AD9953 Datasheet, PDF (1/42 Pages) Analog Devices – 400 MSPS 14-Bit, 1.8V CMOS Direct Digital Synthesizer

A
400 MSPS 14-Bit, 1.8V CMOS
Direct Digital Synthesizer
Preliminary Technical Data
AD9953
FEATURES
400 MSPS Internal Clock Speed
Integrated 14-bit D/A Converter
Programmable phase/amplitude dithering
32-bit Tuning Word
Phase Noise <= -125 dBc/Hz @ 1KHz offset (DAC output)
Excellent Dynamic Performance
80dB SFDR @ 130MHz (+/- 100KHz Offset) Aout
Serial I/O Control
1.8V Power Supply
Software and Hardware controlled power down
48-lead EPAD-TQFP package
Linear and non-linear frequency sweeping capability
Integrated 1024x32 word RAM
Support for 5v input levels on most digital inputs
PLL REFCLK multiplier (4X to 20X)
Internal oscillator, can be driven by a single crystal
Phase modulation capability
Multi-Chip Synchronization
APPLICATIONS
Agile L.O. Frequency Synthesis
FM Chirp Source for Radar and Scanning Systems
Automotive Radar
Test and Measurement Equipment
PSK/FSK/Ramped FSK modulation
Functional Block Diagram
I/O
Update
Sync
Out
RefClk
RefClk
Static RAM
1024 x 32
32
RAM
Data
M
U ³²
X
Phase
Accumulator
z^-1
Σ
DDS Core
Phase
Offset
32
Σ
19
COS(x)
32
3
10
z^-1
32
32
14
DAC
System Clock
DAC
I-set
Aout
Aout
14
M0
U
X
Oscillator/Buffer
ENABLE
DDS Clock
14 _θ
RAM Data <31:18>
Timing & Control Logic
SYNC
4
Control Registers
4x-20x Clock
Multipler
M
U
X ^{System Clock}
OSK
PwrDwn
Crystal
Out
PS<1:0> IO Port Reset
REV. PrB 1/30/2003
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