ADI AD9956YCPZ-REEL7

The AD9956 is comprised of DDS and PLL circuitry. The DDS features a 14-bit DAC operating at up to 400 MSPS and a 48-bit frequency tuning word (FTW). The PLL circuitry includes a phase frequency detector with scaleable 200 MHz inputs (divider inputs operate up to 655 MHz) and digital control over the charge pump current. The device also includes a 655 MHz CML-mode PECL-compliant driver with programmable slew rates. The AD9956 uses advanced DDS technology, an internal high speed, high performance DAC, and an advanced phase frequency detector/charge pump combination, which, when used with an external VCO, enables the synthesis of digitally programmable, frequency-agile analog output sinusoidal waveforms up to 2.7 GHz. The AD9956 is designed to provide fast frequency hopping and fine tuning resolution (48-bit frequency tuning word). Information is loaded into the AD9956 via a serial I/O port that has a device write-speed of 25 Mb/s. The AD9956 DDS block also supports a user-defined linear sweep mode of operation. The AD9956 is specified to operate over the extended automotive range of -40°C to +125°C.

• 400 MSPS internal DDS clock speed
• 48-bit frequency tuning word
• 14-bit programmable phase offset
• Integrated 14-bit DAC Excellent dynamic performance Phase noise ≤ 135 dBc/Hz @ 1 KHz offset −80 dB SFDR @ 160 MHz (±100 KHz offset IOUT)
• 25 Mb/s write-speed serial I/O control
• 200 MHz phase frequency detector inputs
• 655 MHz programmable input dividers for the phase frequency detector (÷M,÷N) {M, N = 1 ..16} (bypassable)
• Programmable RF divider (÷R) {R = 1,2,4,8} (bypassable)
• 8 phase/frequency profiles
• 1.8 V supply for device operation
• 3.3 V supply for I/O and charge pump
• Software controlled power-down
• 48-lead LFCSP package
• Automatic linear frequency sweeping capability (in DDS)
• Programmable charge pump current (up to 4 mA)
• Phase modulation capability
• Multichip synchronization
• Dual-mode PLL lock detect
• 655 MHz CML-mode PECL-compliant driver

• Agile LO frequency synthesis
• FM chirp source for radar and scanning systems
• Automotive radars
• Test and measurement equipment
• Acousto-optic device drivers