AD9549ABCPZ

Overview

The AD9549ABCPZ is a dual-input network clock generator and synchronizer in a 64-lead LFCSP package. It accepts reference inputs from 8 kHz to 750 MHz via CMOS, LVDS, or LVPECL interfaces. The device generates output clocks up to 725 MHz using HSTL (differential) and CMOS (single-ended) drivers. Key specifications include a digital PLL with programmable dividers, an integrated DDS with a 14-bit DAC, and holdover capabilities for maintaining timing during reference loss. Supply voltages range from 1.71 V to 3.465 V across analog and digital domains, operating within -40°C to +85°C.

Feature Summary

• Dual reference inputs supporting frequencies from 8 kHz to 750 MHz
• Integrated high-speed digitally controlled oscillator (DCO) core and direct digital synthesizer (DDS)
• Programmable digital loop filter with bandwidths from <1 Hz to ~100 kHz
• Output drivers providing differential HSTL (up to 725 MHz) and single-ended CMOS (up to 150 MHz)

Applications

• Network synchronization systems
• SONET/SDH clocks up to OC-192 including FEC
• Stratum 3/3E reference clock generation
• Wireless base station and controller timing

Procurement Notes

Verify the specific suffix 'A' against the manufacturer's current ordering guide to confirm availability and revision status. Confirm that the 64-LFCSP-VQ package dimensions match the target PCB footprint. Ensure power supply sequencing aligns with the datasheet recommendations for DVDD, AVDD, and DVDD_I/O pins to prevent latch-up or malfunction during startup.

Selection Notes

Select this component when dual-reference redundancy and low-jitter holdover are required. The integrated DDS allows for precise frequency tuning without external components. Verify that the input signal levels (CMOS, LVDS, LVPECL) match the available reference sources. Check if the maximum output frequency of 725 MHz meets the system requirements for the HSTL driver mode.

Part Context

The AD9549 belongs to Analog Devices' family of network clock synchronizers designed for telecommunications infrastructure. It serves as a central timing element for synchronous optical networks. The ABCPZ designation indicates the lead-free (Pb-Free) variant housed in the 64-lead Low Profile Chip Scale Package (LFCSP).

Replacement Considerations

Publicly confirmed substitute part numbers are not provided in the source material.