GENERAL DESCRIPTION

The ADF4378 is a high performance, ultra-low jitter, integer-N

phased locked loop (PLL) with an integrated voltage controlled

oscillator (VCO) and system reference (SYSREF) retimer ideally

suited for data converter and mixed signal front end (MxFE) clock

applications. The high performance PLL has a −239 dBc/Hz: normalized

in-band phase noise floor, ultra-low 1/f noise, and a high

phase/frequency detector (PFD) frequency that can achieve ultralow

in-band noise and integrated jitter. The fundamental VCO and

output divider of the ADF4378 generate frequencies from 800 MHz

to 12.8 GHz. The ADF4378 integrates all necessary power-supply

bypass capacitors, which saves board space on compact boards.

For multiple data converter and MxFE clock applications, the

ADF4378 simplifies clock alignment and calibration routines required

with other clock solutions by implementing the automatic

reference to output synchronization feature, the matched reference

to output delays across process, voltage, and temperature feature,

and the less than ±0.1 ps, jitter free reference to output delay

adjustment capability feature.

FEATURES

► Output frequency range: 800 MHz to 12.8 GHz

► Jitter = 18 fsRMS (integration bandwidth: 100 Hz to 100 MHz)

► Jitter = 27 fsRMS (ADC SNR method)

► Wideband noise floor: −160 dBc/Hz at 12 GHz

► Retimed LVDS SYSREF output

► General-purpose pulse retimer for SYSREF, SYNC, and MCS

applications

► PLL specifications

► −239 dBc/Hz: normalized in-band phase noise floor

► −147 dBc/Hz: normalized in-band 1/f phase noise floor

► Phase detector frequency up to 500 MHz

► Reference input frequency up to 1000 MHz

► Typical spurious fPFD: −95 dBc PFD at fOUT = 12 GHz

► Reference input to output delay specifications

► Device-to-device standard deviation: 3 ps

► Temperature coefficient: 0.03 ps/°C

► Adjustment step size: < ±0.1 ps

► Multichip output phase alignment

► 3.3 V and 5 V power supplies

► Available in 48-lead, 7 mm × 7 mm LGA package

APPLICATIONS

► High performance data converter and MxFE clocking

► Wireless infrastructure (MC-GSM, 5G)

► Test and measurement

► FPGA with integrated data converters