AD9578BCPZ-REEL7

Overview

The AD9578BCPZ-REEL7 is a dual PLL precision synthesizer designed for jitter attenuation and asynchronous clocking in high-performance telecommunications, networking, and data storage applications. It integrates two low-jitter PLLs with four programmable outputs, supporting frequencies up to 919 MHz with better than 0.1 ppb resolution. The device operates on a single supply voltage of 2.375 V to 2.625 V (2.5 V nominal) or 2.97 V to 3.63 V (3.3 V nominal). Typical rms jitter is below 410 fs (12 kHz to 20 MHz), achieving as low as 290 fs using integer synthesis. It features an SPI interface operating up to 100 MHz for write speeds and supports multiple output buffer formats including LVPECL, LVDS, HCSL, and LVCMOS.

Feature Summary

• Dual PLL architecture providing four independent programmable outputs up to 919 MHz
• Ultralow rms jitter performance: <300 fs rms (integer mode) and <405 fs rms (fractional mode)
• In-circuit programmable output buffers supporting LVPECL, LVDS, HCSL, and LVCMOS
• Fast SPI interface with write speeds up to 100 MHz and support for on-the-fly frequency changes

Applications

• FPGA-based jitter attenuators and low jitter PLLs
• Precision disciplined clocks and clock synthesizers
• Optical networking (OTN/SDH/SONET)
• Broadcast video systems (3G SDI, HD SDI, SDI)
• Networking and storage interfaces (Ethernet/SAS/Fibre Channel)

Procurement Notes

Verify the REEL7 suffix indicates tape and reel packaging when sourcing this component. Confirm the specific voltage grade matches the required system supply, as the device supports both 2.5 V and 3.3 V operation ranges. Ensure compatibility with the LFCSP-EP package dimensions during PCB layout. Check for any recent product change notices regarding die revisions that may affect electrical parameters.

Selection Notes

Select the AD9578BCPZ-REEL7 when designing systems requiring precise frequency synthesis with ultra-low phase noise. The choice between 2.5 V and 3.3 V operation depends on the target output driver requirements and system power constraints. Consider the available reference input options, such as fundamental mode crystals or external clock sources, to optimize jitter performance. Verify that the required output formats (LVPECL, LVDS, etc.) align with the destination device inputs.

Part Context

The AD9578 belongs to Analog Devices' family of precision clock synthesizers. It replaces multiple discrete components, including large clock ICs, PLLs, fanout buffers, crystal oscillators, and VCXOs. The BC part number variant typically denotes industrial temperature range operation (-25°C to +85°C) and specific manufacturing lot codes associated with the BCPZ lead-free LFCSP package.

Replacement Considerations

Direct pin-to-pin replacements within the same series include other AD9578 variants with different packaging or temperature grades. Cross-family alternatives may require significant schematic redesign due to differences in pinout, supply voltages, or control interfaces.