HFA3726IN 데이터 시트보기 (PDF) - Intersil

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HFA3726IN

400MHz Quadrature IF Modulator/Demodulator

Intersil 

HFA3726

Typical Application Diagram (Targeting IEEE 802.11 Standard)

TOYOCOM

TQS 432

VCC

0.1 75

(NOTE 21)

(NOTE 20)

100p 2

3

PE

74

77

76

100p

560

0.1

VCC

0.1

55

PE

54

57 100p

62

63

56 1K

VCC

0.1

0.1 VCC

RSSI

45

48

49

47

33 0.01 30

34

29

9

RXI_OUT

14

0.01

0.1

14

80

100p 61 64

60 100p

47p

79

100p

47p

100p

59

0.01

35 0.01 28

36

27

RXQ_OUT

15

0.01

20

TOYOCOM

TQS 432

VCO

LO_IN

(NOTE 22)

47p 220 44

56

VCC

46

0.1

47nH

316

TX_IF_OUT

42

100p (NOTE 23)

560MHz

VCO (AUXILIARY)

NC

50

43

0.01

18

900

19

(NOTE 24)

37 0.01 26

38

25

0.01

39 0.01 24

40

23

0.01

41

22

10

2V REF

0.1

12

TXI

0.1

11

TXQ

13

21

DUAL SYNTHESIZER

HFA3524IA

NOTES:

20. Input termination used to match a SAW filter.

21. Typical bandpass filter for 280MHz, BW = 47MHz, Q = 6. Can also be used if desired after the second stage.

22. Network shown for a typical -10dBm input at 50Ω.

23. Output termination used to match a SAW filter.

24. RTUNE value for a 7.7 MHz cutoff frequency setting.

FIGURE 23. TYPICAL APPLICATION DIAGRAM (TARGETING IEEE 802.11 STANDARD)

Overall Device Description

The HFA3726 is a highly integrated baseband converter for half

duplex wireless data applications. It features all the necessary

blocks for baseband modulation and demodulation of “I” and

“Q” quadrature multiplexing signals. It targets applications using

all phase shift types of modulation (PSK) due to its hard limiting

receiving front end. Four fully independent blocks adds flexibility

for numerous applications covering a wide range of IF

frequencies. A differential design architecture, device pin out

and layout have been chosen to improve system RF properties

such as common mode signal immunity (noise, crosstalk),

reduce relevant parasitics, settling times and optimize dynamic

range for low power requirements. Single power supply

requirements from 2.7VDC to 5.5VDC makes the HFA3726 a

good choice for portable transceiver designs.

The HFA3726 has a two stage integrated limiting IF amplifier

with frequency response to 400MHz. These amplifiers

exhibit a -84dBm, -3dB cascaded limiting sensitivity with a

built in Receive Signal Strength Indicator (RSSI) covering

60dB of dynamic range with excellent linearity. An up

conversion and down conversion pair of quadrature doubly

balanced mixers are available for “I” and “Q” baseband IF

processing. These converters are driven by an internal

quadrature LO generator which has a broadband response

with excellent quadrature properties. To achieve broadband

operation, the Local Oscillator frequency input is required to

be twice the desired frequency for modulation/demodulation.

Duty cycle and signal purity requirements for the 2X LO input

using this type of quadrature architecture are less restrictive

14

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