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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AD9954
TABLE OF CONTENTS
General Description ......................................................................... 3
AD9954—Electrical Specifications ................................................ 4
Absolute Maximum Ratings............................................................ 7
Pin Configurations ........................................................................... 8
Pin Function Descriptions .............................................................. 9
Typical Performance Characteristics ........................................... 10
Theory of Operation ...................................................................... 13
Component Blocks ..................................................................... 13
Modes of Operation ................................................................... 22
REVISION HISTORY
Revision 0: Initial Version
Serial Port Operation................................................................. 30
Instruction Byte .......................................................................... 32
Serial Interface Port Pin Description....................................... 32
MSB/LSB Transfers .................................................................... 32
RAM I/O Via Serial Port ........................................................... 32
Suggested Application Circuits..................................................... 35
Outline Dimensions ....................................................................... 36
ESD Caution................................................................................ 36
Ordering Guide .......................................................................... 36
Rev. 0 | Page 2 of 36



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GENERAL DESCRIPTION
The AD9954 is a direct digital synthesizer (DDS) featuring a
14-bit DAC operating up to 400 MSPS. The AD9954 uses
advanced DDS technology, coupled with an internal high speed,
high performance DAC to form a digitally programmable,
complete high frequency synthesizer capable of generating a
frequency-agile analog output sinusoidal waveform at up to
200 MHz. The AD9954 is designed to provide fast frequency
hopping and fine tuning resolution (32-bit frequency tuning
word). The frequency tuning and control words are loaded into
AD9954
the AD9954 via a serial I/O port. The AD9954 includes an
integrated 1024 × 32 static RAM to support flexible frequency
sweep capability in several modes. The AD9954 also supports a
user defined linear sweep mode of operation. The device
includes an on-chip high speed comparator for applications
requiring a square wave output.
The AD9954 is specified to operate over the extended industrial
temperature range of –40°C to +105°C.
Rev. 0 | Page 3 of 36



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AD9954
AD9954—ELECTRICAL SPECIFICATIONS
Table 1. Unless otherwise noted, AVDD, DVDD = 1.8 V ± 5%, DVDD_I/O = 3.3 V ± 5%, RSET = 3.92 kΩ, External Reference Clock
Frequency = 20 MHz with REFCLK Multiplier Enabled at 20×. DAC Output Must Be Referenced to AVDD, Not AGND.
Parameter
Test
Temp Level Min
Typ Max
Unit
REF CLOCK INPUT CHARACTERISTICS
Frequency Range
REFCLK Multiplier Disabled
FULL VI
1
400 MHz
REFCLK Multiplier Enabled at 4×
REFCLK Multiplier Enabled at 20×
Input Capacitance
Input Impedance
FULL
FULL
25°C
25°C
VI
VI
V
V
20
4
100
20
3
1.5
MHz
MHz
pF
kΩ
Duty Cycle
25°C V 50 %
Duty Cycle with REFCLK Multiplier Enabled
REFCLK Input Power1
25°C V
FULL IV
35
–15
65
0 +3
%
dBm
DAC OUTPUT CHARACTERISTICS
Resolution
14 Bits
Full Scale Output Current
Gain Error
Output Offset
Differential Nonlinearity
Integral Nonlinearity
25°C
25°C I
25°C I
25°C V
25°C V
5
–10
10 15
+10
0.6
1
2
mA
%FS
µA
LSB
LSB
Output Capacitance
25°C V
5
pF
Residual Phase Noise @ 1 kHz Offset, 40 MHz AOUT
REFCLK Multiplier Enabled @ 20×
25°C V
–105
dBc/Hz
REFCLK Multiplier Enabled @ 4×
REFCLK Multiplier Disabled
Voltage Compliance Range
Wideband SFDR
1 MHz to 10 MHz Analog Out
25°C V
25°C V
25°C I
25°C V
AVDD – 0.5
–115
–132
AVDD + 0.5
dBc/Hz
dBc/Hz
V
73 dBc
10 MHz to 40 MHz Analog Out
25°C V 67 dBc
40 MHz to 80 MHz Analog Out
25°C V 62 dBc
80 MHz to 120 MHz Analog Out
25°C V 58 dBc
120 MHz to 160 MHz Analog Out
Narrow Band SFDR
40 MHz Analog Out (±1 MHz)
40 MHz Analog Out (±250 kHz)
25°C V 52 dBc
25°C V 87 dBc
25°C V 89 dBc
40 MHz Analog Out (±50 kHz)
25°C V 91 dBc
40 MHz Analog Out (±10 kHz)
25°C V 93 dBc
80 MHz Analog Out (±1 MHz)
25°C V 85 dBc
80 MHz Analog Out (±250 kHz)
80 MHz Analog Out (±50 kHz)
80 MHz Analog Out (±10 kHz)
120 MHz Analog Out (±1 MHz)
120 MHz Analog Out (±250 kHz)
25°C V 87 dBc
25°C V 89 dBc
25°C V 91 dBc
25°C V 83 dBc
25°C V 85 dBc
120 MHz Analog Out (±50 kHz)
25°C V 87 dBc
120 MHz Analog Out (±10 kHz)
25°C V 89 dBc
160 MHz Analog Out (±1 MHz)
25°C V 81 dBc
160 MHz Analog Out (±250 kHz)
160 MHz Analog Out (±50 kHz)
160 MHz Analog Out (±10 kHz)
25°C V 83 dBc
25°C V 85 dBc
25°C V 87 dBc
Rev. 0 | Page 4 of 36



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