Low Jitter, 2-Input Selectable 1:8 Universal-to-LVDS Buffer


Product details


Additive RMS jitter (Typ) (fs) 171 Output frequency (Max) (MHz) 800 Number of outputs 8 VCC out (V) 2.5 VCC core (V) 2.5 Output skew (ps) 45 Features 2:8 fanout, Universal inputs Operating temperature range (C) -40 to 85 Rating Catalog Output type LVDS Input type LVCMOS, LVDS, LVPECL open-in-new Find other Clock buffers

Package | Pins | Size

VQFN (RHD) 28 25 mm² 5 x 5 open-in-new Find other Clock buffers


  • 2:8 Differential Buffer
  • Low Additive Jitter: < 300-fs RMS in 10-kHz to 20-MHz
  • Low Output Skew of 45 ps (Maximum)
  • Universal Inputs Accept LVDS, LVPECL, and LVCMOS
  • Selectable Clock Inputs Through Control Pin
  • 8 LVDS Outputs, ANSI EIA/TIA-644A Standard Compatible
  • Clock Frequency: Up to 800 MHz
  • Device Power Supply: 2.375 V to 2.625 V
  • LVDS Reference Voltage, VAC_REF, Available for Capacitive Coupled Inputs
  • Industrial Temperature Range: –40°C to 85°C
  • Packaged in 5-mm × 5-mm, 28-Pin VQFN (RHD)
  • ESD Protection Exceeds 3-kV HBM, 1-kV CDM
    • Telecommunications and Networking
    • Medical Imaging
    • Test and Measurement Equipment
    • Wireless Communications
    • General-Purpose Clocking

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The CDCLVD1208 clock buffer distributes one of two selectable clock inputs (IN0 and IN1) to 8 pairs of differential LVDS clock outputs (OUT0 through OUT7) with minimum skew for clock distribution. The CDCLVD1208 can accept two clock sources into an input multiplexer. The inputs can either be LVDS, LVPECL, or LVCMOS.

The CDCLVD1208 is specifically designed for driving 50-Ω transmission lines. In case of driving the inputs in single-ended mode, the appropriate bias voltage, VAC_REF, must be applied to the unused negative input pin.

The IN_SEL pin selects the input which is routed to the outputs. If this pin is left open, it disables the outputs (static). The part supports a fail-safe function. The device incorporates an input hysteresis which prevents random oscillation of the outputs in the absence of an input signal.

The device operates in 2.5-V supply environment and is characterized from –40°C to 85°C (ambient temperature). The CDCLVD1208 is packaged in small, 28-pin, 5-mm × 5-mm VQFN package.

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Technical documentation

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* Datasheet CDCLVD1208 2:8 Low Additive Jitter LVDS Buffer datasheet (Rev. A) Oct. 31, 2016

Design & development

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Hardware development

The CDCLVD1204/CDCLVD2102 are high-performance, low-additive jitter clock buffers. They have two universal input buffers that support single-ended or differential clock inputs and are selectable through a control pin (for CDCLVD1204 only). The devices also feature on-chip bias generators that can (...)
  • Easy-to-use evaluation board to fan out low-phase noise clocks
  • Easy device setup
  • Fast configuration
  • Control pins configurable through jumpers
  • Board powered at 2.5 V
  • Single-ended or differential input clocks
  • Device supports four LVDS outputs, EVM supports two LVDS outputs

Design tools & simulation

SLLM090B.ZIP (14 KB) - IBIS Model

CAD/CAE symbols

Package Pins Download
VQFN (RHD) 28 View options

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