MAX2821 datasheet(9/23 Pages) MAXIM

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2.4GHz 802.11b Zero-IF Transceivers

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RECEIVER BASEBAND OUTPUT SPECTRUM

FREQUENCY (MHz)

10 15

25 30

-70

-60

-50

-40

-30

-20

-10

-80

050

VRF_GAIN = VIH

RX GAIN = 50dB

fBB = 5MHz

fLO = 2450MHz

FREQUENCY (MHz)

2480

2460

2420

2440

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

2400

2500

TRANSMITTER OUTPUT POWER

vs. FREQUENCY

+25

°C

-40

°C

+85

°C

VIN = 400mVP-P

VTX_GC = 0V

11Mbps CCK

VCC (V)

3.3

3.0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

2.7

3.6

TRANSMITTER OUTPUT POWER

vs. SUPPLY VOLTAGE

+25

°C

-40

°C

+85

°C

VIN = 400mVP-P

VTX_GC = 0V

11Mbps CCK

-90

-80

-70

-60

-50

-40

-30

-20

-10

-33

-11

-22

112233

TRANSMITTER OUTPUT SPECTRUM

FREQUENCY OFFSET FROM CARRIER (MHz)

RBW = 100kHz

VIN = 400mVP-P

11Mbps CCK

POUT = -1dBm

-80

-60

-70

-40

-50

-30

-20

-10

0 0.8 1.6 2.4 3.2 4.0 4.8 5.6 6.4 7.2 8.0

TRANSMITTER OUTPUT SPECTRUM

FREQUENCY (GHz)

CW SIGNAL

fBB = 3.3MHz

fLO = 2450MHz

VTX_GC (V)

1.5

1.0

0.5

-30

-25

-20

-15

-10

-5

-35

02.0

TRANSMITTER GAIN

vs. GAIN-CONTROL VOLTAGE

0dB = MAX POUT AT +25

°C

VIN = 400mVP-P

11Mbps CCK

+25

°C

-40

°C

+85

°C

Typical Operating Characteristics (continued)

(MAX2820/MAX2821 EV kit, VCC = +2.7V, fBB = 1MHz, fLO = 2450MHz, receive baseband outputs = 500mVP-P, transmit base-

band inputs = 400mVP-P, ICP = +2mA, BWPLL = 45kHz, differential RF input/output matched to 50

Ω through a balun, baseband

input biased at +1.2V, registers set to default power-up settings, TA = +25

°C, unless otherwise noted.)

MAX2821 Datasheet(PDF) 9 Page - Maxim Integrated Products

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