.0V

-135

dBm/Hz

TX RF Output Return Loss

With external match

TX BASEBAND FILTER RESPONSE

-3dB Frequency

MHz

At 22MHz

Attenuation Relative to Passband

At 44MHz

TX GAIN-CONTROL CHARACTERISTICS

Gain-Control Range

≤ VTX_GC ≤ +2.0V

Gain-Control Slope

Peak gain slope

dB/V

Gain-Control Response Time

VTX_GC = +2.0V to 0V step

0.3

µs

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Resolution

Bits

Full-Scale Output Current

300

µA

LSB Size

µA

Output Voltage Compliance Range

(Note 11)

1.0

1.2

1.3

Settling Time

Relative to rising edge of CSB, zero to full-

scale step 0000

→ 1111, settle to 1/2 LSB,

2pF load

1µs

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