ADF5901 datasheet(26/27 Pages) AD

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Data Sheet

ADF5901

Rev. A | Page 25 of 26

APPLICATIONS INFORMATION

APPLICATION OF THE ADF5901 IN FMCW RADAR

Figure 31 shows the application of the ADF5901 in a frequency

modulated continuous wave (FMCW) radar system.

In the FMCW radar system, the ADF4159 generates the

sawtooth or triangle ramps necessary for this type of radar to

operate.

The ADF4159 controls the VTUNE pin on the ADF5901 (Tx)

MMIC and thus the frequency of the VCO and the Tx output

signal on TXOUT1 or TXOUT2. The LO signal from the ADF5901

is fed to the LO input on the ADF5904.

The ADF5904 downconverts the signal from the four receiver

antennas to baseband with the LO signal from the Tx MMIC.

The downconverted baseband signals from the four receiver

channels on the ADF5904 are fed to the ADAR7251 4-channel,

continuous time, Σ-Δ analog-to-digital converter (ADC).

A digital signal processor (DSP) follows the ADC to handle the

target information processing.

Figure 31. FMCW Radar with ADF5901

ADF5901

ADF5904

ADF4159

TXOUT1

TXOUT2

RX3_RF

RX2_RF

RX1_RF

RX4_RF

LO_IN

LOOUT

RFINA

RFINB

AUX

ADAR7251

DSP

RX BASEBAND

VTUNE

LOOP

FILTER

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