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LMK3H2104

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4-output, PCIe Gen 1 to Gen 7 compliant, BAW reference-less clock generator, clock mux and buffer

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Data sheet

LMK3H2104

ACTIVE
Data sheet Order now

Product details

Function Clock buffer, Clock generator, Mux buffer Number of outputs 4 Output frequency (max) (MHz) 400 Core supply voltage (V) 1.8, 2.5, 3.3 Output supply voltage (V) 1.8, 2.5, 3.3 Output type LP-HCSL, LVCMOS, LVDS Operating temperature range (°C) -40 to 85 Features I2C, One-Time Programmable (OTP) memory, Pin programmable, Serial interface Rating Catalog
Function Clock buffer, Clock generator, Mux buffer Number of outputs 4 Output frequency (max) (MHz) 400 Core supply voltage (V) 1.8, 2.5, 3.3 Output supply voltage (V) 1.8, 2.5, 3.3 Output type LP-HCSL, LVCMOS, LVDS Operating temperature range (°C) -40 to 85 Features I2C, One-Time Programmable (OTP) memory, Pin programmable, Serial interface Rating Catalog
VQFN (RGE) 24 16 mm² 4 x 4
  • Integrated BAW resonator
    • No need for external XTAL/XO
  • Flexible output frequency
    • 2 fraction output dividers (FOD), individual channel dividers
    • Up to 400MHz output frequency
  • Flexible output format
    • 1.2/1.8/2.5/3.3V LVCMOS
    • DC- or AC-coupled LVDS
    • LP-HCSL with programmable swing. LVPECL, CML and other formats can be derived from LP-HCSL
  • Very low jitter
    • 61fs max PCIe Gen 5 CC with SSC jitter
    • 36.4fs max PCIe Gen 6 CC with SSC jitter
    • 25.5fs max PCIe Gen 7 CC with SSC jitter
  • PCIe Gen 1 to Gen 7 compliant
  • Configurable SSC
    • Programmable -0.05% to -3% down spread and ±0.025% to ±1.5% center spread, or preset -0.1%, -0.25%, -0.3% and -0.5% down spread
  • 1 input (LMK3H2104) that can be bypassed to any output
  • 5ms max startup time
  • Fail-safe input pins can be pulled high when device power is off
  • Flexible power supply
    • Each VDD pin can be independently connected to = 1.8, 2.5 or 3.3V
    • Each VDDO pin can be independently connected set to 1.8, 2.5 or 3.3V
  • -40 to 105°C ambient temperature
  • Integrated BAW resonator
    • No need for external XTAL/XO
  • Flexible output frequency
    • 2 fraction output dividers (FOD), individual channel dividers
    • Up to 400MHz output frequency
  • Flexible output format
    • 1.2/1.8/2.5/3.3V LVCMOS
    • DC- or AC-coupled LVDS
    • LP-HCSL with programmable swing. LVPECL, CML and other formats can be derived from LP-HCSL
  • Very low jitter
    • 61fs max PCIe Gen 5 CC with SSC jitter
    • 36.4fs max PCIe Gen 6 CC with SSC jitter
    • 25.5fs max PCIe Gen 7 CC with SSC jitter
  • PCIe Gen 1 to Gen 7 compliant
  • Configurable SSC
    • Programmable -0.05% to -3% down spread and ±0.025% to ±1.5% center spread, or preset -0.1%, -0.25%, -0.3% and -0.5% down spread
  • 1 input (LMK3H2104) that can be bypassed to any output
  • 5ms max startup time
  • Fail-safe input pins can be pulled high when device power is off
  • Flexible power supply
    • Each VDD pin can be independently connected to = 1.8, 2.5 or 3.3V
    • Each VDDO pin can be independently connected set to 1.8, 2.5 or 3.3V
  • -40 to 105°C ambient temperature

LMK3H2104 is a BAW-based clock generator that does not require any external XTAL or XO. The device can be used as PCIe clock generator or general purpose clock generator. The 2 FODs (Fractional Output Divider) provide frequency flexibility, low power and low jitter at the same time.

