AD9520 Datasheet PDF

●GENERAL DESCRIPTION

●The AD9520-41 provides a multioutput clock distribution function with subpicosecond jitter performance, along with an on-chip PLL and VCO. The on-chip VCO tunes from 1.4 GHz to 1.8 GHz. An external 3.3 V/5 V VCO/VCXO of up to 2.4 GHz can also be used.

●The AD9520 serial interface supports both SPI and I2C® ports. An in-package EEPROM can be programmed through the serial interface and store user-defined register setting for power-up and chip reset.

●The AD9520 features 12 LVPECL outputs in four groups. Any of the 1.6 GHz LVPECL outputs can be reconfigured as two 250 MHz CMOS outputs.

●FEATURES

●  Low phase noise, phase-locked loop (PLL)

●     On-chip VCO tunes from 1.4 GHz to 1.8 GHz

●     Supports external 0 V to 5 V VCO/VCXO to 2.4 GHz

●     1 differential or 2 single-ended reference inputs

●     Accepts CMOS, LVDS, or LVPECL references to 250 MHz

●     Accepts 16.67 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 recover from holdover

●     Digital or analog lock detect, selectable

●     Optional zero delay operation

●  Twelve 1.6 GHz LVPECL outputs divided into 4 groups

●     Each group of 4 has a 1-to-32 divider with phase delay

●     Additive output jitter as low as 225 fS rms

●     Channel-to-channel skew grouped outputs <16 ps

●     Each LVPECL output can be configured as two CMOS outputs (for fOUT ≤ 250 MHz)

●  Automatic synchronization of all outputs on power-up

●  Manual synchronization of outputs as needed

●  SPI- and I²C-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