AD9859 Datasheet | Analog Devices

FEATURES 400 MSPS internal clock speed Integrated 10-bit DAC 32-bit tuning word Phase noise ≤ - 120 d Bc/Hz @ 1 k Hz offset (DAC output) Excellent dynamic performance >75 d B SFDR @ 160 MHz (±100 k Hz 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 APPLICATIONS Agile LO frequency synthesis Programmable clock generators Test and measurement equipment mercial and amateur radio exciter GENERAL DESCRIPTION The AD9859 is a direct digital synthesizer (DDS) featuring a 10-bit DAC operating at up to 400 MSPS. The AD9859 uses advanced DDS technology, coupled with an internal high speed, high performance DAC to form a digitally programmable, plete high frequency synthesizer capable of generating a frequency-agile analog output sinusoidal waveform at up to 200 MHz. The AD9859 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 AD9859 via a serial I/O port. The AD9859 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) 10 DAC DAC_RSET IOUT IOUT FREQUENCY TUNING WORD PHASE ACUMULATOR RESET AMPLITUDE SCALE FACTOR SYSTEM CLOCK DDS CLOCK Z- 1 SYNC_IN I/O UPDATE M U X 0 SYNC TIMING AND CONTROL LOGIC OSK PWRDWNCTL SYNC_CLK ÷4 CONTROL REGISTERS OSCILLATOR/BUFFER REFCLK REFCLK ENABLE 4×- 20× CLOCK MULTIPLIER M U X SYSTEM CLOCK 03375-0-001 CRYSTAL OUT I/O PORT RESET Figure 1. Rev. 0 Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of...