SY87739L

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-...