Programmable Frequency Sweep and

Output Burst Waveform Generator

AD5930

Rev. 0

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FEATURES

Programmable frequency profile

No external components necessary

Output frequency up to 25 MHz

Burst and listen capability

Preprogrammable frequency profile minimizes number of

DSP/µcontroller writes

Sinusoidal/triangular/square wave outputs

Automatic or single pin control of frequency stepping

Waveform starts at known phase

Increments at 0° phase or phase continuously

Power-down mode: 20 µA

Power supply: 2.3 V to 5.5 V

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

20-lead pb-free TSSOP

APPLICATIONS

Frequency sweeping/radar

Network/impedance measurements

Incremental frequency stimulus

Sensory applications

Proximity and motion

BFSK

Frequency bursting/pulse trains

GENERAL DESCRIPTION

The AD59301 is a waveform generator with programmable

frequency sweep and output burst capability. 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

and thereby free up valuable DSP/µcontroller resources.

Waveforms start from a known phase and are incremented

phase continuously, which allows phase shifts to be easily

determined. Consuming only 8 mA, the AD5930 provides a

convenient low power solution to waveform generation.

The AD5930 can be operated in a variety of modes. In

continuous output mode, the device outputs the required

frequency for a defined length of time and then steps to the

next frequency. The length of time the device outputs a

particular frequency is either preprogrammed and the device

increments the frequency automatically, or, alternatively, is

incremented externally via the CTRL pin. In burst mode, the

device outputs its frequency for a length of time and then

returns to midscale for a further predefined length of time

before stepping to the next frequency. When the MSBOUT pin

is enabled, a digital output is generated.

(continued on Page 3)

FUNCTIONAL BLOCK DIAGRAM

CONTROL

REGISTER

DATA

24

INCR

SYNC

AND CONTROL

SYNCOUT

DGND O/P

MSBOUT

IOUTB

IOUT

COMP

MCLK

CTRL

INCREMENT

CONTROLLER

FREQUENCY

CONTROLLER

SERIAL INTERFACE

OUTPUT BURST

CONTROLLER

INTERRUPT

AD5930

STANDBY

DGND

AGND AVDD

REF

FSADJUST

24-BIT

PIPELINED

DDS CORE

DATA

DATA

SYNC

BUFFER

BUFFER

10-BIT

DAC

FSYNC SCLK

SDATA

FULL-SCALE

CONTROL

ON-BOARD

REFERENCE

REGULATOR

VCC

2.5V

Figure 1.