AD5932_15 Datasheet, PDF (1/28 Pages) Analog Devices – Programmable Frequency Scan Waveform Generator

Data Sheet
Programmable Frequency Scan
Waveform Generator
AD5932
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/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
APPLICATIONS
Frequency scanning/radar
Network/impedance measurements
Incremental frequency stimulus
Sensory applications
Proximity and motion
GENERAL DESCRIPTION
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.
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.
DVDD CAP/2.5V
FUNCTIONAL BLOCK DIAGRAM
DGND
INTERRUPT
STANDBY
AGND AVDD
(continued on Page 3)
MCLK
CTRL
REGULATOR
VCC
2.5V
SYNC
INCREMENT
CONTROLLER
DATA
INCR
FREQUENCY
CONTROLLER
/
24
DATA AND CONTROL
AD5932
24-BIT
PIPELINED
DDS CORE
BUFFER
BUFFER
10-BIT
DAC
SYNCOUT
MSBOUT
VOUT
SERIAL INTERFACE
CONTROL
REGISTER
ON-BOARD
REFERENCE
FULL-SCALE
CONTROL
COMP
FSYNC
SCLK
SDATA
Figure 1.
1 _{Protected by U.S. patent number 6747583.}
Rev. A
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