ZL30662LFG7

Overview

The ZL30662LFG7 is a dual-channel line card timing IC from Microchip Technology, housed in an 80-lead LGA package. It features two DPLL channels and supports up to ten differential or CMOS inputs ranging from 1kHz to 900MHz. The device generates up to eighteen output clocks with frequencies from less than 1Hz to 1045MHz. Key electrical characteristics include input jitter monitoring, per-DPLL phase adjustment with 1ps resolution, and output jitter typically below 1ps RMS for fractional dividers. It operates within a temperature range of -40°C to +85°C.

Feature Summary

• Dual DPLL Channels: Supports programmable bandwidth (14Hz to 470Hz), hitless reference switching, and high-resolution holdover averaging.
• Flexible Input/Output: Accepts up to 10 inputs (1kHz–900MHz) and provides up to 18 outputs (<1Hz–1045MHz) with configurable LVDS, LVPECL, HCSL, or CMOS formats.
• High Precision Timing: Features 1ps resolution for per-input, per-DPLL, and per-output phase adjustments, along with input-to-output alignment under 200ps.
• Integrated Synthesizers: Includes two low-jitter synthesizers (Synth1, Synth2) and one general-purpose synthesizer (Synth0) requiring no external VCXO or loop filter components.

Applications

• Synchronous Ethernet (SyncE) and SyncE+1588 line cards
• SONET/SDH and OTN systems
• Wireless base station timing infrastructure

Procurement Notes

Verify the specific ordering suffix LFG7 confirms the 80-lead LGA tray packaging and NiAu finish. Confirm that the internal Flash memory configuration matches the target system requirements, as the device performs automatic self-configuration at power-up. Ensure the local oscillator frequency falls within the specified ranges (23.75-25MHz, 47.5-50MHz, or 114.285-125MHz) for optimal performance.

Selection Notes

Select the ZL30662LFG7 when exactly two DPLL channels are required for reference clock management. Compare against the ZL30661 (single channel) if only one DPLL is needed, or the ZL30663 (three channels) if additional synchronization paths are necessary. Consider the maximum CMOS input frequency limit of 180MHz versus the 900MHz differential limit when designing input interfaces.

Part Context

This component belongs to the ZL3066x family of line card timing ICs, which also includes the single-channel ZL30661 and the three-channel ZL30663. All variants share identical pinouts and core functionality but differ in the number of integrated Digital Phase-Locked Loops (DPLLs). The ZL30662 specifically provides a balance between channel count and resource utilization for dual-reference applications.

Replacement Considerations

Direct functional substitutes within the same package and feature set include the ZL30661LFG7 (1-channel) and ZL30663LFG7 (3-channel). Verify that the replacement variant meets the specific DPLL count requirements of the design without necessitating PCB layout changes.

FAQ

What is the maximum frequency supported by CMOS inputs?

CMOS inputs support a maximum frequency of 180MHz, while differential inputs can handle frequencies up to 900MHz.

Does the ZL30662 require external components for the voltage-controlled oscillator (VCXO)?

No, the device features an easy-to-configure design that requires no external VCXO or loop filter components.

How many general-purpose I/O pins are available on this device?

The ZL30662LFG7 provides seven general-purpose I/O (GPIO) pins with various status and control options.