MAX2821 datasheet(4/23 Pages) MAXIM

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2.4GHz 802.11b Zero-IF Transceivers

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AC ELECTRICAL CHARACTERISTICS—RECEIVE MODE (continued)

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

outputs = 500mVP-P, SHDNB = RX_ON = VIH, TX_ON = VIL, CSB = VIH, SCLK = DIN = VIL, RF_GAIN = VIH, 0V

≤ VRX_AGC ≤ +2.0V,

RBIAS = 12k

Ω, ICP = +2mA, BWPLL = 45kHz, differential RF input matched to 50Ω, 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 1)

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

LO Leakage

-65

dBm

Input Return Loss

With external match

RECEIVER BASEBAND

BASEBAND FILTER RESPONSE

-3dB Frequency

Default bandwidth setting BW (2:0) = (010)

MHz

At 12.5MHz

At 16MHz

At 20MHz

Attenuation Relative to Passband

At 25MHz

BASEBAND OUTPUT CHARACTERISTICS

RX I/Q Gain Imbalance

-1

RX I/Q Phase Quadrature Imbalance

-5

Degrees

RX I/Q Output 1dB Compression

Differential voltage into 5k

Ω

1VP-P

RX I/Q Output THD

VOUT = 500mVP-P at 5.5MHz, ZL = 5k

Ω||5pF

-35

dBc

BASEBAND AGC AMPLIFIER

AGC Range

VRX_AGC = 0 to +2.0V

AGC Slope

Peak gain slope

dB/V

AGC Response Time

20dB gain step, 80dB to 60dB,

settling to

±1dB

2µs

BASEBAND RX PEAK LEVEL DETECTION

RF_GAIN = VIH,

RX_DET = VOL to VOH

-49

RX Detector Trip Point (at RX_RF)

CW signal

RF_GAIN = VIL,

RX_DET = VOH to VOL

-54

dBm

RX Detector Hysteresis

5dB

RX Detector Rise Time

With 3dB overdrive

µs

AC ELECTRICAL CHARACTERISTICS—TRANSMIT MODE

(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.)

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

TRANSMIT SIGNAL PATH: BASEBAND INPUT TO RF OUTPUT

RF Output Frequency Range

2400

2499

MHz

LO Output Frequency Range

2400

2499

MHz

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