Programmable Frequency Scan

Waveform Generator

AD5932

Rev. 0

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FEATURES

GENERAL DESCRIPTION

Programmable frequency profile

The AD59321 is a waveform generator offering a programmable

frequency scan. Utilizing embedded digital processing that

allows enhanced frequency control, the device generates

synthesized analog or digital frequency-stepped waveforms.

Because frequency profiles are preprogrammed, continuous

write cycles are eliminated, thereby freeing up valuable

DSP/microcontroller resources. Waveforms start from a known

phase and are incremented phase-continuously, which allows

phase shifts to be easily determined. Consuming only 6.7 mA,

the AD5932 provides a convenient low power solution to

waveform generation.

No external components necessary

Output frequency up to 25 MHz

Burst-and-listen capability

Preprogrammable frequency profile minimizes number of

DSP/microcontroller writes

Sinusoidal/triangular/square wave outputs

Automatic or single pin control of frequency stepping

Power-down mode: 20 μA

Power supply: 2.3 V to 5.5 V

Automotive temperature range: −40°C to +125°C

16-lead, Pb-free TSSOP

The AD5932 outputs each frequency in the range of interest for

a defined length of time and then steps to the next frequency in

the scan range. The length of time the device outputs a particular

frequency is preprogrammed, and the device increments the

frequency automatically; or, alternatively, the frequency is

incremented externally via the CTRL pin. At the end of the

range, the AD5932 continues to output the last frequency until

the device is reset. The AD5932 also offers a digital output via

the MSBOUT pin.

APPLICATIONS

Frequency scanning/radar

Network/impedance measurements

Incremental frequency stimulus

Sensory applications

Proximity and motion

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FUNCTIONAL BLOCK DIAGRAM

AD5932

DVDD

CAP/2.5V

DGND

INTERRUPT

STANDBY

AGND

AVDD

VCC

2.5V

SYNC

MCLK

CTRL

FSYNC

SYNCOUT

MSBOUT

VOUT

COMP

SCLK

SDATA

DATA AND CONTROL

FREQUENCY

CONTROLLER

INCREMENT

CONTROLLER

CONTROL

REGISTER

ON-BOARD

REFERENCE

FULL-SCALE

CONTROL

24-BIT

PIPELINED

DDS CORE

10-BIT

DAC

SERIAL INTERFACE

REGULATOR

DATA

INCR

BUFFER

BUFFER

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24

Figure 1.