AD9952| Datasheet

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400 MSPS 14-Bit, 1.8 V CMOS Direct Digital Synthesizer AD9952
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 PLL REFCLK multiplier (4 to 20 ) Internal oscillator, can be driven by a single crystal Phase modulation capability Multichip synchronization High speed comparator (200 MHz toggle rate)

APPLICATIONS
Agile LO frequency synthesis Programmable clock generators Test and measurement equipment Acousto-optic device drivers

GENERAL DESCRIPTION
The AD9952 is a direct digital synthesizer (DDS) featuring a 14-bit DAC (digital-to-analog converter) and operating up to 400 MSPS. The AD9952 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 AD9952 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 the AD9952 via a serial I/O port. The AD9952 is specified to operate over the extended industrial temperature range of -40 C to +105 C.

FUNCTIONAL BLOCK DIAGRAM
DDS CORE PHASE ACCUMULATOR Z 1 PHASE OFFSET 32 19 COS(X) 14 DAC

AD9952
DAC_R SET IOUT IOUT

FREQUENCY TUNING WORD

SYSTEM CLOCK

CLEAR PHASE ACCUMULATOR

AMPLITUDE SCALE FACTOR

Z 1

DDS CLOCK

SYNC_IN

I/O UPDATE SYNC_CLK M U X 0 SYNC

TIMING AND CONTROL LOGIC

OSK PWRDWNCTL

CONTROL REGISTERS

COMPARATOR COMP_IN COMP_IN

OSCILLATOR/BUFFER REFCLK REFCLK ENABLE 4 TO 20 CLOCK MULTIPLIER M U X SYSTEM CLOCK

COMP_OUT
03358-001

CRYSTAL OUT

I/O PORT

RESET

Figure 1.
Rev. A
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