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參數(shù)資料
| 型號： | AD9830AST |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 數(shù)字信號處理外設(shè) |
| 英文描述： | CMOS Complete DDS |
| 中文描述： | 16-BIT, DSP-NUM CONTROLLED OSCILLATOR, PQFP48 |
| 封裝： | TQFP-48 |
| 文件頁數(shù)： | 13/16頁 |
| 文件大小： | 218K |
| 代理商： | AD9830AST |
AD9830
REV. A
–13–
Grounding and Layout
T he printed circuit board that houses the AD9830 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 AD9830 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 AD9830. If the AD9830 is in a system where mul-
tiple devices require AGND to DGND connections, the con-
nection should be made at one point only, a star ground point
that should be established as close as possible to the AD9830.
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 AD9830 to avoid noise coupling. T he power
supply lines to the AD9830 should use as large a track as is pos-
sible to provide low impedance paths and reduce the effects of
glitches on the power supply line. Fast switching signals like
clocks should be shielded with digital ground to avoid radiating
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 ef-
fects of feedthrough through the board. A microstrip technique
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 AD9830 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 AD9830, it is recommended that the system’s
AVDD supply be used. T his supply should have the recom-
mended analog supply decoupling between the AVDD pins of
the AD9830 and AGND and the recommended digital supply
decoupling capacitors between the DVDD pins and DGND.
AD9830 E valuation Board
T he AD9830 Evaluation Board allows designers to evaluate the
high performance AD9830 DDS Modulator with a minimum of
effort.
T o prove that this device will meet the user’s waveform synthesis
requirements, the user only requires a +5 V power supply, an
IBM-compatible PC and a spectrum analyzer along with the
evaluation board. T he evaluation setup is shown below.
T he DDS Evaluation kit includes a populated, tested AD9830
printed circuit board along with software which controls the
AD9830 in a Windows environment.
AD9830.EXE
IBM COMPATIBLE PC
PARALLEL PORT
CENTRONICS
PRINTER CABLE
AD9830 EVALUATION
BOARD
Figure 25. AD9830 Evaluation Board Setup
Using the AD9830 E valuation Board
T he AD9830 Evaluation kit is a test system designed to simplify
the evaluation of the AD9830. Provisions to control the AD9830
from the printer port of an IBM-compatible PC are included
along with the necessary software. An application note is also
available with the evaluation board which gives information on
operating the evaluation board.
Prototyping Area
An area is available on the evaluation board where the user can
add additional circuits to the evaluation test set. Users may
want to build custom analog filters for the outputs or add buf-
fers and operational amplifiers which are to be used in the final
application.
X O vs. E xternal Clock
T he AD9830 can operate with master clocks up to 50 MHz. A
50 MHz oscillator is included on the evaluation board. How-
ever, this oscillator can be removed and an external CMOS
clock connected to the part, if required.
Power Supply
Power to the AD9830 evaluation board must be provided exter-
nally through the pin connections. T he power leads should be
twisted to reduce ground loops.
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|---|---|
| AD9831 | CMOS Complete DDS |
| AD9831AST | CMOS Complete DDS |
| AD9832 | CMOS Complete DDS |
| AD9832BRU | CMOS Complete DDS |
| AD9833 | +2.5 V to +5.5 V, 25 MHz Low Power CMOS Complete DDS |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD9830AST-REEL | 制造商:Analog Devices 功能描述:Direct Digital Synthesizer 50MHz 1-DAC 10-Bit Parallel 48-Pin LQFP T/R 制造商:Rochester Electronics LLC 功能描述:50 MHZ 10-BIT DDS DAC I.C. - Tape and Reel |
| AD9830ASTZ | 功能描述:IC DDS 10BIT 50MHZ CMOS 48-TQFP 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 標準包裝: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) |
| AD9830ASTZ-REEL | 功能描述:IC DDS 10BIT 50MHZ 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 標準包裝: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) |
| AD9831 | 制造商:AD 制造商全稱:Analog Devices 功能描述:CMOS Complete DDS |
| 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 |
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