MAX2821ETM-TD datasheet(10/26 Pages) MAXIM

Part #	MAX2821ETM-TD

Description	2.4GHz 802.11b Zero-IF Transceivers

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Manufacturer	MAXIM [Maxim Integrated Products]

Direct Link	https://www.maximintegrated.com/en.html

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10 / 26 page

2.4GHz 802.11b Zero-IF Transceivers

10

______________________________________________________________________________________

-50

-60

-70

-80

-90

-100

-110

-120

-130

100

10k

100k

1k

1M

CLOSED-LOOP PHASE NOISE

vs. OFFSET FREQUENCY

OFFSET FREQUENCY (Hz)

fLO = 2450MHz

BWLOOP = 45kHz

ICP = 2mA

φINT = 2.1°RMS

MAX2820/MAX2821

("A" VERSION)

MAX2820/MAX2821

VCO/PLL SETTING TIME

TIME (

µs)

-40

-30

-20

-10

0

10

20

30

40

50

-50

360

320

240 280

80 120 160 200

40

0400

BWLOOP = 45kHz

fLO = 2499MHz TO 2400MHz

Typical Operating Characteristics (continued)

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

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.)

TRANSMITTER BASEBAND FILTER RESPONSE

FREQUENCY (MHz)

90

80

70

60

50

40

30

20

10

-50

-40

-30

-20

-10

0

10

-60

0100

fLO = 2450MHz

LO FREQUENCY vs. TUNING VOLTAGE

VTUNE (V)

2.0

1.5

1.0

0.5

2.25

2.30

2.35

2.40

2.45

2.50

2.55

2.60

2.65

2.20

02.5

+25

°C

+85

°C

-40

°C

-50

-140

1

1000

100

10

OPEN-LOOP PHASE NOISE

vs. OFFSET FREQUENCY

-110

-130

-70

-90

-40

-100

-120

-60

-80

OFFSET FREQUENCY (kHz)

fLO = 2450MHz

MEASURED AT

TX OUTPUT

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