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LMX2820

ACTIVE

22.6-GHz wideband RF synthesizer with phase synchronization, JESD and <5-µs frequency calibration

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Data sheet

LMX2820

ACTIVE
Data sheet Order now

Product details

Integrated VCO Yes Output frequency (min) (MHz) 45 Output frequency (max) (MHz) 22600 Normalized PLL phase noise (dBc/Hz) -236 Current consumption (mA) 500 Features Integer-boundary spurs (IBS) removal, Integrated VCO, JESD204B SYSREF, Multi-device sync, Phase adjustment, Ultra-fast VCO Calibration, Wideband 1/f noise (10-kHz offset at 1-GHz carrier) (dBc/Hz) -134 Rating Catalog Operating temperature range (°C) -40 to 85 Lock time (µs) (typ) (s) Loop BW dependent
Integrated VCO Yes Output frequency (min) (MHz) 45 Output frequency (max) (MHz) 22600 Normalized PLL phase noise (dBc/Hz) -236 Current consumption (mA) 500 Features Integer-boundary spurs (IBS) removal, Integrated VCO, JESD204B SYSREF, Multi-device sync, Phase adjustment, Ultra-fast VCO Calibration, Wideband 1/f noise (10-kHz offset at 1-GHz carrier) (dBc/Hz) -134 Rating Catalog Operating temperature range (°C) -40 to 85 Lock time (µs) (typ) (s) Loop BW dependent
VQFNP (RTC) 48 49 mm² 7 x 7
  • Output frequency: 45 MHz to 22.6 GHz
  • 36-fs rms jitter (12 kHz – 95 MHz) at 6 GHz
  • High-performance PLL
    • Figure of merit: –236 dBc/Hz
    • Normalized 1/f noise: –134 dBc/Hz
    • -95 dBc Integer Mode Spurs (fPD=100 MHz)
    • High phase detector frequency
      • 400-MHz integer mode
      • 300-MHz fractional mode
    • Programmable input multiplier
    • Direct PFD input for offset mixing support allowing PLL N divider to be one for ultra-low jitter
  • 2.5-µs fast VCO calibration time
  • Mute pin with 200-ns mute/unmute time
  • –45-dBc VCO leakage with doubler enabled
  • Support for external VCO up to 22.6-GHz
  • Synchronization of output phase across multiple devices
  • Two differential RF outputs and one differential SYSREF output for JESD204B support
  • Output frequency: 45 MHz to 22.6 GHz
  • 36-fs rms jitter (12 kHz – 95 MHz) at 6 GHz
  • High-performance PLL
    • Figure of merit: –236 dBc/Hz
    • Normalized 1/f noise: –134 dBc/Hz
    • -95 dBc Integer Mode Spurs (fPD=100 MHz)
    • High phase detector frequency
      • 400-MHz integer mode
      • 300-MHz fractional mode
    • Programmable input multiplier
    • Direct PFD input for offset mixing support allowing PLL N divider to be one for ultra-low jitter
  • 2.5-µs fast VCO calibration time
  • Mute pin with 200-ns mute/unmute time
  • –45-dBc VCO leakage with doubler enabled
  • Support for external VCO up to 22.6-GHz
  • Synchronization of output phase across multiple devices
  • Two differential RF outputs and one differential SYSREF output for JESD204B support

The LMX2820 is a high-performance, wideband synthesizer that can generate any frequency in the range of 45 MHz to 22.6 GHz. The high performance PLL with figure of merit of –236 dBc/Hz and high phase detector frequency can attain very low in-band noise and integrated jitter. The high-speed N-divider has no pre-divider, thus significantly reducing the amplitude and number of spurs. There is also a programmable input multiplier to mitigate integer boundary spurs.

