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AD9838 Datasheet(PDF) 1 Page - Analog Devices |
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AD9838 Datasheet(HTML) 1 Page - Analog Devices |
1 / 32 page 11 mW Power, 2.3 V to 5.5 V, Complete DDS AD9838 Rev. A 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 ©2011 Analog Devices, Inc. All rights reserved. FEATURES 2.3 V to 5.5 V power supply MCLK speed: 16 MHz (B grade), 5 MHz (A grade) Output frequency up to 8 MHz Sinusoidal and triangular outputs On-board comparator 3-wire SPI interface Extended temperature range: −40°C to +125°C Power-down option 11 mW power consumption at 2.3 V 20-lead LFCSP 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 AD9838 is a 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 11 mW of power at 2.3 V, the AD9838 is an ideal candidate for power-sensitive applications. Capability for phase modulation and frequency modulation is provided. The frequency registers are 28 bits wide: with a 16 MHz clock rate, resolution of 0.06 Hz can be achieved; with a 5 MHz clock rate, the AD9838 can be tuned to 0.02 Hz resolution. Frequency and phase modulation are configured by loading registers through the serial interface and by toggling the registers using software or the FSELECT and PSELECT pins, respectively. The AD9838 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 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 AD9838 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 current con- sumption. For example, the DAC can be powered down when a clock output is being generated. The AD9838 is available in a 20-lead LFCSP_WQ package. FUNCTIONAL BLOCK DIAGRAM 12 Σ MUX MUX COMPARATOR MSB CAP/2.5V DVDD AGND AVDD MCLK AD9838 FSYNC SCLK SDATA COMP IOUT IOUTB DGND REGULATOR REFOUT FSADJUST 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 DIVIDE 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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