ADRF6801 datasheet(1/36 Pages) AD

Il numero della parte	ADRF6801

Spiegazioni elettronici	750 MHz to 1150 MHz Quadrature Demodulator with Fractional-N PLL and VCO

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750 MHz to 1150 MHz Quadrature

Demodulator with Fractional-N PLL and VCO

ADRF6801

Rev. 0

Information furnished by Analog Devices is believed to be accurate and reliable. However, no

responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringements of patents or other

rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No

license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781.329.4700

www.analog.com

Fax: 781.461.3113

FEATURES

IQ demodulator with integrated fractional-N PLL

LO frequency range: 750 MHz to 1150 MHz

Input P1dB: 12.5 dBm

Input IP3: 25 dBm

Noise figure (DSB): 14.3 dB

Voltage conversion gain: 5.1 dB

Quadrature demodulation accuracy

Phase accuracy: 0.3°

Amplitude accuracy: 0.05 dB

Baseband demodulation: 275 MHz, 3 dB bandwidth

SPI serial interface for PLL programming

40-lead, 6 mm × 6 mm LFCSP

APPLICATIONS

QAM/QPSK RF/IF demodulators

Cellular W-CDMA/CDMA/CDMA2000

Microwave point-to-(multi)point radios

Broadband wireless and WiMAX

GENERAL DESCRIPTION

The ADRF6801 is a high dynamic range IQ demodulator with

integrated PLL and VCO. The fractional-N PLL/synthesizer

generates a frequency in the range of 3.0 GHz to 4.6 GHz. A

divide-by-4 quadrature divider divides the output frequency of

the VCO down to the required local oscillator (LO) frequency

to drive the mixers in quadrature. Additionally, an output buffer

can be enabled that generates an fVCO/2 signal for external use.

The PLL reference input is supported from 10 MHz to 160 MHz.

The phase detector output controls a charge pump whose output

is integrated in an off-chip loop filter. The loop filter output is

then applied to an integrated VCO.

The IQ demodulator mixes the differential RF input with the

complex LO derived from the quadrature divider. The differential

I and Q output paths have excellent quadrature accuracy and

can handle baseband signaling or complex IF up to 120 MHz.

The ADRF6801 is fabricated using an advanced silicon-germanium

BiCMOS process. It is available in a 40-lead, exposed-paddle,

RoHS-compliant, 6 mm × 6 mm LFCSP package. Performance is

specified over the −40°C to +85°C temperature range.

FUNCTIONAL BLOCK DIAGRAM

MUX

RSET

GND

LON

LOP

MUX

TEMP

SENSOR

GND

VCCBB

GND

VCCLO

BUFFER

QBBN

VCCLO

–

+

CHARGE PUMP

250µA,

500µA (DEFAULT),

750µA,

1000µA

PRESCALER

÷2

VCO LDO

2.5V LDO

LE

CLK

SPI

INTERFACE

DATA

MUXOUT

REFIN

ADRF6801

34

GND

LOSEL

35

19

QBBP

18

17

16

DECL1

40

VTUNE

39

DECL2

VCC2

9

10

5

DECL3

2

VCC1

1

8

6

GND 7

14

GND 15

13

12

38

GND 11

37

36

GND

31

IBBN

IBBP

32

33

28

VCCRF

27

RFIN

26

GNDRF

25

GND

24

GND

23

VCCBB

22

GND

21

20

29

30

PHASE

FREQUENCY

DETECTOR

THIRD-ORDER

FRACTIONAL

INTERPOLATOR

FRACTION

REG

MODULUS

INTEGER

REG

N COUNTER

GND

4

CPOUT

3

×2

÷2

÷4

DIVIDER

÷1

OR

÷2

VCO

CORE

BUFFER

CTRL

QUAD

÷2

3.3V LDO

Figure 1.

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