AD9852ASQZ datasheet(16/52 Pages) AD

16 / 52 page

AD9852

Rev. E | Page 16 of 52

TYPICAL APPLICATIONS

RF/IF

INPUT

BASEBAND

REFCLK

COS

AD9852

LOW-PASS

FILTER

Figure 25. Synthesized LO Application for the AD9852

RF IN

DUAL

8-/10-BIT

ADC

DIGITAL

DEMODULATOR

Rx BASEBAND

DIGITAL

DATA OUT

I/Q MIXER

AND

LOW-PASS

FILTER

VCA

ADC ENCODE

ADC CLOCK FREQUENCY

LOCKED TO Tx CHIP/

SYMBOL/PN RATE

REFERENCE

CLOCK

CHIP/SYMBOL/PN

RATE DATA

AD9852

CLOCK

GENERATOR

AGC

Figure 26. Chip Rate Generator in Spread Spectrum Application

BAND-PASS

FILTER

IOUT

AD9852

FUNDAMENTAL

FC – FO

IMAGE

FCLK

FC + FO

IMAGE

BAND-PASS

FILTER

FC + FO

IMAGE

AD9852

SPECTRUM

FINAL OUTPUT

SPECTRUM

AMPLIFIER

Figure 27. Using an Aliased Image to Generate a High Frequency

LOOP

FILTER

PHASE

COMPARATOR

REFERENCE

CLOCK

FILTER

AD9852

DDS

TUNING

WORD

REFCLK IN

RF FREQUENCY

OUT

DAC OUT

PROGRAMMABLE

DIVIDE-BY-N FUNCTION

(WHERE N = 248/TUNING WORD)

VCO

Figure 28. Programmable Fractional Divide-by-N Synthesizer

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