AD9549ABCPZ-REEL7

Overview

The AD9549ABCPZ-REEL7 is a dual-input network clock generator and synchronizer manufactured by Analog Devices Inc. It operates within an industrial temperature range of −40°C to +85°C and is housed in a 64-lead LFCSP-VQ (9x9 mm) package. The device accepts reference inputs from 8 kHz to 750 MHz, supporting CMOS, LVDS, and LVPECL formats. It provides HSTL outputs up to 725 MHz and single-ended CMOS outputs for frequencies below 150 MHz. Supply voltages include DVDD at 1.71 V to 1.89 V and AVDD3 at 3.135 V to 3.465 V.

Feature Summary

• Dual reference inputs with auto/manual holdover and switchover modes
• Integrated high-speed digitally controlled oscillator (DCO) core and direct digital synthesizer (DDS)
• Programmable digital loop filter with bandwidths ranging from <1 Hz to ~100 kHz
• Low jitter clock doubler for output frequencies exceeding 400 MHz

Applications

• Network synchronization systems
• SONET/SDH clocks up to OC-192, including FEC
• Stratum 3/3E reference clocks
• Wireless base station controllers
• Cable infrastructure applications

Procurement Notes

Verify the REEL7 suffix indicates reel packaging containing 750 units per manufacturer standard. Confirm the specific revision level against the latest Analog Devices documentation to ensure compatibility with design requirements. Check for moisture sensitivity levels and storage conditions prior to assembly.

Selection Notes

Select this component when dual independent reference inputs are required for high-stability network synchronization. Ensure the system supports the necessary supply voltage partitions (1.8 V analog/digital and 3.3 V I/O). Verify that the target application frequency falls within the supported ranges for either the HSTL or CMOS output drivers.

Part Context

This part belongs to the AD9549 series of clock generators. It serves as a specialized solution for generating clean, synchronized clocks from noisy external references using digital PLL technology and holdover capabilities. It is distinct from simpler clock buffers or basic synthesizers due to its advanced network synchronization features.

Replacement Considerations

Consult the official Analog Devices ordering guide for confirmed substitute part numbers. Do not assume functional equivalence with other models in the family without verifying pinout and register compatibility.