LMK3H2104 has up to 4 differential outputs plus 2 LVCMOS outputs or up to 10 LVCMOS outputs. The device also has one clock input. The clock input provides clock multiplexing and buffering ability. Each output bank can independently select any clock source.

The GPI and GPIO pins provide additional control flexibility. These pins can be configured as individual OE, grouped OE, I2C address selection, OTP page selection, PWRGD/PWRDN#, status output and other functions.

The device supports one-time programmable (OTP) non-volatile memory which can be customized and factory preprogrammed.

LMK3H2104 is a BAW-based clock generator that does not require any external XTAL or XO. The device can be used as PCIe clock generator or general purpose clock generator. The 2 FODs (Fractional Output Divider) provide frequency flexibility, low power and low jitter at the same time.

LMK3H2104 has up to 4 differential outputs plus 2 LVCMOS outputs or up to 10 LVCMOS outputs. The device also has one clock input. The clock input provides clock multiplexing and buffering ability. Each output bank can independently select any clock source.

The GPI and GPIO pins provide additional control flexibility. These pins can be configured as individual OE, grouped OE, I2C address selection, OTP page selection, PWRGD/PWRDN#, status output and other functions.

The device supports one-time programmable (OTP) non-volatile memory which can be customized and factory preprogrammed.
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Technical documentation

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Type Title Date
* Data sheet LMK3H2104 4-Output PCIe Gen 1-7 Compliant Low jitter General Purpose BAW Clock Generator datasheet PDF | HTML 28 Aug 2025
User guide LMK3H2104 Register Map PDF | HTML 21 Aug 2025
Certificate LMK3H2104EVM EU Declaration of Conformity (DoC) 22 Jul 2025

Design & development

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

Application software & framework

LMK3H2108-DESIGN — LMK3H210x configuration GUI software

Software provides configuration support for LMK3H2104 and LMK3H2108 devices
Supported products & hardware

Supported products & hardware

Products
Clock generators
LMK3H2104 — 4-output, PCIe Gen 1 to Gen 7 compliant, BAW reference-less clock generator, clock mux and buffer
Request
Application software & framework

LMK3H2108-GUI — Programming GUI for the public release of the LMK3H2108 devices.

The TICS Pro 2 software is required for interfacing with the LMK3H210x family of devices. This allows for handling of the register paging functionality automatically.
Supported products & hardware

