CTSLV353QG

Clock Buffers, Drivers Overview

The CTSLV353 is a sine wave/CMOS to LVPECL buffer and translator optimized for very low phase noise (-165dBc/Hz). It converts crystal or SAW-based oscillators into LVPECL outputs with up to 800MHz bandwidth. The device features selectable ÷1 or ÷2 output division ratios and configurable enable logic (active high or low). It operates on a single 3.0V to 3.6V supply, drawing a typical current of 35mA. The component is housed in an 8-QFN (1.5x1.5mm) surface-mount package and supports an operating temperature range of -40°C to +85°C.

Clock Buffers, Drivers Feature Summary

• Low Phase Noise: Optimized for -165dBc/Hz at 1MHz offset.
• Selectable Division Ratio: Configurable via DIV_SEL pin for ÷1 or ÷2 modes.
• Configurable Enable Logic: Selectable active high or active low via EN_SEL pin.
• Wide Bandwidth: Supports input frequencies up to 800MHz.

Clock Buffers, Drivers Applications

• Converting crystal or SAW oscillators to LVPECL outputs.
• High-speed clock distribution systems.
• Telecommunications infrastructure requiring low jitter.

Clock Buffers, Drivers Procurement Notes

Verify the specific package variant required for the design; the QG suffix denotes the 8-QFN package while PG denotes SON8. Confirm that the application circuit provides proper AC coupling and termination resistors to meet AC specifications. Ensure the power supply voltage remains within the 3.0V to 3.6V range during operation.

Clock Buffers, Drivers Selection Notes

Select the CTSLV353 when LVPECL outputs are required from CMOS or sine wave inputs with bandwidths up to 800MHz. Choose this part over the CTSLV363 if lower cost or specific ÷1/÷2 selection logic is preferred, noting the CTSLV363 offers higher bandwidth (≥1GHz). Verify that the 1.5x1.5mm QFN footprint fits the PCB layout constraints.

Clock Buffers, Drivers Part Context

The CTSLV353 belongs to the CTSLV35x family of buffers and translators. It shares functional similarities with the CTSLV351 (fixed ÷1) and CTSLV363 (higher bandwidth), offering designers flexibility in division ratio and enable logic configuration within the same low-phase-noise architecture.

Clock Buffers, Drivers Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.

Clock Buffers, Drivers FAQ

How is the divide ratio selected?

The divide ratio is selected using the DIV_SEL pin. A Low or NC state configures the device for ÷1 mode, while a High state configures it for ÷2 mode.

What is the recommended input signal amplitude?

For clock applications, an input signal of at least 750mVPP ensures the device meets AC specifications. The maximum recommended input signal is VDD VPP.

How should the LVPECL outputs be terminated?

Outputs should be terminated identically to avoid waveform distortion. Standard termination uses two 50Ω resistors connected between the outputs and VDD-2.0V.