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Unformatted text preview: Low Power 12.65 mW, 2.3 V to 5.5 V, Programmable Waveform Generator AD9833 Rev. C 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. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.461.3113 ©2003–2010 Analog Devices, Inc. All rights reserved. FEATURES Digitally programmable frequency and phase 12.65 mW power consumption at 3 V 0 MHz to 12.5 MHz output frequency range 28-bit resolution (0.1 Hz @ 25 MHz ref clock) Sinusoidal/triangular/square wave outputs 2.3 V to 5.5 V power supply No external components required 3-wire SPI® interface Extended temperature range: −40°C to +105°C Power-down option 10-lead MSOP package Qualified for automotive applications APPLICATIONS Frequency stimulus/waveform generation Liquid and gas flow measurement Sensory applications—proximity, motion, and defect detection Line loss/attenuation Test and medical equipment Sweep/clock generators TDR GENERAL DESCRIPTION The AD9833 is a low power programmable waveform generator capable of producing sine, triangular, and square wave outputs. Waveform generation is required in various types of sensing, actuation, and time-domain reflectometry applications. The output frequency and phase are software programmable, allowing easy tuning. No external components are needed. The frequency registers are 28 bits, and with a 25 MHz clock rate, resolution of 0.1 Hz can be achieved. Similarly, with a 1 MHz clock rate, the AD9833 can be tuned to 0.004 Hz resolution. The AD9833 is written to via a 3-wire serial interface. This serial interface operates at clock rates up to 40 MHz and is compatible with DSP and microcontroller standards. The device operates with a power supply from 2.3 V to 5.5 V. The AD9833 has a power-down function (SLEEP). This function allows sections of the device that are not being used to be powered down thus minimizing the current consumption of the part, for example, the DAC can be powered down when a clock output is being generated. The AD9833 is available in a 10-lead MSOP package. FUNCTIONAL BLOCK DIAGRAM SERIAL INTERFACE AND CONTROL LOGIC SCLK SDATA FSYNC CONTROL REGISTER PHASE1 REG PHASE0 REG MUX SIN ROM 10-BIT DAC MUX FREQ0 REG FREQ1 REG 12 ON-BOARD REFERENCE AGND DGND VDD AD9833 PHASE ACCUMULATOR (28-BIT) REGULATOR CAP/2.5V 2.5V AVDD/ DVDD MUX DIVIDE BY 2 MSB MUX FULL-SCALE CONTROL COMP VOUT R 200 Ω MCLK 02704-001 Figure 1. AD9833 Rev. C | Page 2 of 24 TABLE OF CONTENTS Features .............................................................................................. 1 Features ....
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