AD9954 Datasheet PDF - Analog Devices

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AD9954
Analog Devices

Part Number AD9954
Description 400 MSPS 14-Bit/ 1.8 V CMOS Direct Digital Synthesizer
Page 30 Pages


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400 MSPS 14-Bit, 1.8 V CMOS
Direct Digital Synthesizer
AD9954
FEATURES
400 MSPS internal clock speed
Integrated 14-bit DAC
Programmable phase/amplitude dithering
32-bit tuning word
Phase noise ≤ –120 dBc/Hz @ 1 kHz offset (DAC output)
Excellent dynamic performance
>80 dB SFDR @ 160 MHz (±100 kHz offset) AOUT
Serial I/O control
Ultrahigh speed analog comparator
Automatic linear and nonlinear frequency sweeping
capability
4 frequency/phase offset profiles
1.8 V power supply
Software and hardware controlled power-down
48-lead TQFP/EP package
Integrated 1024 word × 32-bit RAM
Support for 5 V input levels on most digital inputs
PLL REFCLK multiplier (4× to 20×)
Internal oscillator, can be driven by a single crystal
Phase modulation capability
Multichip synchronization
APPLICATIONS
Agile LO frequency synthesis
Programmable clock generator
FM chirp source for radar and scanning systems
Automotive radar
Test and measurement equipment
Acousto-optic device drivers
FUNCTIONAL BLOCK DIAGRAM
FREQUENCY
ACCUMULATOR 32
STATIC RAM
1024 × 32
RAM
DATA
32
M
U
X
32
DDS CORE
PHASE
ACCUMULATOR
Z–1
32
PHASE
OFFSET
19
COS(X)
AD9954
14 DAC
I/O UPDATE
SYNC_CLK
REFCLK
REFCLK
14
Z–1
32 3
10
0
M
U
X
DDS
32 CLOCK
MUX
RAM DATA 14
<31:18>
θ
TIMING AND CONTROL LOGIC
SYNC
÷4
CONTROL REGISTERS
OSCILLATOR/BUFFER
ENABLE
4×–20×
CLOCK
MULTIPLIER
M
U SYSTEM
X CLOCK
SYSTEM
14 CLOCK
COMPARATOR
DAC_RSET
IOUT
IOUT
SYNC_IN
OSK
PWRDWNCTL
COMP_IN
COMP_IN
COMP_OUT
CRYSTAL OUT
PS<1:0> I/O PORT
Figure 1. 48-LeadTQFP/EP
RESET
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 that may result from its use.
Specifications subject to change without notice. No license is granted by implication
or otherwise under any patent or patent rights of Analog Devices. Trademarks and
registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.326.8703 © 2003 Analog Devices, Inc. All rights reserved.

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