AD9953_15 Datasheet, PDF (1/32 Pages) Analog Devices – 400 MSPS, 14-Bit, 1.8 V CMOS Direct Digital Synthesizer

FEATURES
400 MSPS internal clock speed
Integrated 14-bit DAC
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
1.8 V power supply
Software and hardware controlled power-down
48-lead TQFP/EP package
Support for 5 V input levels on most digital inputs
400 MSPS, 14-Bit, 1.8 V CMOS
Direct Digital Synthesizer
AD9953
PLL REFCLK multiplier (4× to 20×)
Internal oscillator, can be driven by a single crystal
Phase modulation capability
Multichip synchronization
APPLICATIONS
Agile VHF/UHF LO frequency synthesis
FM chirp source for radar and scanning systems
Nonlinear-shaped PSK/FSK modulator
Test and measurement equipment
FUNCTIONAL BLOCK DIAGRAM
I/O UPDATE
SYNC_CLK
REFCLK
REFCLK
RAM
1024 × 32
STATIC RAM
DATA
32
M
U
X
DDS CORE
PHASE
ACCUMULATOR
Z^–1
PHASE
OFFSET
19
COS(X)
AD9953
14
DAC
Z^–1
32
3 32
10
M
0
U
X
SYNC
OSCILLATOR/BUFFER
ENABLE
4×–20×
CLOCK
MULTIPLIER
MUX
14
14
RAM DATA <31:18>
TIMING AND CONTROL LOGIC
PHASE
OFFSET
WORD
÷4
CONTROL REGISTERS
M
U
X
SYSTEM
CLOCK
SYSTEM
14
CLOCK
DAC_R_SET
IOUT
IOUT
SYNC_IN
OSK
PWRDWNCTL
CRYSTAL OUT
PS<1:0> I/O PORT
Figure 1.
RESET
Rev. A
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: [phone]
www.analog.com
Fax: [phone] ©2004–2009 Analog Devices, Inc. All rights reserved.