6-Output Clock Generator with
Integrated 2.8 GHz VCO
AD9518-0
FUNCTIONAL BLOCK DIAGRAM
FEATURES
CP
LF
Low phase noise, phase-locked loop (PLL)
On-chip VCO tunes from 2.55 GHz to 2.95 GHz
External VCO/VCXO to 2.4 GHz optional
1 differential or 2 single-ended reference inputs
Reference monitoring capability
Auto and manual reference switchover/holdover modes
Autorecover from holdover
Accepts LVPECL, LVDS, or CMOS references to 250 MHz
Programmable delays in path to PFD
Digital or analog lock detect, selectable
3 pairs of 1.6 GHz LVPECL outputs
REF1
REF2
STATUS
MONITOR
REFIN
CLK
VCO
DIVIDER
AND MUXs
OUT0
OUT1
OUT2
OUT3
OUT4
OUT5
DIV/Φ
DIV/Φ
DIV/Φ
LVPECL
LVPECL
LVPECL
Each output pair shares a 1-to-32 divider with coarse
phase delay
Additive output jitter 225 fs rms
SERIAL CONTROL PORT
AND
Channel-to-channel skew paired outputs of <10 ps
Automatic synchronization of all outputs on power-up
Manual synchronization of outputs as needed
Serial control port
AD9518-0
DIGITAL LOGIC
Figure 1.
Available in 48-lead LFCSP
APPLICATIONS
Low jitter, low phase noise clock distribution
Clocking high speed ADCs, DACs, DDSs, DDCs, DUCs, MxFEs
High performance wireless transceivers
10/40/100 Gb/sec networking line cards, including SONET,
Synchronous Ethernet, OTU2/3/4
The AD9518-0 features six LVPECL outputs (in three pairs).
The LVPECL outputs operate to 1.6 GHz.
Each pair of outputs has dividers that allow both the divide ratio
and coarse delay (or phase) to be set. The range of division for
the LVPECL outputs is 1 to 32.
High performance instrumentation
Broadband infrastructure
ATE
The AD9518-0 is available in a 48-lead LFCSP and can be
operated from a single 3.3 V supply. An external VCO, which
requires an extended voltage range, can be accommodated
by connecting the charge pump supply (VCP) to 5 V. A separate
LVPECL power supply can be from 2.5 V to 3.3 V (nominal).
GENERAL DESCRIPTION
The AD9518-01 provides a multi-output clock distribution
function with subpicosecond jitter performance, along with an
on-chip PLL and VCO. The on-chip VCO tunes from 2.55 GHz
to 2.95 GHz. Optionally, an external VCO/VCXO of up to
2.4 GHz can be used.
The AD9518-0 is specified for operation over the industrial
range of −40°C to +85°C.
1 AD9518 is used throughout to refer to all the members of the AD9518
family. However, when AD9518-0 is used, it is referring to that specific
member of the AD9518 family.
The AD9518-0 emphasizes low jitter and phase noise to
maximize data converter performance, and it can benefit other
applications with demanding phase noise and jitter requirements.
Rev. A
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