ADF4159CCPZ-RL7 View Datasheet(PDF) - Analog Devices

Part Name

Description

Manufacturer

ADF4159CCPZ-RL7

Direct Modulation/Fast Waveform Generating, 13 GHz, Fractional-N Frequency Synthesizer

Analog Devices 

ADF4159

Data Sheet

APPLICATION OF THE ADF4159 IN FMCW RADAR

Figure 54 shows the application of the ADF4159 in a frequency

modulated continuous wave (FMCW) radar system. In the FMCW

radar system, the ADF4159 is used to generate the sawtooth or

triangle ramps that are necessary for this type of radar to operate.

Traditionally, the PLL was driven directly by a direct digital

synthesizer (DDS) to generate the required type of waveform. Due

to the waveform generating mechanism that is implemented on

the ADF4159, a DDS is no longer needed, which reduces cost.

The PLL solution also has advantages over another method for

generating FMCW ramps: a DAC driving the VCO directly; this

method suffers from nonlinearities of the VCO tuning character-

istics, requiring compensation. The PLL method produces highly

linear ramps without the need for calibration.

NO DDS REQUIRED

WITH ADF4159

REFERENCE

OSCILLATOR

LINEAR

FREQUENCY

SWEEP

ADF4159

VCO

×2

PA

MULT ×2

Tx

ANTENNA

AD8283

MICRO-

CONTROLLER

DSP

16 BITS

10 BITS TO

12 BITS

ADSP-BF531

ADC

BASEBAND

HPF

RANGE

COMPENSATION

MIXER

Rx

ANTENNAS

MUX

: ..

BUS

CAN/FLEXRAY

FREQUENCY MODULATED CONTINUOUS WAVE

LONG RANGE RADAR

Figure 54. FMCW Radar with the ADF4159

Rev. B | Page 34 of 36

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