AD9954 Datasheet, PDF (1/36 Pages) Analog Devices – 400 MSPS 14-Bit, 1.8 V CMOS Direct Digital Synthesizer

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
M
STATIC RAM
RAM
DATA
U
X
1024 × 32 ₃₂
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_R_SET
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
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