AD9545BCPZ-REEL7

Overview

The AD9545BCPZ-REEL7 is a quad-input, ten-output clock synchronizer and jitter cleaner featuring dual digital phase-locked loops (DPLLs). It supports physical layer clocks from 1 Hz to 750 MHz for frequency translation and noise reduction. The device includes two independent auxiliary numerically controlled oscillators (NCOs) with resolution below 1.37 × 10⁻¹² Hz, suitable for IEEE 1588 Version 2 servo feedback. It operates on a single 1.8 V supply within the −40°C to +85°C temperature range and is housed in a 48-lead LFCSP (7 mm × 7 mm) package.

Feature Summary

• Dual DPLL architecture synchronizes up to four input references to ten outputs with programmable loop filter bandwidths ranging from 10⁻⁴ Hz to 1850 Hz.
• Supports IEEE 1588 Version 2 via two auxiliary NCOs (1 Hz to 65,535 Hz) and provides continuous reference validation for frequency deviations as low as 50 ppb.
• Features five pairs of differential output pins configurable as LVDS, HCSL, or CML, or as ten single-ended outputs operating up to 500 MHz.
• Includes crosspoint mux interconnects, embedded signal support, and external EEPROM initialization for autonomous power-on configuration.

Applications

• GPS, PTP (IEEE 1588), and synchronous Ethernet (SyncE) jitter cleanup and synchronization
• Optical transport networks (OTN), synchronous digital hierarchy (SDH), and macro/small cell base stations
• Stratum 2, Stratum 3e, and Stratum 3 holdover, jitter cleanup, and phase transient control
• JESD204B support for analog-to-digital converter (ADC) and digital-to-analog converter (DAC) clocking

Procurement Notes

Verify that the ordering suffix REEL7 corresponds to the specific tape-and-reel packaging quantity defined by Analog Devices. Confirm the RoHS compliance status and lead times directly with authorized distributors, as availability may vary by region. Ensure the application environment remains within the specified -40°C to +85°C operating temperature range.

Selection Notes

Select this component when dual independent DPLLs are required for high-precision timing applications involving noisy references. The device is appropriate for systems needing simultaneous jitter cleaning and frequency translation across multiple output domains. Consider the 48-lead LFCSP footprint constraints and the need for a 1.8 V power supply during board layout.

Part Context

This part belongs to the AD9545 family of clock synchronizers designed for service provider packet networks. It complies with ITU-T G.8262, ITU-T G.812, and Telcordia GR-253 standards. The device integrates digitally controlled loop and holdover circuitry to maintain low jitter output signals even during reference input failures.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Evaluate alternative timing solutions based on specific pinout compatibility and functional requirements if direct replacement is necessary.

FAQ

What is the maximum output frequency supported by the AD9545?

The distribution clock outputs support frequencies up to 500 MHz, while the internal DPLLs can synchronize physical layer clocks up to 750 MHz.

How does the AD9545 handle reference input failures?

The digitally controlled loop and holdover circuitry continuously generate a low jitter output signal even when all reference inputs fail, ensuring uninterrupted operation.

Can the AD9545 be used for IEEE 1588 Version 2 applications?

Yes, it features two independent, programmable auxiliary NCOs with resolution < 1.37 × 10⁻¹² Hz, which are suitable for IEEE 1588 Version 2 servo feedback in PTP applications.