12 LVDS/24 CMOS Output Clock Generator
with Integrated 2.4 GHz VCO
AD9522-1
Rev. 0
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FEATURES
Low phase noise, phase-locked loop (PLL)
On-chip VCO tunes from 2.27 GHz to 2.65 GHz
Supports external 3.3 V/5 V VCO/VCXO to 2.4 GHz
1 differential or 2 single-ended reference inputs
Accepts CMOS, LVPECL, or LVDS references to 250 MHz
Accepts 16.62 MHz to 33.3 MHz crystal for reference input
Optional reference clock doubler
Reference monitoring capability
Auto and manual reference switchover/holdover modes,
with selectable revertive/nonrevertive switching
Glitch-free switchover between references
Automatic recovery from holdover
Digital or analog lock detect, selectable
Optional zero delay operation
Twelve 800 MHz LVDS outputs divided into 4 groups
Each group of 3 has a 1-to-32 divider with phase delay
Additive broadband jitter as low as 242 fs rms
Channel-to-channel skew grouped outputs < 60 ps
Each LVDS output can be configured as 2 CMOS outputs
(for fOUT ≤ 250 MHz)
Automatic synchronization of all outputs on power-up
Manual synchronization of outputs as needed
SPI- and IC-compatible serial control port
64-lead LFCSP
Nonvolatile EEPROM stores configuration settings
APPLICATIONS
Low jitter, low phase noise clock distribution
Clock generation and translation for SONET, 10Ge, 10G FC,
and other 10 Gbps protocols
Forward error correction (G.710)
Clocking high speed ADCs, DACs, DDSs, DDCs, DUCs, MxFEs
High performance wireless transceivers
ATE and high performance instrumentation
Broadband infrastructures
GENERAL DESCRIPTION
function with subpicosecond jitter performance, along with an
on-chip PLL and VCO. The on-chip VCO tunes from 2.27 GHz
to 2.65 GHz. An external 3.3 V/5 V VCO/VCXO of up to 2.4 GHz
can also be used.
FUNCTIONAL BLOCK DIAGRAM
OPTIONAL
REF1
REF2
CLK
LF
SW
IT
C
H
O
VER
A
ND
M
O
N
IT
O
R
PL
L
DIVIDER
AND MUXES
ZERO
DELAY
CP
VCO
STATUS
MONITOR
SPI/I2C CONTROL
PORT AND
DIGITAL LOGIC
EEPROM
AD9522
OUT0
OUT1
OUT2
DIV/Φ
OUT3
OUT4
OUT5
DIV/Φ
OUT6
OUT7
OUT8
DIV/Φ
OUT9
OUT10
OUT11
DIV/Φ
LVDS/
CMOS
REFIN
07
220-
001
Figure 1.
The AD9522 serial interface supports both SPI and I2C ports.
An in-package EEPROM can be programmed through the
serial interface and store user-defined register settings for
power-up and chip reset.
The AD9522 features 12 LVDS outputs in four groups. Any of
the 800 MHz LVDS outputs can be reconfigured as two
250 MHz CMOS outputs.
Each group of outputs has a divider that allows both the divide
ratio (from 1 to 32) and the phase (coarse delay) to be set.
The AD9522 is available in a 64-lead LFCSP and can be operated
from a single 3.3 V supply. The external VCO can have an
operating voltage up to 5.5 V.
The AD9522 is specified for operation over the standard industrial
range of 40°C to +85°C.
The
AD9520-1 is an equivalent part to the AD9522-1 featuring
LVPECL/CMOS drivers instead of LVDS/CMOS drivers.
1 The AD9522 is used throughout this data sheet to refer to all the members of the AD9522 family. However, when AD9522-1 is used, it is referring to that specific
member of the AD9522 family.