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PDF AD9955 Data sheet ( Hoja de datos )
| Número de pieza | AD9955 | |
| Descripción | 85Mhz Direct Digital Synthesizer | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AD9955 (archivo pdf) en la parte inferior de esta página. Total 12 Páginas | ||
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,. ANALOG s -<:-<- I17t:J700 '8' G v- H-V 9'&::sO
85 MHzDirect
W DEVICES
DigitaSl ynthesizer
FEATURES
100 MHz Typical/8S MHz Minimum Clock Rate
32-Bit Phase Accumulator
12-Bit Sine Output
>90 dB Spurious Free Dynamic Range
Continuous Frequency Update
On-Board Data Ready Signal
APPLICATIONS
Frequency Synthesizers
DDS Tuning
Digital Demodulation
FM Modulators
AD9955
I
GENERAL DESCRIPTION
The AD99SS is a 100 MHz direct digital synthesizer for fre-
quency synthesis applications. It comprises a 32-bit phase accu-
mulator and a IS-bit phase-to-12-bit sine amplitude converter.
The control logic is CMOS compatible, and the clock input is
TTL. CMOS outputs are latched on board, and a data ready
signal is provided.
Designed for applications in communications, instrumentation,
and military systems, the AD99SS can be combined with a clock
reference and a DAC such as the AD97l3B or AD9721 to form
a digitally-controlled analog frequency reference.
The AD99SS is available in an SO-leadplastic quad flatpack
(PQFP) for commercial (O°Cto + 70°C) temperature range appli-
cations. Contact the factory for information concerning the avail-
ability of a military temperature range device.
PSEl
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DATA
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REV.0
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O.Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329.4700
Fax: 617/326-8703
--
--
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1 page  
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DIE INFORMATION
Die Dimensions. . . . . . . . . . . . .215 x 199 x 20.7 (:!: 1) mils
PadDimensions
4x4mils
Metalization
Aluminum
Backing
SubstratePotential
None
Ground
Passivation
Oxynitride
Die Attach
Bond Wire
Epoxy
Gold
AD9955
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AD9955 Chip Layout
FIXED
FREQUENCY
REFERENCE
GENERATES SAMPLES
OF A SINE WAVE
IJ
I - - - - D-;-GITc;AcLuli - - - -I
CONVERTS SINE
SAMPLES INTO
ANALOG SIGNAL
I
II PHASE
N
PHASE
ACCUMULATOR
\ ---------------
SPECIFIES OUTPUT
FREQUENCY AS
FRACTION OF CLOCK
FREQUENCY
.,,1111111111111111
SINE
AMPLITUDE
CONVERTER
~
DIGITAL.
TO.
ANALOG
CONVERTER
rv
fo
rv
Figure 1. Block Diagram of DDS Generator
DDS
Direct digital synthesis (DDS) is a method of deriving a wide-
band, digitally controlled frequency (sine wave) synthesizer from
a single reference frequency (system clock).
The circuit has three major components:
1. Phase accumulator
2. Phase-to-amplitude converter
3. Digital-to-analog converter
These major stages and their relationships to one another are
illustrated in the block diagram shown above.
The phase accumulator is a digital device which generates the
phase increment of the output waveform. Its input is a digital
word which (with the reference oscillator) determines the fre-
quency of the output waveform. The output of the phase accu-
mulator stage represents the current phase of the generated
waveform. In effect, the accumulator serves as a variable-
frequency oscillator generating a digital ramp. The frequency of
the signal is defined by .lphase as
.lphase
.lphase
four = .A..phaseMAXfCLOCK= --yr- !cLOCK
Translating phase information from the phase accumulator into
amplitude data takes place in the phase-to-amplitude converter.
This is most commonly accomplished by means of a look-up
table (LUT) stored in memory, but may be calculated instead
using a digital algorithm to minimize circuit complexity and/or
increase the update rate.
In the final step of frequency synthesis, amplitude data is con-
verted into an analog signal. This is done by a digital-to-analog
(D/ A) converter which must have good linearity; low glitch
impulse; and fast, symmetrical rise and fall times. When it does,
the frequency synthesizer is able to produce a spectrally pure
waveform.
REV. 0
-5-
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5 Page 
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AD9955/AD9721 80 MSPS 8.10 MHz
10dB/
,
II
<lMKR
-
16.21MHz
-67.95dB -
REF -2.6 dam
AD9955/AD9721 100 MSPS 10.10 MHz
10dB/
..
AD9955
II
6MKR
-
30.10MHz
-66.85dB
REF-2.6 dam
-
i7
START 200 kHz
STOP 40.00 MHz
Figure 16. AD9955/AD9721 Output Spectrum
AD9955/AD9721 80 MSPS 20.10 MHz
10dB/
II
6MKR
-396 kHz
-68.50dB
REF-2.6 dam
-
-
START 200 kHz
I
STOP 50.00 MHz
Figure 19. AD9955/AD9721 Output Spectrum
AD9955/AD9721 100 MSPS 25.10 MHz
10dB/
II
6MKR
-400 kHz
-63.42 dB
REF-2.6 dam
-
-
I 'I
CENTER 20.00 MHz
SPAN 2.50 MHz
Figure 17. AD9955/AD9721 Output Spectrum
AD9955/AD9721 80 MSPS 26.60 MHz
1OdB/
II
6MKR
204 kHz
-60.97 dB
REF-2.6 dam
-
-
L
CENTER 25.00 MHz
.,.
,"
SPAN 2.50 MHz
Figure 20. AD9955/AD9721 Output Spectrum
AD99551AD9721 100 MSPS 33.30 MHz
10dBI
II
6MKR
200kHz
-66.80dB
REF-2.6 dam
e--
I--
7
". II ".L
CENTER 26.500 MHz
I
'.", . I
SPAN 2.50 MHz
Figure 18. AD9955/AD9721 Output Spectrum
.
CENTER 33.00 MHz
"
nilI I 1.1
I1
SPAN 2.50 MHz
Figure 21. AD9955/AD9721 Output Spectrum
REV. 0
-11-
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11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet AD9955.PDF ] | |
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