Product details

Function Clock buffer, Differential Additive RMS jitter (typ) (fs) 50 Output frequency (max) (MHz) 2000 Number of outputs 8 Output supply voltage (V) 1.8, 2.5, 3.3 Core supply voltage (V) 1.8, 2.5, 3.3 Output skew (ps) 20 Features 2:8 fanout, Universal inputs Operating temperature range (°C) -40 to 105 Rating Catalog Output type LVDS Input type HCSL, LP-HCSL, LVCMOS, LVDS, LVPECL
Function Clock buffer, Differential Additive RMS jitter (typ) (fs) 50 Output frequency (max) (MHz) 2000 Number of outputs 8 Output supply voltage (V) 1.8, 2.5, 3.3 Core supply voltage (V) 1.8, 2.5, 3.3 Output skew (ps) 20 Features 2:8 fanout, Universal inputs Operating temperature range (°C) -40 to 105 Rating Catalog Output type LVDS Input type HCSL, LP-HCSL, LVCMOS, LVDS, LVPECL
VQFN (RHD) 28 25 mm² 5 x 5
  • High-performance LVDS clock buffer family with 2 inputs and 4 (2:4) or 8 (2:8) outputs.
  • Output frequency up to 2 GHz.
  • Supply voltage: 1.71 V to 3.465 V
  • Low additive jitter: < maximum 60 fs RMS in 12-kHz to 20-MHz at 156.25 MHz
    • Very low phase noise floor: –164 dBc/Hz (typical)

  • Very low propagation delay: < 575 ps maximum

  • Output skew: 20 ps maximum

  • Universal inputs accept LVDS, LVPECL, LVCMOS, LP-HCSL, HCSL and CML inputs
  • LVDS reference voltage, V AC_REF, available for capacitive-coupled inputs
  • Industrial temperature range: –40°C to 105°C
  • Packages available:
    • LMK1D1204: 3-mm × 3-mm, 16-pin VQFN (RGT)

    • LMK1D1208: 5-mm × 5-mm, 28-pin VQFN (RHD)

  • High-performance LVDS clock buffer family with 2 inputs and 4 (2:4) or 8 (2:8) outputs.
  • Output frequency up to 2 GHz.
  • Supply voltage: 1.71 V to 3.465 V
  • Low additive jitter: < maximum 60 fs RMS in 12-kHz to 20-MHz at 156.25 MHz
    • Very low phase noise floor: –164 dBc/Hz (typical)

  • Very low propagation delay: < 575 ps maximum

  • Output skew: 20 ps maximum

  • Universal inputs accept LVDS, LVPECL, LVCMOS, LP-HCSL, HCSL and CML inputs
  • LVDS reference voltage, V AC_REF, available for capacitive-coupled inputs
  • Industrial temperature range: –40°C to 105°C
  • Packages available:
    • LMK1D1204: 3-mm × 3-mm, 16-pin VQFN (RGT)

    • LMK1D1208: 5-mm × 5-mm, 28-pin VQFN (RHD)

The LMK1D120x clock buffer distributes one of two selectable clock inputs (IN0 and IN1) to 4 or 8 pairs of differential LVDS clock outputs (OUT0 through OUT7) with minimum skew for clock distribution. The LMK1D12x family can accept two clock sources into an input multiplexer. The inputs can either be LVDS, LVPECL, LP-HCSL, HCSL, CML or LVCMOS.

The LMK1D12x is specifically designed for driving 50-Ω transmission lines. In case of driving the inputs in single-ended mode, the appropriate bias voltage as shown in 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 (logic low). The part supports a fail-safe function. The device further incorporates an input hysteresis which prevents random oscillation of the outputs in the absence of an input signal.

The device operates in 1.8-V or 2.5-V or 3.3-V supply environment and is characterized from –40°C to 105°C (ambient temperature). The LMK1D12x package variant is shown in the table below:

The LMK1D120x clock buffer distributes one of two selectable clock inputs (IN0 and IN1) to 4 or 8 pairs of differential LVDS clock outputs (OUT0 through OUT7) with minimum skew for clock distribution. The LMK1D12x family can accept two clock sources into an input multiplexer. The inputs can either be LVDS, LVPECL, LP-HCSL, HCSL, CML or LVCMOS.

The LMK1D12x is specifically designed for driving 50-Ω transmission lines. In case of driving the inputs in single-ended mode, the appropriate bias voltage as shown in 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 (logic low). The part supports a fail-safe function. The device further incorporates an input hysteresis which prevents random oscillation of the outputs in the absence of an input signal.

The device operates in 1.8-V or 2.5-V or 3.3-V supply environment and is characterized from –40°C to 105°C (ambient temperature). The LMK1D12x package variant is shown in the table below:

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Technical documentation

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Type Title Date
* Data sheet LMK1D120x Low Additive Jitter LVDS Buffer datasheet (Rev. B) PDF | HTML 14 Jun 2023
Application note Sine to Square Wave Conversion Using Clock Buffers PDF | HTML 03 Sep 2024
Certificate LMK1D1208EVM EU Declaration of Conformity (DoC) 10 Aug 2021
EVM User's guide LMK1D1208 Low-Additive Jitter, Eight LVDS Outputs Clock Buffer Evaluation Board PDF | HTML 04 Aug 2021

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Evaluation board

LMK1D1208EVM — LMK1D1208 evaluation module for low jitter 2:8 LVDS fan-out buffer

LMK1D1208 is a high-performance, low additive jitter LVDS clock buffer with two differential inputs and eight LVDS outputs. This evaluation module (EVM) is designed to demonstrate the electrical performance of the LMK1D1208. This EVM can also be used to evaluate other 28-pin devices within the (...)
User guide: PDF | HTML
Not available on TI.com
Simulation model

LMK1DX IBIS Model (Rev. B)

SNAM251B.ZIP (67 KB) - IBIS Model
Design tool

PLLATINUMSIM-SW PLLatinum Sim Tool

PLLATINUMSIM-SW is a simulation tool that allows users to create detailed designs and simulations of our PLLatinum™ integrated circuits, which include the LMX series of phase-locked loops (PLLs) and synthesizers.

Supported products & hardware

Supported products & hardware

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Simulation tool

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PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
Package Pins CAD symbols, footprints & 3D models
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Ordering & quality

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