Supported products & hardware

Products
Clock generators
LMK3H2104 — 4-output, PCIe Gen 1 to Gen 7 compliant, BAW reference-less clock generator, clock mux and buffer
Request
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
Clock buffers
CDCDB2000 — DB2000QL compliant 20-output clock buffer for PCIe® Gen 1 to Gen 5 CDCDB400 — 4-output clock buffer for PCIe® Gen 1 to Gen 6 CDCDB800 — 8-output clock buffer for PCIe® Gen 1 to Gen 6 CDCDB803 — 8-output clock buffer for PCIe® Gen 1 to Gen 6 with selectable SMBus addresses CDCLVC1102 — Low jitter, 1:2 LVCMOS fan-out clock buffer CDCLVC1103 — Low jitter, 1:3 LVCMOS fan-out clock buffer CDCLVC1104 — Low jitter, 1:4 LVCMOS fan-out clock buffer CDCLVC1106 — Low jitter, 1:6 LVCMOS fan-out clock buffer CDCLVC1108 — Low jitter, 1:8 LVCMOS fan-out clock buffer CDCLVC1110 — Low jitter, 1:10 LVCMOS fan-out clock buffer CDCLVC1112 — Low jitter, 1:12 LVCMOS fan-out clock buffer CDCLVC1310 — Universal input, 10-output low impedance LVCMOS buffer CDCLVD110A — 1-to-10 LVDS clock buffer up to 1100-MHz with minimum skew for clock distribution CDCLVD1204 — Low jitter, 2-input selectable 1:4 universal-to-LVDS buffer CDCLVD1208 — Low jitter, 2-input selectable 1:8 universal-to-LVDS buffer CDCLVD1212 — Low jitter, 2-input selectable 1:12 universal-to-LVDS buffer CDCLVD1213 — Low jitter, 1:4 universal-to-LVDS buffer with selectable output divider CDCLVD1216 — Low jitter, 2-input selectable 1:16 universal-to-LVDS buffer CDCLVD2102 — Low jitter, dual 1:2 universal-to-LVDS buffer CDCLVD2104 — Low jitter, dual 1:4 universal-to-LVDS buffer CDCLVD2106 — Low jitter, dual 1:6 universal-to-LVDS buffer CDCLVD2108 — Low jitter, dual 1:8 universal-to-LVDS buffer CDCLVP110 — 1:10 LVPECL/HSTL to LVPECL clock driver CDCLVP1102 — Low jitter 1:2 universal-to-LVPECL buffer CDCLVP111 — 1:10 LVPECL buffer with selectable input CDCLVP111-EP — HiRel, 1:10 LVPECL buffer with selectable input CDCLVP111-SEP — Radiation-tolerant 1:10 LVPECL high-speed clock buffer with selectable input clock driver CDCLVP111-SP — 1:10 high speed clock buffer with selectable input clock driver CDCLVP1204 — Low-jitter, two-input, selectable 1:4 universal-to-LVPECL buffer CDCLVP1208 — Low jitter, 2-input selectable 1:8 universal-to-LVPECL buffer CDCLVP1212 — Low jitter, 2-input selectable 1:12 universal-to-LVPECL buffer CDCLVP1216 — Low jitter, 2-input selectable 1:16 universal-to-LVPECL buffer CDCLVP2102 — Low jitter, dual 1:2 universal-to-LVPECL buffer CDCLVP2104 — Low jitter, dual 1:4 universal-to-LVPECL buffer CDCLVP2106 — Low jitter, dual 1:6 universal-to-LVPECL buffer CDCLVP2108 — Low jitter, dual 1:8 universal-to-LVPECL buffer CDCLVP215 — Dual 1:5 high speed LVPECL fan out buffer LMK00301 — 3-GHz, 10-output differential fanout buffer / level translator LMK00304 — 3.1-GHz differential clock buffer/level translator with 4 configurable outputs LMK00306 — 3.1-GHz differential clock buffer/level translator with 6 configurable outputs LMK00308 — 3.1-GHz differential clock buffer/level translator with 8 configurable outputs LMK00334 — 4-output PCIe® Gen1/Gen2/Gen3/Gen4/Gen5 clock buffer and level translator LMK00334-Q1 — Automotive 4-output PCIe® Gen1/Gen2/Gen3/Gen4/Gen5 clock buffer and level translator LMK00338 — 8-output PCIe® Gen1/Gen2/Gen3/Gen4/Gen5 clock buffer and level