AD5930_15 Datasheet, PDF (1/28 Pages) Analog Devices – Programmable Frequency Sweep and Output Burst Waveform Generator

Data Sheet
Programmable Frequency Sweep and
Output Burst Waveform Generator
AD5930
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
INTERRUPT STANDBY
DVDD CAP/2.5V DGND AGND AVDD
MCLK
CTRL
AD5930
REGULATOR
OUTPUT BURST
CONTROLLER
VCC
2.5V
SYNC
BUFFER
DATA
SYNC
INCREMENT
CONTROLLER
DATA
INCR
FREQUENCY
CONTROLLER
24
24-BIT
PIPELINED
DDS CORE
DATA AND CONTROL
SERIAL INTERFACE
CONTROL
REGISTER
ON-BOARD
REFERENCE
BUFFER
10-BIT
DAC
FULL-SCALE
CONTROL
FSYNC SCLK SDATA
Figure 1.
REF FSADJUST
SYNCOUT
DGND O/P
MSBOUT
IOUTB
IOUT
COMP
1 _{Protected by US Patent Number 6747583.}
Rev. B
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