The LMX2820 allows users to synchronize the output of multiple devices and also enables applications that need deterministic delay between input and output. The fast calibration algorithm greatly reduces the VCO calibration time, enabling systems requiring fast frequency hopping. The LMX2820 can generate or repeat SYSREF that is compliant to the JESD204B standard, allowing for its use as a low-noise clock source for high-speed data converters. This synthesizer can also be used with an external VCO. A direct PFD input pin is provided to support offset mixing for low spurious transmission.

The device runs from a single 3.3-V supply and has integrated LDOs that eliminate the need for onboard low-noise LDOs.

The LMX2820 is a high-performance, wideband synthesizer that can generate any frequency in the range of 45 MHz to 22.6 GHz. The high performance PLL with figure of merit of –236 dBc/Hz and high phase detector frequency can attain very low in-band noise and integrated jitter. The high-speed N-divider has no pre-divider, thus significantly reducing the amplitude and number of spurs. There is also a programmable input multiplier to mitigate integer boundary spurs.

The LMX2820 allows users to synchronize the output of multiple devices and also enables applications that need deterministic delay between input and output. The fast calibration algorithm greatly reduces the VCO calibration time, enabling systems requiring fast frequency hopping. The LMX2820 can generate or repeat SYSREF that is compliant to the JESD204B standard, allowing for its use as a low-noise clock source for high-speed data converters. This synthesizer can also be used with an external VCO. A direct PFD input pin is provided to support offset mixing for low spurious transmission.

The device runs from a single 3.3-V supply and has integrated LDOs that eliminate the need for onboard low-noise LDOs.
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Technical documentation

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Type Title Date
* Data sheet LMX2820 22.6-GHz Wideband PLLatinum RF Synthesizer With Phase Synchronization and JESD204B Support datasheet (Rev. C) PDF | HTML 04 Feb 2021
Application note Practical Clocking Considerations That Give Your Next High-Speed Converter Design an Edge PDF | HTML 23 Oct 2024
Application brief Compilation of RF Synthesizer Resources PDF | HTML 22 Oct 2024
Application note Sine to Square Wave Conversion Using Clock Buffers PDF | HTML 03 Sep 2024
Application brief Common Mistakes While Designing With Rf Clock Synthesizers and How To Mitigate the Same PDF | HTML 08 Aug 2024
Circuit design MASH_SEED Optimization and Impact on Spurs (LMX2820) PDF | HTML 08 Aug 2024
Application brief High-Frequency Clock (> 20GHz) Skew Variation Between Two RF Synthesizers Across Temperature PDF | HTML 26 Apr 2024
Application brief High-Frequency Delay Adjustments Between Two RF Synthesizers PDF | HTML 26 Apr 2024
Application brief LMX2820 with Internal Doubler versus LMX2594 PDF | HTML 16 Jan 2024
Application note LMX2820 RF Synthesizer Phase Noise Improvement With Alternative Topologies (Rev. A) PDF | HTML 22 May 2023
Application note External Doubler Extends LMX2820 Operation to 44 GHz PDF | HTML 31 Mar 2023
User guide How to Phase Synchronize Multiple LMX2820 Devices PDF | HTML 19 Dec 2022
Application note High Isolation, Fast Frequency Switching With LMX2820 in Ping-Pong Architecture PDF | HTML 20 Sep 2022
Application note Combining Two LMX2820 Synthesizer Outputs for Improved Phase Noise (Rev. A) PDF | HTML 03 Mar 2022
User guide LMX2820 Register Map (Rev. A) 09 Dec 2020
Application note Impact of PLL Jitter to GSPS ADC's SNR and Performance Optimization 11 Nov 2020
Application note Dramatically Improve Your Lock Time with VCO Instant Calibration PDF | HTML 17 Sep 2020
Certificate LMX2820EVM EU Declaration of Conformity (DoC) 09 Jun 2020
EVM User's guide LMX2820EVM Evaluation Module (Rev. A) PDF | HTML 05 Jan 2020

