AD9522-5BCPZ

Overview

The AD9522-5BCPZ is a multi-output clock generator and distribution device from Analog Devices, housed in a 64-lead LFCSP package. It features an on-chip phase-locked loop (PLL) designed to interface with external voltage-controlled oscillators (VCOs) or VCXOs operating up to 2.4 GHz. The device provides twelve LVDS outputs, which can be reconfigured as twenty-four CMOS outputs for frequencies at or below 250 MHz. Key electrical specifications include a single 3.3 V power supply requirement, a programmable charge pump current range of 0.6 mA to 4.8 mA, and support for SPI and I²C serial control interfaces.

Feature Summary

• Supports external 3.3 V/5 V VCO/VCXO inputs up to 2.4 GHz
• Twelve LVDS outputs (800 MHz max) configurable as twenty-four CMOS outputs (250 MHz max)
• Low additive output jitter of 242 fs rms with channel-to-channel skew under 60 ps
• Glitch-free reference switchover and automatic holdover modes

Applications

• Clock generation for SONET, 10Ge, and 10G FC protocols
• Forward error correction (G.710) systems
• Clocking high-speed ADCs, DACs, DDSs, DDCs, DUCs, and MxFEs
• High-performance wireless transceivers and broadband infrastructure

Procurement Notes

Verify the specific suffix BCPZ against the manufacturer's ordering guide to confirm package type and tape/reel configuration. Ensure the design accommodates the required external VCO/VCXO components, as this variant lacks an integrated oscillator. Confirm that the application circuit supports the necessary external loop filter and biasing resistors specified in the datasheet for optimal PLL performance.

Selection Notes

Select the AD9522-5BCPZ when an external VCO or VCXO is preferred over an internal one, particularly for frequencies up to 2.4 GHz. This model is suitable for applications requiring low phase noise and subpicosecond jitter distribution. Consider the AD9520-5 if LVPECL drivers are required instead of LVDS. Ensure the system design accounts for the 64-lead LFCSP thermal requirements and the standard industrial temperature range of −40°C to +85°C.

Part Context

The AD9522-5 is part of the AD9522 family of clock generators, distinguished by its reliance on external oscillators rather than an integrated VCO. It shares functional similarities with other family members like the AD9522-1 and AD9522-2 but differs in VCO integration. The AD9520-5 serves as a pin-compatible alternative utilizing LVPECL drivers. This component is engineered for high-performance timing applications requiring flexible reference inputs and multiple output configurations.

Replacement Considerations

The AD9520-5 is a documented equivalent within the same family, offering LVPECL/CMOS drivers instead of LVDS/CMOS. Other AD9522 variants (e.g., AD9522-1, AD9522-2) integrate internal VCOs and may require different external component layouts. Verify register compatibility and driver types when substituting.