AD9951 Datasheet PDF - Analog Devices

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AD9951
Analog Devices

Part Number AD9951
Description CMOS Direct Digital Synthesize
Page 30 Pages


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Data Sheet
400 MSPS 14-Bit, 1.8 V CMOS
Direct Digital Synthesize
AD9951
FEATURES
Phase-locked loop (PLL) REFCLK multiplier (4× to 20×)
400 MSPS internal clock speed
Integrated 14-bit digital-to-analog converter (DAC)
32-bit tuning word
Internal oscillator; can be driven by a single crystal
Phase modulation capability
Multichip synchronization
Phase noise ≤ −120 dBc/Hz at 1 kHz offset (DAC output)
Excellent dynamic performance
>80 dB SFDR at 160 MHz (±100 kHz offset) AOUT
Serial I/O control
1.8 V power supply
Software and hardware controlled power down
APPLICATIONS
Agile local oscillator (LO) frequency synthesis
Programmable clock generators
Test and measurement equipment
Acousto-optic device drivers
48-lead TQFP/EP package
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_RSET
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. B
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AD9951 datasheet pdf
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