CDCLVP1204ARGTT

Overview

The CDCLVP1204ARGTT is a prototype, highly versatile, low additive jitter clock buffer manufactured by Texas Instruments. It functions as a 2:4 differential fanout buffer and multiplexer, generating four LVPECL output copies from one of two selectable inputs (LVPECL, LVDS, or LVCMOS/LVTTL). The device supports a maximum clock frequency of 2 GHz with a maximum propagation delay of 450 ps. It operates on a supply voltage range of 2.375 V to 3.6 V within an industrial temperature range of -40°C to +85°C. The component is housed in a 16-VFQFN package with an exposed pad.

Feature Summary

• 2:4 Differential Buffer with selectable clock inputs via IN_SEL terminal
• Universal inputs accepting LVPECL, LVDS, and LVCMOS/LVTTL signals
• Four LVPECL outputs with maximum clock frequency up to 2 GHz
• Very low additive jitter performance (<100 fs RMS in 10-kHz to 20-MHz offset range)

Applications

• Wireless Communications
• Telecommunications/Networking
• Medical Imaging Devices
• Test and Measurement Equipment

Procurement Notes

This specific part number, CDCLVP1204ARGTT, is designated as a PROTOTYPE grade component. Verify the availability status and intended use case for prototype hardware against production requirements. Ensure that the 16-VFQFN package dimensions and thermal pad soldering guidelines are strictly followed during assembly to maintain electrical and thermal performance.

Selection Notes

Select this component for applications requiring low skew (15 ps typical) and low additive jitter for high-speed clock distribution. The device supports both DC and AC coupling configurations for LVPECL outputs. Ensure the input signal amplitude meets the specified peak-to-peak voltage requirements for frequencies up to 2 GHz. The internal bias voltage generator is suitable for 3.3 V operation; external biasing is recommended for voltages below 3 V.

Part Context

The CDCLVP1204 series includes variants such as CDCLVP1204RGTR and CDCLVP1204RGTT, which differ primarily in packaging and reel specifications. The 'A' suffix in CDCLVP1204ARGTT typically denotes engineering samples or prototype units rather than standard production inventory. This distinguishes it from mass-produced versions used in final commercial products.

Replacement Considerations

For production replacements, consider the CDCLVP1204RGTR or CDCLVP1204RGTT. These variants share identical electrical characteristics and pinouts but are available in standard manufacturing quantities and packaging formats suitable for volume production.

FAQ

How is the input source selected?

The input source is selected via the IN_SEL control terminal. A logic low selects inputs INP0/INN0, while a logic high selects inputs INP1/INN1.

What is the recommended termination for LVPECL outputs?

The recommended termination is a 50 Ω resistor to (VCC – 2) V. For practical PCB implementation, a Thevenin equivalent circuit using resistive dividers is often used for both DC and AC-coupled configurations.

Can the device accept single-ended inputs?

Yes, the device can accept single-ended inputs. When driving inputs in single-ended mode, the LVPECL bias voltage (VAC_REF) must be applied to the unused negative input terminal.