2.4GHz 802.11b Zero-IF Transceivers

22

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Typical Application Circuit

VCC_DRVR

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

48

47

46

45

44

43

42

41

40

39

38

37

36

35

34

33

32

31

30

29

28

27

26

25

VCC_LNA

VREF

(MAX2821 ONLY)

RF_GAIN

RX_RFN

RX_RFP

VCC_REF

RBIAS

TX_RFP

TX_RFN

PA_BIAS

TX_GC

SHDNB

VCC_RXF

VCC_LO

VCC_VCO

BYP

TUNE

GND_VCO

GND_CP

CP_OUT

VCC_CP

CSB

SCLK

LOOP FILTER

MAX2820/

MAX2821

PROGRAMMING AND

MODE CONTROL

RX LEVEL

DETECTOR

90

0

90

0

∑

INTEGER-N

SYNTHESIZER

SERIAL

INTERFACE

VOS COMP

DIGITAL MODE CONTROL SIGNALS

FROM/TO BASEBAND IC

TX ANALOG INPUT SIGNAL

FROM BASEBAND IC

REFERENCE

OSCILLATOR INPUT

RX ANALOG OUTPUT SIGNAL

TO BASEBAND IC

DIGITAL MODE CONTROL

SIGNALS TO/FROM BASEBAND IC

RX GAIN-CONTROL SIGNALS

TO/FROM BASEBAND IC

RX RF INPUT FROM

SWITCH AND BPF

TX RF OUTPUT TO

SWITCH AND BPF

SERIAL INTERFACE

TO BASEBAND IC

DAC OUTPUT

FROM BASEBAND IC

TO PA BIAS INPUT

DAC OUTPUT

FROM BASEBAND IC

OPTIONAL CONNECTION

TO BASEBAND