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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
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. (continued on Page 3)
APPLICATIONS
Frequency scanning/radar Network/impedance measurements Incremental frequency stimulus Sensory applications Proximity and motion
FUNCTIONAL BLOCK DIAGRAM
DVDD CAP/2.5V DGND INTERRUPT STANDBY AGND AVDD
REGULATOR VCC 2.5V MCLK SYNC INCREMENT CONTROLLER DATA INCR
AD5932
BUFFER SYNCOUT
BUFFER
MSBOUT
CTRL
24-BIT PIPELINED DDS CORE
FREQUENCY CONTROLLER
/24
10-BIT DAC
VOUT
DATA AND CONTROL
SERIAL INTERFACE
CONTROL REGISTER
ON-BOARD REFERENCE
FULL-SCALE CONTROL
COMP
05416-001
FSYNC
SCLK
SDATA
Figure 1.
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Protected by U.S. patent number 6747583; other patents pending.
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners.
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AD5932 TABLE OF CONTENTS
Features .............................................................................................. 1 Applications....................................................................................... 1 General Description ......................................................................... 1 Functional Block Diagram .............................................................. 1 Revision History ............................................................................... 2 Specifications..................................................................................... 4 Specifications Test Circuit ........................................................... 5 Timing Specifications .................................................................. 6 Master Clock and Timing Diagrams ......................................... 6 Absolute Maximum Ratings............................................................ 8 ESD Caution.................................................................................. 8 Pin Configuration and Function Descriptions............................. 9 Typical Performance Characteristics ........................................... 10 Terminology .................................................................................... 14 Theory of Operation ...................................................................... 15 Frequency Profile........................................................................ 15 Serial Interface ............................................................................ 15 Powering up the AD5932 .......................................................... 15 Programming the AD5932........................................................ 16 Setting Up the Frequency Scan................................................. 17 Activating and Controlling the Scan ....................................... 18 Outputs from the AD5932 ........................................................ 19 Applications.............................................