ZL30644LDG1

Overview

The ZL30644LDG1 is a line card timing IC from the ZL3064x family, featuring up to five independent clock channels with any-to-any frequency conversion. It accepts up to 10 differential or single-ended inputs (1 kHz to 1250 MHz) and provides up to 10 differential or 20 CMOS outputs (0.5 Hz to 750 MHz). The device includes up to eight DPLLs for reference switching and holdover, achieving typical output jitter of 100 fsRMS at 156.25 MHz. It operates on 1.8V and 3.3V core supplies within a -40°C to +85°C range in a 64-lead VQFN package.

Feature Summary

• Up to five independent clock channels with any-to-any frequency conversion
• Up to 10 inputs and up to 20 CMOS or 10 differential outputs
• Up to 8 DPLLs with programmable bandwidth and hitless reference switching
• Typical output jitter of 100 fsRMS at 156.25 MHz

Applications

• Line card timing for SyncE and SyncE+1588 systems
• Wireless base stations including 3G, W-CDMA, 4G/LTE, LTE-A, and 5G
• Remote Radio Units (RRU) and wireless backhaul networks

Procurement Notes

Verify the specific ordering suffix against the manufacturer's current product brief to confirm pinout and feature availability. Confirm that the component meets RoHS standards and check for moisture sensitivity classification prior to surface mount assembly. Ensure the design supports the required SPI or I2C interface configuration.

Selection Notes

Select this model when five independent clock channels are required. Verify input frequency ranges do not exceed 1250 MHz for differential or 300 MHz for CMOS inputs. Ensure the application requires up to 20 single-ended outputs or 10 differential outputs. Check if the internal Flash memory configuration meets power-up requirements without external components.

Part Context

This part belongs to the ZL30641-ZL30645 series of line card timing ICs. These devices share a common architecture supporting up to five channels and ten inputs. The ZL30644 variant specifically provides the full complement of five channels and associated DPLL resources defined in the product brief.

Replacement Considerations

Other members of the ZL3064x family may serve as alternatives depending on channel count requirements. Verify that substitute parts support the same number of DPLLs and output configurations. Ensure compatibility with existing MiToDSync or MiToDBasic interface implementations.