CTSLV310QG

Clock Buffers, Drivers Overview

The CTSLV310 is a configurable ultra-low phase noise buffer and translator IC from CTS-Frequency Controls, designed for clock distribution applications. It supports LVPECL or LVDS outputs with selectable ÷1 or ÷2 division ratios and active high/low enable polarity. The device operates on a 2.375V to 3.6V supply and achieves a maximum frequency of 1.6 GHz in divide-by-two mode. Key electrical specifications include a phase noise floor of -167 dBc/Hz for LVPECL and -165 dBc/Hz for LVDS at a 1 MHz offset. Integrated jitter is specified at 26 fs for LVPECL and 36 fs for LVDS over a 12 kHz to 20 MHz bandwidth at a 155 MHz carrier. The component is available in SON8 and MSOP8 surface-mount packages.

Clock Buffers, Drivers Feature Summary

• Configurable output interface supporting both LVPECL and LVDS standards via static pin control.
• Ultra-low phase noise performance: -167 dBc/Hz (LVPECL) and -165 dBc/Hz (LVDS).
• Integrated frequency divider functionality offering ÷1 or ÷2 operation modes.
• Operates within a 2.375V to 3.6V supply voltage range with low power consumption.

Clock Buffers, Drivers Applications

• Converting crystal or SAW oscillator signals to LVPECL/LVDS formats.
• High-performance clock distribution networks requiring low jitter.
• Test and measurement equipment utilizing ultra-low phase noise requirements.

Clock Buffers, Drivers Procurement Notes

Verify the specific package variant required for the design, as the CTSLV310 is offered in SON8 (suffix QG) and MSOP8 (suffix TG). Confirm that the configuration pins b-0 and b-1 are correctly tied to logic levels to establish the desired output type and division ratio before integration. Ensure input signal swing meets the minimum 0.2 VPP recommendation to maintain specified phase noise performance.

Clock Buffers, Drivers Selection Notes

Select the CTSLV310 when both LVPECL and LVDS compatibility is needed within a single footprint. Choose the ÷2 mode if operating frequencies up to 1.6 GHz are required, noting that the ÷1 mode is limited to 1 GHz. Consider the MSOP8 package for standard PCB layouts or SON8 for compact designs. Verify that the application can accommodate the internal 10kΩ input bias resistor or provide appropriate AC coupling.

Clock Buffers, Drivers Part Context

The CTSLV310 belongs to CTS-Frequency Controls' family of ultra-low phase noise clock buffers. It serves as a flexible solution for designers needing to translate oscillator outputs into differential formats without adding significant jitter. Unlike fixed-output buffers, its configurability reduces bill-of-materials complexity by supporting multiple interface standards through hardware pin selection.

Clock Buffers, Drivers Replacement Considerations

Public confirmed substitute part numbers are not provided in the source documentation. Designers should evaluate alternative configurable LVPECL/LVDS translators based on package compatibility and phase noise specifications if this component is unavailable.

Clock Buffers, Drivers FAQ

How is the output format and division ratio configured?

Configuration is determined by the static voltage levels on pins b-0 and b-1. Table 1 in the datasheet details the eight possible combinations for selecting LVPECL or LVDS outputs, ÷1 or ÷2 division, and enable polarity.

What is the maximum input frequency supported?

The maximum input frequency is 1 GHz in ÷1 mode and 1.6 GHz in ÷2 mode.

How should the LVPECL outputs be terminated?

Outputs should be terminated identically using external 50Ω resistors to match LVPECL levels. Both Q and QN outputs must be terminated symmetrically to prevent waveform distortion and circulating current, even if only one output is used.