Product details


Function Ultra-low jitter clock generator Number of outputs 8 Output frequency (Max) (MHz) 1000 Core supply voltage (V) 3.3 Output supply voltage (V) 3.3, 2.5, 1.8 Input type CML, LVDS, LVPECL, XTAL Output type CML, HCSL, LVCMOS, LVDS, LVPECL Operating temperature range (C) -40 to 85 Features Integrated EEPROM, I2C, Pin programmable Rating Catalog open-in-new Find other Clock generators

Package | Pins | Size

WQFN (RHS) 48 49 mm² 7 x 7 open-in-new Find other Clock generators


  • Ultra Low Noise, High Performance
    • Jitter: 100-fs RMS Typical, FOUT > 100 MHz
    • PSNR: –80 dBc, Robust Supply Noise Immunity
  • Flexible Device Options
    • Up to 8 AC-LVPECL, AC-LVDS, AC-CML, HCSL or LVCMOS Outputs, or Any Combination
    • Pin Mode, I2C Mode, and EEPROM Mode
    • 71-Pin Selectable Pre-Programmed Default Start-Up Options
  • Dual Inputs With Automatic or Manual Selection
    • Crystal Input: 10 to 52 MHz
    • External Input: 1 to 300 MHz
  • Frequency Margining Options
    • Fine Frequency Margining (±50 ppm Typical) Using Low-Cost Pullable Crystal Reference
    • Glitchless Coarse Frequency Margining (%) Using Output Dividers
  • Other Features
    • Supply: 3.3-V Core, 1.8-V, 2.5-V, 3.3-V Output Supply
    • Industrial Temperature Range (–40ºC to +85ºC)
    • Package: 7-mm × 7-mm 48-WQFN

All trademarks are the property of their respective owners.

open-in-new Find other Clock generators


The LMK03328 device is an ultra-low-noise clock generator with two fractional-N frequency synthesizers with integrated VCOs, flexible clock distribution and fanout, and pin-selectable configuration states stored in on-chip EEPROM. The device can generate multiple clocks for various multi-gigabit serial interfaces and digital devices, reduces BOM cost and board area, and improves reliability by replacing multiple oscillators and clock distribution devices. The ultra-low-jitter reduces bit error rate (BER) in high-speed serial links.

For each PLL, a differential/single-ended clock or crystal input can be selected as the PLL reference clock. The selected PLL reference input can be used to lock the VCO frequency at an integer or fractional multiple of the reference input frequency. The VCO frequency for the respective PLLs can be tuned between 4.8 GHz and 5.4 GHz. Both PLL/VCOs are equivalent in performance and functionality. Each PLL offers the flexibility to select a predefined or user-defined loop bandwidth, depending on the needs of the application. Each PLL has a post-divider that can be selected between divide-by 2, 3, 4, 5, 6, 7, or 8.

All the output channels can select the divided-down VCO clock from PLL1 or PLL2 as the source for the output divider to set the final output frequency. Some output channels can also independently select the reference input for PLL1 or PLL2 as an alternative source to be bypassed to the corresponding output buffers. The 8-bit output dividers support a divide range of 1 to 256 (even or odd), output frequencies up to 1 GHz, and output phase synchronization capability.

All output pairs are ground-referenced CML drivers with programmable swing that can be interfaced to LVDS or LVPECL or CML receivers with AC coupling. All output pairs can also be independently configured as HCSL outputs or 2x 1.8-V LVCMOS outputs. The outputs offer lower power at 1.8 V, higher performance and power supply noise immunity, and lower EMI compared to voltage-referenced driver designs (such as traditional LVDS and LVPECL drivers). Two additional 3.3-V LVCMOS outputs can be obtained through the STATUS pins. This is an optional feature in case of a need for 3.3-V LVCMOS outputs and device status signals are not needed.

The device features self start-up from on-chip programmable EEPROM or pre-defined ROM memory, which offers multiple custom device modes selectable through pin control and can eliminate the need for serial programming. The device registers and on-chip EEPROM settings are fully programmable via I2C-compatible serial interface. The device slave address is programmable in EEPROM and LSBs are settable with a 3-state pin.

