ZL30241LDG1

Overview

The ZL30241LDG1 is a single-channel precision universal clock generator and Numerical Control Oscillator (NCO) manufactured by Microchip Technology. It integrates one Phase-Locked Loop (PLL) capable of integer, fractional, and ratio modes to synthesize two independent output frequencies ranging from 12 MHz to 914 MHz. The device supports input references including crystals (22–54 MHz), crystal oscillators, or differential/single-ended signals up to 864 MHz. Outputs are configurable for LVDS, LVPECL, HCSL, or LVCMOS formats. Key electrical specifications include an RMS jitter of up to 275 fs in integer mode and 400 fs in fractional mode, with NCO accuracy below 0.1 ppb. It operates within a temperature range of -40°C to +85°C and is housed in a 48-pin QFN package measuring 7x7 mm.

Feature Summary

• Single PLL architecture supporting integer, fractional, and ratio modes for flexible frequency synthesis.
• Ultra-low jitter performance: up to 275 fs RMS (integer mode) and 400 fs RMS (fractional mode).
• Dual programmable outputs with independent format selection (LVDS, LVPECL, HCSL, LVCMOS).
• Factory programmable configuration with dynamic SPI control for register updates.

Applications

• Clocking for Network Processing Units (NPUs) and FPGAs.
• Timing for 10G CDRs, high-speed ADCs, and PCIe interface devices.
• Ethernet switches and PHYs timing solutions.
• Optical, storage, networking, and broadcast video applications.

Procurement Notes

Verify the ordering suffix against the specific packaging requirement. The ZL30241LDG1 variant is supplied in a 48-pin QFN tray. Confirm that the application design accommodates the specified operating voltage ranges and thermal characteristics for the QFN-48 package before finalizing procurement.

Selection Notes

Select this component when a single PLL with dual independent outputs is required for high-frequency synthesis up to 914 MHz. Ensure the input reference source meets the phase noise requirements, as the PLL tracks reference noise below the loop bandwidth. Verify that the target output format (LVDS/LVPECL/HCSL/LVCMOS) aligns with the load requirements and that the system can support the necessary SPI interface for configuration.

Part Context

The ZL30241 belongs to the ZL302xx series of precision clock generators. It is designed to replace discrete clock generation solutions by integrating the PLL, VCO, and output buffers into a single chip. The device supports factory-programmed defaults, allowing it to generate correct clock signals immediately at power-up without external microcontroller intervention.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Evaluate compatibility based on pinout, voltage levels, and jitter specifications if considering alternative single-PLL clock generators.

FAQ

What are the supported input reference types for the ZL30241?

The device accepts fundamental crystals (22–54 MHz), crystal oscillators (22–180 MHz), or external reference signals (single-ended or differential, up to 864 MHz).

How does the Ratio Mode function in the ZL30241?

Ratio mode enables frequency translation of the form N + X/Y, which is ideal for FEC rate translation applications like SONET and OTN. It uses a feedback divider structure defined by parameters A, B, C, and D.

Can the output format be changed dynamically?

Yes, each output buffer can be independently configured via SPI registers to support LVDS, LVPECL, HCSL, or LVCMOS formats after power-up.