MAX2821AETM+TD datasheet(3/26 Pages) MAXIM

Part #	MAX2821AETM+TD

Description	2.4GHz 802.11b Zero-IF Transceivers

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Manufacturer	MAXIM [Maxim Integrated Products]

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2.4GHz 802.11b Zero-IF Transceivers

_______________________________________________________________________________________

3

DC ELECTRICAL CHARACTERISTICS (continued)

(MAX2820/MAX2821 EV kit: VCC = +2.7V to +3.6V, RF_GAIN = VIH, 0V

≤ VTX_GC ≤ +2.0V, 0V ≤ VRX_AGC ≤ +2.0V, RBIAS = 12kΩ, no

input signals at RF and baseband inputs, all RF inputs and outputs terminated into 50

Ω, receiver baseband outputs are open, trans-

mitter baseband inputs biased at +1.2V, registers set to default power-up settings, TA = -40

°C to +85°C, unless otherwise noted.

Typical values are at VCC = +2.7V, TA = +25

°C, unless otherwise noted.) (Note 1)

AC ELECTRICAL CHARACTERISTICS—RECEIVE MODE

(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)

PARAMETERS

CONDITIONS

MIN

TYP

MAX

UNITS

TX BASEBAND I/O

TX BB Input Common-Mode

Range

1.0

1.2

1.4

V

TX BBI and BBQ Input Bias

Current

-10

µA

TX BB Input Impedance

Differential resistance

100

k

Ω

TX_GC Input Bias Current

0V

≤ VTX_GC ≤ +2.0V

10

µA

TX_GC Input Impedance

Resistance

250

k

Ω

REFERENCE OSCILLATOR INPUT

Reference Oscillator Input

Impedance

20

k

Ω

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

RECEIVER CASCADE PERFORMANCE (RF INPUT TO BASEBAND OUTPUT)

RF Frequency Range

2400

2499

MHz

LO Frequency Range

2400

2499

MHz

TA = +25°C

97

105

RF_GAIN = VIH,

VRX_AGC = 0V

TA = -40

°C to +85°C95

RF_GAIN = VIH,

VRX_AGC = +2.0V

TA = +25

°C33

RF_GAIN = VIL,

VRX_AGC = 0V

TA = +25

°C75

Voltage Gain (Note 2)

RF_GAIN = VIL,

VRX_AGC = +2.0V

TA = +25

°C2

dB

RF Gain Step

From RF_GAIN = VIH to RF_GAIN =VIL

30

dB

RF_GAIN = VIH, RX gain

≥ 80dB

3.5

RF_GAIN = VIH, RX gain = 50dB

4.5

DSB Noise Figure (Note 3)

RF_GAIN = VIL, RX gain = 50dB

34

dB

Adjacent Channel Rejection

RX gain = 70dB (Note 4)

49

dB

RF_GAIN = VIH, RX gain = 80dB

-14

Input Third-Order Intercept Point (Note 5)

RF_GAIN = VIL, RX gain = 50dB

18

dBm

RF_GAIN = VIH, RX gain = 80dB

22

Input Second-Order Intercept Point (Note 6)

RF_GAIN = VIL, RX gain = 50dB

60

dBm

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MAX2821AETM+TD Datasheet(PDF) 3 Page - Maxim Integrated Products

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