translator LMK1C1102 — 2-channel output LVCMOS 1.8-V buffer LMK1C1102A — 1.8V,2.5V or 3.3V asynchronous 2 channel output LVCMOS buffer LMK1C1103 — 3-channel output LVCMOS 1.8-V buffer LMK1C1103A — 1.8V,2.5V or 3.3V asynchronous 3 channel output LVCMOS buffer LMK1C1104 — 4-channel output LVCMOS 1.8-V buffer LMK1C1104A — 1.8V,2.5V or 3.3V asynchronous 4 channel output LVCMOS buffer LMK1C1106 — 6-channel output LVCMOS 1.8-V buffer LMK1C1106A — 1.8V,2.5V or 3.3V asynchronous 6 channel output LVCMOS buffer LMK1C1108 — 8-channel output LVCMOS 1.8-V buffer LMK1C1108A — 1.8V,2.5V or 3.3V asynchronous 8 channel output LVCMOS buffer LMK1D1204 — 4-channel output LVDS 1.8-V buffer LMK1D1204P — 4-channel output LVDS 1.8-V, 2.5-V, and 3.3-V buffer with pin control LMK1D1208 — 8-channel output LVDS 1.8-V, 2.5-V, and 3.3-V buffer LMK1D1208I — 8-channel output, 1.8-V, 2.5-V, and 3.3-V LVDS buffer with I²C LMK1D1208P — 8-channel output 1.8-V, 2.5-V, and 3.3-V LVDS buffer with pin control LMK1D1212 — 12-channel output 1.8-V, 2.5-V, and 3.3-V LVDS buffer LMK1D1216 — 16-channel output 1.8-V, 2.5-V, and 3.3-V LVDS buffer LMK1D2102 — Dual bank 2-channel output LVDS 1.8-V, 2.5-V, and 3.3-V buffer LMK1D2102L — Low additive jitter LVDS buffer LMK1D2104 — Dual bank 4-channel output 1.8V, 2.5V and 3.3V LVDS buffer LMK1D2104L — Dual bank 4-channel output LVDS 1.8V, 2.5V, and 3.3V buffer with 0.7V output common mode option LMK1D2106 — Dual bank 6-channel output 1.8-V, 2.5-V, and 3.3-V LVDS buffer LMK1D2106L — Dual bank 2-channel output LVDS 1.8V, 2.5V and 3.3V buffer with 0.7V output common mode option LMK1D2108 — Dual bank 8-channel output 1.8-V, 2.5-V, and 3.3-V LVDS buffer
Clock generators
LMK03318 — Ultra-low jitter clock generator family with single PLL LMK03328 — Ultra-low jitter clock generator family with two independent PLLs LMK3C0105 — 5 output reference-less clock generator with bulk acoustic wave (BAW) LMK3C0105-Q1 — Automotive, 5 output reference-less clock generator with bulk acoustic wave (BAW) LMK3H0102 — Bulk acoustic wave (BAW)-based PCIe Gen 1 to Gen 7-compliant referenceless clock generator LMK3H0102-Q1 — Automotive PCIe gen 7 compliant, reference-less clock generator with bulk acoustic wave (BAW) LMK3H2104 — 4-output, PCIe Gen 1 to Gen 7 compliant, BAW reference-less clock generator, clock mux and buffer
Clock jitter cleaners
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
Oscillators
LMK60A0-148351 — 148.352-MHz, LVDS, high-performance, low jitter, differential oscillator LMK60A0-148M — 148.5-MHz, LVDS, high-performance, low jitter, differential oscillator LMK60E0-156257 — 156.257-MHz, LVPECL, ±25 ppm, high-performance, low-jitter oscillator LMK60E0-156M — 156.5-MHz, LVPECL, ±25 ppm, high-performance, low-jitter oscillator LMK60E0-212M — 212.5-MHz, LVPECL, ±25 ppm, high-performance, low-jitter oscillator LMK60E2-100M — 100.0-MHz, LVPECL, ±50 ppm, high-performance, low-jitter oscillator LMK60E2-125M — 125-MHz, LVPECL, ±50 ppm, high-performance, low-jitter oscillator LMK60E2-150M — 150-MHz, LVPECL, ±50 ppm, low jitter, standard oscillator LMK60E2-156M — 156.25-MHz, LVPECL, ±50 ppm, high-performance, low-jitter oscillator LMK60I2-100M — 100-MHz, HCSL, ±50 ppm, high-performance, low-jitter oscillator LMK60I2-322M — 322.27-MHz, HCSL, ±50 ppm, high-performance, low-jitter