FEATURES
400 MSPS internal clock speed Integrated 14-bit DAC 32-bit tuning word Phase noise ≤ –120 dBc/Hz @ 1 kHz offset...
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
1024 × 32 STATIC RAM
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
M0 U X
SYNC
OSCILLATOR/BUFFER
ENABLE
4×–20× CLOCK...
