AD9557BCPZ

Application Specific Clock/Timing Overview

The AD9557BCPZ is a dual-input multiservice line card adaptive clock translator manufactured by Analog Devices Inc. It provides jitter cleanup and synchronization for systems including synchronous optical networks (OTN/SONET/SDH). The device features a digital PLL with programmable integer and fractional feedback dividers, supporting input reference frequencies from 2 kHz to 1250 MHz and output frequencies from 360 kHz to 1250 MHz. It operates on supply voltages of 1.71 V to 3.465 V and includes an on-chip EEPROM for power-up profiles. The component is housed in a 40-lead, 6 mm × 6 mm LFCSP package.

Application Specific Clock/Timing Feature Summary

• Supports GR-1244 Stratum 3 stability in holdover mode and Telcordia GR-253 jitter specifications up to OC-192.
• Features two reference inputs and two pairs of configurable outputs supporting LVDS, HSTL, or single-ended CMOS formats.
• Includes a programmable digital loop filter covering bandwidths from 0.1 Hz to 5 kHz.
• Provides auto/manual holdover and smooth reference switchover with minimal phase disturbance.

Application Specific Clock/Timing Applications

• Network synchronization, including synchronous Ethernet and SDH to OTN mapping/demapping
• Cleanup of reference clock jitter
• SONET/SDH/OTN clocks up to 100 Gbps, including FEC
• Stratum 3 holdover, jitter cleanup, and phase transient control

Application Specific Clock/Timing Procurement Notes

Verify the specific ordering suffix against the manufacturer's current documentation to confirm packaging type and availability status. Confirm that the voltage supply range and operating temperature specifications align with the target system requirements before procurement.

Application Specific Clock/Timing Selection Notes

Select this component for applications requiring low loop bandwidth clock multiplication and jitter reduction. Ensure the design accommodates the required supply voltage partitions (AVDD/DVDD) and utilizes the SPI/I2C interface for configuring the digital PLL parameters and reference profiles.

Application Specific Clock/Timing Part Context

This part belongs to the AD9557 series of clock translators. For designs requiring additional I/O capacity, the AD9558 serves as a variant offering four inputs and six outputs based on the same core architecture.

Application Specific Clock/Timing Replacement Considerations

The AD9558 is a documented alternative within the same family, providing expanded input and output capabilities while maintaining similar core functionality.