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.
The general-purpose pulse retimer feature allows for predictable
and precise multichip clock and pulse alignment for SYSREF,
SYNC, and multichip synchronization (MCS) architectures.
JESD204B and JESD204C Subclass 1 solutions are supported by
pairing the ADF4378 with an integrated circuit (IC) that distributes
pairs of reference and SYSREF signals. The pulse retimer feature
simplifies the system design by allowing the widely distributed
SYSREF to only meet the slower reference frequency timing vs.
the much more stringent output clock timing. Serial-peripheral
interface (SPI) selectable current-mode logic (CML)/low-voltage
positive/pseudo emitter-coupled logic (LVPECL) or low-voltage differential
signaling (LVDS) SYSREF input and LVDS SYSREF output
allow CML to LVDS signal conversion, which simplifies clock
and SYSREF alignment for various converters. The pulse retimer
feature also can be used with transceiver MCS signals and SYNC
signals for other ICs.
Applications
- High Performance Data Converter and MxFE Clocking
- Wireless infrastructure (MC-GSM, 5G)
- Test and Measurement
- FPGA with integrated data converters
