AD9553BCPZ

Overview

The AD9553BCPZ is a flexible clock translator based on an integer-N phase-locked loop (PLL). It accepts input frequencies from 8 kHz to 710 MHz and generates output frequencies up to 810 MHz. The device supports LVPECL, LVDS, and CMOS outputs, with CMOS limited to 200 MHz. It features pin-programmable frequency translation ratios for standard applications and arbitrary ratios via a 3-wire SPI interface. An on-chip VCO and crystal input capability enable holdover functionality. Powered by a single 3.3 V supply (3.135 V to 3.465 V), it operates within the -40°C to +85°C temperature range in a 32-LFCSP-WQ package.

Feature Summary

• Supports input frequencies from 8 kHz to 710 MHz and output frequencies up to 810 MHz.
• Provides two independently programmable outputs compatible with LVPECL, LVDS, or CMOS logic levels.
• Includes an on-chip VCO and crystal resonator input for holdover applications.
• Offers 15 preset input and 52 preset output frequency combinations via pin programming.
• Exceeds Telcordia GR-253-CORE jitter generation, transfer, and tolerance specifications.

Applications

• Passive optical networks (PON/EPON/GPON)
• SONET/SDH and Ethernet infrastructure
• Wireless base stations
• T1/E1 and BITS systems

Procurement Notes

Verify the component revision matches Rev. A specifications. Confirm the package type is 32-LFCSP-WQ (5x5 mm) with an exposed pad requiring ground connection. Ensure the operating environment stays within the specified -40°C to +85°C range and supply voltage limits of 3.135 V to 3.465 V.

Selection Notes

Select this device when flexible frequency translation between disparate clock standards is required. Use pin programming for fixed ratio applications like SONET or Ethernet. Utilize the SPI interface for custom frequency synthesis. Consider the low power consumption (<450 mW) and small footprint for space-constrained designs.

Part Context

The AD9553 serves as a cost-effective replacement for high-frequency VCXOs, OCXOs, and SAW resonators. It addresses timing needs in multi-service line cards where multiple clock domains must be synchronized. The device integrates reference selection, PLL synthesis, and output buffering into a single CMOS solution.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.

FAQ

What is the maximum frequency for CMOS outputs?

The CMOS output mode is limited to a maximum frequency of 200 MHz.

How does the device handle holdover applications?

The AD9553 supports holdover by allowing a 25 MHz crystal resonator to be connected across the XTAL pins.

Can the input-to-output frequency ratio be customized?

Yes, while 15 input and 52 output presets are available via pins, arbitrary ratios can be programmed using the 3-wire SPI interface.