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| 型号： | EVAL-AD9838SDZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 1/32页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR AD9838 |
| 产品培训模块： | Direct Digital Synthesis Tutorial Series (1 of 7): Introduction Direct Digital Synthesizer Tutorial Series (7 of 7): DDS in Action Direct Digital Synthesis Tutorial Series (3 of 7): Angle to Amplitude Converter Direct Digital Synthesis Tutorial Series (6 of 7): SINC Envelope Correction Direct Digital Synthesis Tutorial Series (4 of 7): Digital-to-Analog Converter Direct Digital Synthesis Tutorial Series (2 of 7): The Accumulator |
| 标准包装： | 1 |
| 主要目的： | 计时，直接数字合成（DDS） |
| 嵌入式： | 否 |
| 已用 IC / 零件： | AD9838 |
| 主要属性： | USB 供电或外部电源 |
| 次要属性： | SPI 接口 |
| 已供物品： | 板，线缆，CD，文档 |
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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
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
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
09
07
7-
00
1
Figure 1.
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