AD9557BCPZ-REEL7

Overview

The AD9557BCPZ-REEL7 is a dual-input multiservice line card adaptive clock translator manufactured by Analog Devices Inc. It operates within an industrial temperature range of -40°C to +85°C and utilizes a 40-lead, 6 mm × 6 mm LFCSP-VQ package. The device supports input reference frequencies from 2 kHz to 1250 MHz and generates output clocks ranging from 360 kHz to 1250 MHz. It features a digital PLL with programmable integer and fractional feedback dividers, supporting low noise system clock multiplication and jitter cleanup for synchronous Ethernet and SONET/SDH applications.

Feature Summary

• Dual reference inputs (single-ended or differential) with programmable 20-bit input divider
• Digital PLL with 17-bit integer and 23-bit fractional feedback dividers and programmable loop filter
• Two pairs of configurable outputs: single differential LVDS/HSTL or two single-ended CMOS per pair
• Supports GR-1244 Stratum 3 stability in holdover mode and smooth reference switchover

Applications

• Network synchronization including synchronous Ethernet and SDH to OTN mapping/demapping
• SONET/SDH/OTN clocks up to 100 Gbps, including FEC
• Stratum 3 holdover, jitter cleanup, and phase transient control
• Wireless base station controllers and cable infrastructure

Procurement Notes

Verify the REEL7 suffix indicates reel packaging rather than tray packaging when sourcing components. Confirm that the specific revision matches the required datasheet Rev. C specifications. Ensure compatibility with the 40-LFCSP-VQ footprint during PCB layout. Check for moisture sensitivity level requirements prior to assembly processing.

Selection Notes

Select this component for applications requiring adaptive clock translation between multiple reference sources. The device supports both LVDS and HSTL differential outputs alongside CMOS options. Consider the AD9558 if four inputs and six outputs are required instead of the two inputs and four outputs provided here.

Part Context

This part belongs to the AD9557 series of clock translators designed for network synchronization. It serves as a core component for generating low-jitter clocks synchronized to external references. The device integrates on-chip EEPROM for storing power-up profiles and supports serial control via SPI or I2C interfaces.

Replacement Considerations

The AD9558 is the direct family member offering four inputs and six outputs. Verify pinout compatibility and register configuration differences before substituting.