The device provides two frequency margining options with glitch-free operation to support system design verification tests (DVT), such as standard compliance and system timing margin testing. Fine frequency margining (in ppm) can be supported by using a low-cost pullable crystal on the internal crystal oscillator (XO), and selecting this input as the reference to the PLL synthesizer. The frequency margining range is determined by the crystal’s trim sensitivity and the on-chip varactor range. XO frequency margining can be controlled through pin or I2C control for ease-of-use and high flexibility. Coarse frequency margining (in %) is available on any output channel by changing the output divide value through I2C interface, which synchronously stops and restarts the output clock to prevent a glitch or runt pulse when the divider is changed.

Internal power conditioning provide excellent power supply noise rejection (PSNR), reducing the cost and complexity of the power delivery network. The analog and digital core blocks operate from 3.3-V ± 5% supply and output blocks operate from 1.8-V, 2.5-V, 3.3-V ± 5% supply.

open-in-new Find other Clock generators

Technical documentation

= Top documentation for this product selected by TI
No results found. Please clear your search and try again. View all 10
Type Title Date
* Datasheet LMK03328 Ultra-Low Jitter Clock Generator With Two Independent PLLs, Eight Outputs, Integrated EEPROM datasheet (Rev. D) Apr. 20, 2018
Application notes Clocking for Medical Ultrasound Systems (Rev. A) Sep. 30, 2020
Technical articles Can a clock generator act as a jitter cleaner? Mar. 23, 2017
Technical articles The five benefits of multiple-personality clocking devices May 17, 2016
Technical articles Complete clock-tree solutions that make a hardware designer’s life easier Mar. 09, 2016
Application notes Clocking High Speed Serial Links with LMK033X8 (Rev. A) Jan. 07, 2016
Application notes Frequency Margining Using TI High-Performance Clock Generators (Rev. A) Dec. 12, 2015
Technical articles How to select an optimal clocking solution for your FPGA-based design Dec. 09, 2015
User guides LMK03328EVM CodeLoader Software User's Guide Aug. 25, 2015
User guides LMK03328EVM User's Guide Aug. 25, 2015

Design & development

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

Hardware development

document-generic User guide

The LMK03328EVM evaluation module provides a complete clocking platform to evaluate the 100-fs RMS jitter performance and pin-/software-configuration modes and features of the Texas Instruments LMK03328 Ultra-Low-Jitter Clock Generator with Dual PLLs, 8 outputs, 2 inputs, and integrated EEPROM.

The (...)

  • Two independent clock domains in Dual PLL operation for clocking multiple interface standards/protocols
  • Up to 8 pairs of Differential or 16 LVCMOS (1.8V) clock outputs, or any combination of both
  • Flexible device pin modes offer multiple start-up register configurations (jumper selectable)
  • Clock (...)

Software development

Texas Instruments Clocks and Synthesizers (TICS) Pro Software
TICSPRO-SW The TICS Pro software is used to program the evaluation modules (EVMs) for device numbers with these prefixes: CDC, LMK and LMX. These devices include PLLs and voltage-controlled oscillators (PLL+VCO), synthesizers and clocking devices.
  • Program EVMs through the USB2ANY Interface Adaptor or onboard USB interface.
  • Export programming configurations for use in end application.
SNAC069.ZIP (2 KB)

Design tools & simulation

SNAM177B.ZIP (88 KB) - IBIS Model
PSpice® for TI design and simulation tool
PSPICE-FOR-TI — 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 (...)
  • Leverages Cadence PSpice Technology
  • Preinstalled library with a suite of digital models to enable worst-case timing analysis
  • Dynamic updates ensure you have access to most current device models
  • Optimized for simulation speed without loss of accuracy
  • Supports simultaneous analysis of multiple products
  • (...)

CAD/CAE symbols

Package Pins Download
WQFN (RHS) 48 View options

Ordering & quality

Recommended products may have parameters, evaluation modules or reference designs related to this TI product.

Support & training

TI E2E™ forums with technical support from TI engineers

Content is provided "as is" by TI and community contributors and does not constitute TI specifications. See terms of use.

If you have questions about quality, packaging or ordering TI products, see TI support. ​​​​​​​​​​​​​​


Related videos