AD9951_15 Datasheet, PDF (1/28 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
AD9951
FEATURES
PLL REFCLK multiplier (4× to 20×)
400 MSPS internal clock speed
Integrated 14-bit DAC
32-bit tuning word
Internal oscillator, can be driven by a single crystal
Phase modulation capability
Multichip synchronization
Phase noise ≤ –120 dBc/Hz @ 1 kHz offset (DAC output)
Excellent dynamic performance
APPLICATIONS
>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
Agile LO frequency synthesis
Programmable clock generators
Test and measurement equipment
Acousto-optic device drivers
Support for 5 V input levels on most digital inputs
FUNCTIONAL BLOCK DIAGRAM
DDS CORE
PHASE
ACCUMULATOR
Z^–1
32
PHASE
OFFSET
19
COS(X)
AD9951
14
DAC
14
SYSTEM
CLOCK
Z^–1
DAC_R_SET
IOUT
IOUT
32
14
I/O UPDATE
SYNC_CLK
REFCLK
REFCLK
0
M
U
X
SYNC
OSCILLATOR/BUFFER
ENABLE
4× TO 20×
CLOCK
MULTIPLIER
TIMING AND CONTROL LOGIC
÷4
CONTROL REGISTERS
M
U
X
SYSTEM
CLOCK
SYNC_IN
OSK
PWRDWNCTL
CRYSTAL OUT
I/O PORT
Figure 1.
RESET
Rev. A
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