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參數(shù)資料
| 型號(hào)： | AD9831 |
| 廠商： | Analog Devices, Inc. |
| 元件分類： | XO, clock |
| 英文描述： | CMOS Complete DDS |
| 中文描述： | 完整的DDS的CMOS |
| 文件頁數(shù)： | 12/16頁 |
| 文件大?。?/td> | 172K |
| 代理商： | AD9831 |
AD9831
–12–
REV. A
APPLIC AT IONS
T he AD9831 contains functions which make it suitable for
modulation applications. T he part can be used to perform
simple modulation such as FSK . More complex modulation
schemes such as GMSK and QPSK can also be implemented
using the AD9831. In an FSK application, the two frequency
registers of the AD9831 are loaded with different values; one
frequency will represent the space frequency while the other will
represent the mark frequency. T he digital data stream is fed to
the FSELECT pin which will cause the AD9831 to modulate
the carrier frequency between the two values.
T he AD9831 has four phase registers; this enables the part to
perform PSK . With phase shift keying, the carrier frequency is
phase shifted, the phase being altered by an amount which is
related to the bit stream being input to the modulator. T he
presence of four shift registers eases the interaction needed
between the DSP and the AD9831.
T he frequency and phase registers can be written to continu-
ously, if required. T he maximum update rate equals the
frequency of the MCLK . However, if a selected register is
loaded with a new word, there will be a delay of 6 MCLK cycles
before the analog output will change accordingly.
T he AD9831 is also suitable for signal generator applications.
With its low current consumption, the part is suitable for appli-
cations in which it can be used as a local oscillator. In addition,
the part is fully specified for operation with a +3.3 V
±
10%
power supply. T herefore, in portable applications where current
consumption is an important issue, the AD9831 is perfect.
Grounding and Layout
T he printed circuit board that houses the AD9831 should be
designed so that the analog and digital sections are separated
and confined to certain areas of the board. T his facilitates the
use of ground planes which can be separated easily. A mini-
mum etch technique is generally best for ground planes as it
gives the best shielding. Digital and analog ground planes
should only be joined in one place. If the AD9831 is the only
device requiring an AGND to DGND connection, then the
ground planes should be connected at the AGND and DGND
pins of the AD9831. If the AD9831 is in a system where mul-
tiple devices require AGND to DGND connections, the
connection should be made at one point only, a star ground
point that should be established as close as possible to the
AD9831.
Avoid running digital lines under the device as these will couple
noise onto the die. T he analog ground plane should be allowed
to run under the AD9831 to avoid noise coupling. T he power
supply lines to the AD9831 should use as large a track as is
possible to provide low impedance paths and reduce the effects
of glitches on the power supply line. Fast switching signals such
as clocks should be shielded with digital ground to avoid radiat-
ing noise to other sections of the board. Avoid crossover of
digital and analog signals. T races on opposite sides of the board
should run at right angles to each other. T his will reduce the
effects of feedthrough through the board. A microstrip tech-
nique is by far the best but is not always possible with a
double-sided board. In this technique, the component side of
the board is dedicated to ground planes while signals are placed
on the other side.
Good decoupling is important. T he analog and digital supplies
to the AD9831 are independent and separately pinned out to
minimize coupling between analog and digital sections of the
device. All analog and digital supplies should be decoupled to
AGND and DGND respectively with 0.1
μ
F ceramic capacitors
in parallel with 10
μ
F tantalum capacitors. T o achieve the best
from the decoupling capacitors, they should be placed as close
as possible to the device, ideally right up against the device. In
systems where a common supply is used to drive both the
AVDD and DVDD of the AD9831, it is recommended that the
system’s AVDD supply be used. T his supply should have the
recommended analog supply decoupling between the AVDD
pins of the AD9831 and AGND and the recommended digital
supply decoupling capacitors between the DVDD pins and
DGND.
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| AD9831AST | CMOS Complete DDS |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD9831AST | 制造商:Rochester Electronics LLC 功能描述:25 MHZ +5V/+3V, 10-BIT DDS DAC I.C. - Bulk 制造商:Analog Devices 功能描述:10BIT DAC DDS 25 MHZ +5V/+3V 9831 |
| AD9831AST-REEL | 制造商:Analog Devices 功能描述:Direct Digital Synthesizer 25MHz 1-DAC 10-Bit Parallel 48-Pin LQFP T/R 制造商:Rochester Electronics LLC 功能描述:25 MHZ +5V/+3V, 10-BIT DDS DAC I.C. - Tape and Reel |
| AD9831ASTZ | 功能描述:IC DDS 10BIT 25MHZ CMOS 48-LQFP RoHS:是 類別:集成電路 (IC) >> 接口 - 直接數(shù)字合成 (DDS) 系列:- 產(chǎn)品變化通告:Product Discontinuance 27/Oct/2011 標(biāo)準(zhǔn)包裝:2,500 系列:- 分辨率（位）:10 b 主 fclk:25MHz 調(diào)節(jié)字寬（位）:32 b 電源電壓:2.97 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:16-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:16-TSSOP 包裝:帶卷 (TR) |
| AD9831ASTZKL1 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Analog Devices 功能描述: |
| AD9831ASTZ-REEL | 功能描述:IC DDS 10BIT 25MHZ CMOS 48TQFP RoHS:是 類別:集成電路 (IC) >> 接口 - 直接數(shù)字合成 (DDS) 系列:- 產(chǎn)品變化通告:Product Discontinuance 27/Oct/2011 標(biāo)準(zhǔn)包裝:2,500 系列:- 分辨率（位）:10 b 主 fclk:25MHz 調(diào)節(jié)字寬（位）:32 b 電源電壓:2.97 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:16-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:16-TSSOP 包裝:帶卷 (TR) |
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