SY87739L_11 Datasheet, PDF (1/17 Pages) Micrel Semiconductor – Protocol Transparent, 3.3V, 10MHz to 729MHz, Fractional-N Synthesizer

SY87739L
Protocol Transparent, 3.3V,
10MHz to 729MHz, Fractional-N Synthesizer
General Description
The SY87739L is a complete rate independent frequency
synthesizer integrated circuit. From a single reference
source, this device generates a differential PECL output
frequency from 10MHz up to 729MHz
The SY87739L generates an exactly correct reference
frequency for common data transport protocols. This is
especially important in transponder applications, where a
standards compliant protocol data unit must be generated
downstream, even in the absence of any signal from the
associated upstream interface. In addition, the SY87739L
will generate exactly correct reference frequencies for
common data transport protocols augmented by forward
error correction codes. The SY87739L accepts
configuration via a MicroWire™ interface
For proprietary applications, the SY87739L generates
reference frequencies guaranteed to enable the SY87721L
CDR to lock to any possible baud rate from 28Mbps to
2.7Gbps.
Data sheets and support documentation can be found on
Micrel’s web site at: www.micrel.com.
Features
• Protocol transparent fractional-N synthesizer from
10MHz to 729MHz from a single 27MHz reference
oscillator
• Generates exactly the correct frequency for common
transport protocols with or without FEC
• Directly enables SY87721L CDR to lock onto any data
rate within its range
• Exceeds BellCore and ITU jitter generation
specifications
• Programmable via MicroWire™ interface
• Available in 32-Pin ePad-TQFP package
Applications
• Metro access system
• Transponders
• Bullet item
• Multiplexers: access, Add Drop Mux
• SONET/SDH/ATM-based transmission systems,
modules and test equipment
• Broadband cross-connects
• Fiber optic test equipment
• Protocols supported: OC-1, OC-3, OC-12, OC-48, ATM,
Gigabit Ethernet, Fast Ethernet, Fibre Channel and 2X
Fibre Channel, 1394, InfiniBand, and Proprietary
Optical Transport
Typical Application Circuit and Typical Performance
AnyClock and AnyRate are registered trademarks of Micrel, Inc.
MicroWire is a trademark of National Semiconductor
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel [phone] • fax + 1 [phone] • http://www.micrel.com
June 2011
M9999-061511
[e-mail] or [phone]