oscillator LMK61A2-100M — 100-MHz, ±50 ppm, LVDS ultra-low jitter standard differential oscillator LMK61A2-125M — 125-MHz, ±50 ppm, LVDS ultra-low jitter standard differential oscillator LMK61A2-156M — 156.25-MHz, ±50 ppm, LVDS ultra-low jitter standard differential oscillator LMK61A2-312M — 312.5-MHz, ±50 ppm, LVDS ultra-low jitter standard differential oscillator LMK61A2-644M — LVDS ultra-low jitter programmable oscillator with internal EEPROM LMK61E0-050M — 50-MHz, LVPECL ±25 ppm, ultra-low jitter, standard differential oscillator LMK61E0-155M — 155.52-MHz, LVPECL ±25 ppm, ultra-low jitter, standard differential oscillator LMK61E0-156M — 156.25-MHz, ±25 ppm, LVPECL ultra-low jitter standard differential oscillator LMK61E07 — Multi-signal format, ultra-low jitter programmable oscillator with internal EEPROM LMK61E08 — Ultra-low jitter programmable oscillator with internal EEPROM LMK61E0M — LVCMOS ultra-low jitter programmable oscillator with internal EEPROM LMK61E2 — Ultra-low jitter, EEPROM programmable oscillator for medical imaging and test and measurement LMK61E2-100M — 100-MHz, ±50 ppm, LVPECL ultra-low jitter standard differential oscillator LMK61E2-125M — 125-MHz, ±50 ppm, LVPECL ultra-low jitter standard differential oscillator LMK61E2-156M — 156.25-MHz, ±50 ppm, LVPECL ultra-low jitter standard differential oscillator LMK61E2-312M — 312.5-MHz, ±50 ppm, LVPECL ultra-low jitter standard differential oscillator LMK61I2-100M — 100-MHz, ±50 ppm, HCSL ultra-low jitter standard differential oscillator LMK61PD0A2 — ±50 ppm, ultra-low jitter, pin selectable, differential oscillator LMK62A2-100M — 100-MHz, LVDS ±50 ppm, high-performance, low-jitter, standard oscillator LMK62A2-150M — 150-MHz, LVDS ±50 ppm, high-performance, low-jitter, standard oscillator LMK62A2-156M — 156.25-MHz, LVDS ±50 ppm, high-performance, low-jitter oscillator LMK62A2-200M — 200-MHz, LVDS ±50 ppm, high-performance, low-jitter, standard oscillator LMK62A2-266M — 266.66-MHz, LVDS ±50 ppm, high-performance, low-jitter, standard oscillator LMK62E0-156M — 156.25-MHz, LVPECL, ±25 ppm, high-performance, low-jitter oscillator LMK62E2-100M — 100-MHz, LVPECL, ±50 ppm, high-performance, low-jitter oscillator LMK62E2-156M — 156.25-MHz, LVPECL, ±50 ppm, high-performance, low jitter, standard oscillator LMK62I0-100M — 100-MHz, HCSL, ±25 ppm, high-performance, low-jitter oscillator LMK62I0-156M — 156.25-MHz, HCSL, ±25 ppm, high-performance, low-jitter oscillator LMK6C — Low-jitter, high-performance, bulk-acoustic-wave (BAW) fixed-frequency LVCMOS oscillator LMK6D — Low-jitter, high-performance, bulk-acoustic-wave (BAW) fixed-frequency LVDS oscillator LMK6H — Low-jitter, high-performance, bulk-acoustic-wave (BAW) fixed-frequency HCSL oscillator LMK6P — Low-jitter, high-performance, bulk-acoustic-wave (BAW) fixed-frequency LVPECL oscillator
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
Support software
LMX9830-SW — LMX9830 Application Notes, Software, and Tools LMX9838-SW — LMX9838 Application Notes, Software, and Tools
Download options
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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VQFN (RGE) 24 Ultra Librarian
TI's Standard Terms and Conditions for Evaluation Items apply.

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