Dual PLL,
Asynchronous Clock Generator
Data Sheet
AD9576
FEATURES
FUNCTIONAL BLOCK DIAGRAM
Single, low phase noise, fully integrated VCO/fractional-N
PLL core
2
SPI/I C
STATUS
MONITOR
AND PPRx
CONTROL
VCO range: 2375 MHz to 2725 MHz
OPTIONAL
REF2
REF2
Integrated loop filter (requires a single external capacitor)
2 differential, XTAL, or single-ended reference inputs
Reference monitoring capability
DIV
DIV
OUT10
GENERAL-
PURPOSE
PLL
OUT9
OUT8
Automatic redundant XTAL switchover
Minimal transient, smooth switching
Typical RMS jitter
<0.3 ps (12 kHz to 20 MHz), integer-N translations
<0.5 ps (12 kHz to 20 MHz), fractional-N translations
Input frequency
8 kHz, 1.544 MHz, 2.048 MHz, and 10 MHz to 325 MHz
Preset frequency translations via pin strapping (PPRx)
Using a 25 MHz input reference
OUT0
OUT1
OUT2
OUT3
DIV
OPTIONAL
OPTIONAL
REF0
REF0
VCO
OUT4
OUT5
DIV
DIV
DIV
REF1
REF1
OUT6
OUT7
VCO
DIV
AD9576
24.576 MHz, 25 MHz, 33.33 MHz, 50 MHz, 70.656 MHz,
100 MHz, 125 MHz, 148.5 MHz, 156.25 MHz,
161.1328 MHz, 312.5 MHz, 322.2656 MHz, 625 MHz,
or 644.5313 MHz
Using a 19.44 MHz input reference
50 MHz, 100 MHz, 125 MHz, 156.25 MHz, 161.1328 MHz,
or 644.5313 MHz
Figure 1.
GENERAL DESCRIPTION
The AD9576 provides a multiple output clock generator
function comprising two dedicated phase-locked loop (PLL)
cores with flexible frequency translation capability, optimized to
serve as a robust source of asynchronous clocks for an entire
system, providing extended operating life within frequency
tolerance through monitoring of and automatic switchover
between redundant crystal (XTAL) inputs with minimized
switching, induced transients. The fractional-N PLL design is
based on the Analog Devices, Inc., proven portfolio of high
performance, low jitter frequency synthesizers to maximize
network performance, whereas the integer-N PLL provides
general-purpose clocks for use as CPU and field-programmable
gate array (FPGA) reference clocks.
Using a 30.72 MHz input reference
25 MHz, 50 MHz, 100 MHz, 125 MHz, or 156.25 MHz
Single, general-purpose, fully integrated VCO/integer-N
PLL core
VCO range: 750 MHz to 825 MHz
Integrated loop filter
Independent, duplicate reference input or operation from
the fractional-N PLL active reference input
Input frequency: 25 MHz
Preset frequency translations via pin strapping (PPRx)
25 MHz, 33.33 MHz, 50 MHz, 66.67 MHz, 100 MHz,
133.33 MHz, 200 MHz, or 400 MHz
Up to 3 copies of reference clock output
11 pairs of configurable differential outputs
Output drive formats
3 outputs: HSTL, LVDS, HCSL, 1.8 V CMOS, 2.5 V/3.3 V CMOS
8 outputs: HSTL, LVDS, or 1.8 V CMOS
2.5 V or 3.3 V single-supply operation
The AD9576 uses pin strapping to select among a multitude of
power-on ready configurations for its 11 output clocks, which
require only the connection of external pull-up or pull-down
resistors to the appropriate pin program reader pins (PPRx).
These pins provide control of the internal dividers for establishing
the desired frequency translations, clock output functionality,
and input reference functionality. These parameters can also be
manually configured through a serial port interface (SPI).
The AD9576 is packaged in a 64-lead, 9 mm × 9 mm LFCSP,
requiring only a single 2.5 V or 3.3 V supply. The operating
temperature range is −40°C to +85°C.
APPLICATIONS
Ethernet line cards, switches, and routers
Baseband units
SATA and PCI express
Low jitter, low phase noise clock generation
Asynchronous clock generation
Each OUTx output is differential and contains two pins: OUTx
OUTx
and
. For simplicity, the term OUTx refers to the
functional output block containing these two pins.
Rev. 0
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Technical Support
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www.analog.com
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