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AD9834BRUZ Datasheet(PDF) 1 Page - Analog Devices |
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AD9834BRUZ Datasheet(HTML) 1 Page - Analog Devices |
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1 / 36 page  20 mW Power, 2.3 V to 5.5 V, 75 MHz Complete DDS AD9834 Rev. C Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringements of patents or other rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners. 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 ©2003–2011 Analog Devices, Inc. All rights reserved. FEATURES Narrow-band SFDR >72 dB 2.3 V to 5.5 V power supply Output frequency up to 37.5 MHz Sine output/triangular output On-board comparator 3-wire SPI® interface Extended temperature range: −40°C to +105°C Power-down option 20 mW power consumption at 3 V 20-lead TSSOP APPLICATIONS Frequency stimulus/waveform generation Frequency phase tuning and modulation Low power RF/communications systems Liquid and gas flow measurement Sensory applications: proximity, motion, and defect detection Test and medical equipment GENERAL DESCRIPTION The AD9834 is a 75 MHz low power DDS device capable of producing high performance sine and triangular outputs. It also has an on-board comparator that allows a square wave to be produced for clock generation. Consuming only 20 mW of power at 3 V makes the AD9834 an ideal candidate for power-sensitive applications. Capability for phase modulation and frequency modulation is provided. The frequency registers are 28 bits; with a 75 MHz clock rate, resolution of 0.28 Hz can be achieved. Similarly, with a 1 MHz clock rate, the AD9834 can be tuned to 0.004 Hz resolution. Frequency and phase modulation are affected by loading registers through the serial interface and toggling the registers using software or the FSELECT pin and PSELECT pin, respectively. The AD9834 is written to using 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 analog and digital sections are independent and can be run from different power supplies, for example, AVDD can equal 5 V with DVDD equal to 3 V. The AD9834 has a power-down pin (SLEEP) that allows external control of the power-down mode. Sections of the device that are not being used can be powered down to minimize the current consumption. For example, the DAC can be powered down when a clock output is being generated. The part is available in a 20-lead TSSOP. FUNCTIONAL BLOCK DIAGRAM 12 Σ MUX MUX COMPARATOR MSB CAP/2.5V DVDD AGND AVDD MCLK AD9834 FSYNC SCLK SDATA COMP IOUT IOUTB DGND REGULATOR REFOUT FS ADJUST VIN FSELECT 12-BIT PHASE0 REG 12-BIT PHASE1 REG SLEEP RESET PSELECT MUX MUX MUX SIGN BIT OUT VCC 2.5V ON-BOARD REFERENCE 16-BIT CONTROL REGISTER FULL-SCALE CONTROL 10-BIT DAC DIVIDED BY 2 SIN ROM PHASE ACCUMULATOR (28-BIT) 28-BIT FREQ0 REG 28-BIT FREQ1 REG SERIAL INTERFACE AND CONTROL LOGIC Figure 1. |
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