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LMK1D1208

ACTIVE

8-channel output LVDS 1.8-V, 2.5-V, and 3.3-V buffer

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Data sheet

LMK1D1208

ACTIVE
Data sheet Order now

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
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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

Products
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Clock buffers
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Clock generators
LMK03318 — Ultra-low jitter clock generator family with single PLL LMK03328 — Ultra-low jitter clock generator family with two independent PLLs LMK03806 — Ultra-low jitter clock generator with 14 outputs
IQ demodulators
LMX8410L — High-Performance Mixer With Integrated Synthesizer
Clock jitter cleaners
LMK04208 — Ultra low-noise clock jitter cleaner with 6 programmable outputs LMK04368-EP — Enhanced product ultra-low-noise 3.2-GHz JESD204C jitter cleaner LMK04714-Q1 — Automotive, ultra low-noise 3.2-GHz, JESD204B and JESD204C dual-loop clock jitter cleaner LMK04803 — Low-noise clock jitter cleaner with dual cascaded PLLs and integrated 1.9-GHz VCO LMK04805 — Low-noise clock jitter cleaner with dual cascaded PLLs and integrated 2.2-GHz VCO LMK04806 — Low-noise clock jitter cleaner with dual cascaded PLLs and integrated 2.5-GHz VCO LMK04808 — Low-noise clock jitter cleaner with dual loop PLLs and integrated 2.9-GHz VCO LMK04816 — Three input low-noise clock jitter cleaner with dual loop PLLs LMK04821 — Ultra low jitter synthesizer and jitter cleaner with JESD204B support LMK04826 — Ultra low-noise JESD204B compliant clock jitter cleaner with integrated 1840 to1970-MHz VCO0 LMK04828 — Ultra low-noise JESD204B compliant clock jitter cleaner with integrated 2370 to 2630-MHz VCO0. LMK04828-EP — Ultra low-noise JESD204B compliant clock jitter cleaner with temperature range -55 to 105c LMK04832 — Ultra-low-noise, 3.2-GHz, 15-output, JESD204B clock jitter cleaner with dual loop LMK04832-SEP — Radiation-tolerant, 30-krad, ultra-low-noise, 3.2-GHz 15-output JESD204C clock jitter cleaner LMK04832-SP — Radiation-hardened-assured (RHA), ultra-low-noise, 3.2-GHz, 15-output clock jitter cleaner LMK04906 — Ultra low noise clock jitter cleaner/multiplier with 6 programmable outputs
Clock network synchronizers
LMK05028 — Low-jitter dual-channel network synchronizer clock LMK05318 — Ultra-low jitter single channel network synchronizer clock with BAW LMK05318B — Ultra-low jitter single channel network synchronizer clock with BAW LMK05318B-Q1 — Automotive ultra-low jitter network synchronizer and clock generator LMK5B33216 — 16-output, three DPLL and APLL, network synchronizer with integrated 2.5-GHz bulk-acoustic-wave VCO LMK5B33414 — 14-output, three DPLL and APLL, network synchronizer with integrated 2.5-GHz bulk-acoustic-wave VCO LMK5C33216 — Ultra-low jitter clock synchronizer with JESD204B for wireless communications with BAW LMK5C33216A — Three DPLL, three APLL, two-input and 16-output network synchronizer with JESD204B/C and BAW VCO
Hardware development
Evaluation board
LMK04832EVM — LMK04832 JESD204B Clock Jitter Cleaner/Clock Generator/Distribution Evaluation Module LMX2571EPEVM — LMX2571-EP evaluation module for 1.34-GHz, low-power, extreme-temperature RF synthesizer LMX2594PSEVM — LMX2594 evaluation module for 15-GHz RF synthesizer with multiple-device phase synchronization XMICR-3P-LMX2492 — LMX2492 X-MWblock evaluation modules XMICR-3P-LMX2572 — LMX2572 X-MWblock evaluation modules XMICR-3P-LMX2592 — LMX2592 X-MWblock evaluation modules XMICR-3P-LMX2594 — LMX2594 X-MWblock evaluation modules XMICR-3P-LMX2595 — LMX2595 X-MWblock evaluation modules
Software
Application software & framework
TICSPRO-SW — Texas Instruments Clocks and Synthesizers (TICS) Pro Software
IDE, configuration, compiler or debugger
CODELOADER — CodeLoader Software for device register programming
Support software
LMX9830-SW — LMX9830 Application Notes, Software, and Tools LMX9838-SW — LMX9838 Application Notes, Software, and Tools
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Simulation tool

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

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 (...)
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