Design & development

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

Evaluation board

LMX2820EVM — LMX2820 22.6-GHz wideband RF synthesizer evaluation module

This evaluation module is for the LMX2820, which is a 22.6-GHz wideband RF synthesizser. This synthesizer supports JESD204B compliant SYSREF signal buffering and generation. The LMX2820 allows designers to synchronize the output of multiple instances of the device.
User guide: PDF | HTML
Not available on TI.com
Support software

TICSPRO-SW — TICS Pro GUI and Live Programming Tool for Clocking Devices

Texas Instruments clocks and synthesizers (TICS) pro software is used to program the evaluation modules (EVMs) for product numbers with these prefixes: CDC, LMK and LMX. These products include phase-locked loops and voltage-controlled oscillators (PLL+VCO), synthesizers and clocking devices.

Supported products & hardware

Supported products & hardware

Products
Clock generators
CDCE6214-Q1 — Ultra-low power clock generator supporting PCIe gen 1-5 with 2 inputs, 4 outputs and internal EEPROM CDCI6214 — PCIe Gen4 support ultra-low power clock generator with four programmable outputs & EEPROM LMK02000 — 1 to 800-MHz, precision clock distributor with integrated PLL and 3 LVDS / 5 LVPECL outputs LMK02002 — 1 to 800-MHz, precision clock distributor with integrated PLL and 4 LVPECL outputs LMK03200 — Precision 0-delay clock conditioner with integrated VCO 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 LMK3H0102 — Bulk acoustic wave (BAW)-based PCIe Gen 1 to Gen 6-compliant referenceless clock generator
RF PLLs & synthesizers
LMX1204 — 12.8-GHz RF buffer, multiplier and divider with JESD204B/C SYSREF support and phase synchronization LMX1214 — 1:5 18GHz RF buffer and divider with auxiliary clock LMX1860-SEP — Rad tolerant 15GHz RF buffer, multiplier, divider with SYSREF (JESD204B/C support) and FPGA clock LMX1906-SP — Radiation-hardness-assured (RHA) 15GHz buffer, multiplier and divider with SYSREF and FPGA clock LMX2485 — 500-MHz to 3-GHz delta-sigma low power dual PLL for RF personal communications LMX2485E — 50-MHz to 3-GHz delta-sigma low power dual PLL for RF personal communications LMX2485Q-Q1 — 500MHz to 3GHz automotive delta-sigma low power dual PLL LMX2486 — 1-GHz to 4.5-GHz delta-sigma low power dual PLL for RF personal communications LMX2487 — 1 to 6-GHz delta-sigma low power dual PLLatinum frequency synthesizer with 3.0-GHz integer PLL LMX2487E — 3-GHz to 7.5-GHz delta-sigma low power dual PLL for RF personal communications LMX2491 — 6.4-GHz low noise fractional-N PLL with ramp/chirp generation LMX2492 — 500MHz to 14GHz wideband, low noise fractional-N PLL with ramp/chirp generation LMX2492-Q1 — Automotive grade 500-MHz to 14-GHz wideband, low noise fractional-N PLL with ramp/chirp generation LMX2531 — High performance frequency synthesizer system with integrated VCO LMX2541 — Ultra-low noise PLLatinum frequency synthesizer with integrated VCO LMX2571 — 1.34-GHz, low-power, extreme-temperature RF synthesizer with frequency-shift keying (FSK) modulation LMX2571-EP — Enhanced-product, 1.34-GHz, low-power, extreme-temperature RF synthesizer with FSK modulation LMX2572 — 6.4-GHz low-power wideband RF synthesizer LMX2572LP — 2-GHz low power wideband RF synthesizer with FSK modulation LMX2581 — 3.76-GHz wideband frequency synthesizer with integrated VCO LMX2581E — 3.8-GHz wideband frequency synthesizer with integrated VCO LMX2582 — 5.5-GHz high performance, wideband PLLatinum RF synthesizer LMX2592 — 9.8-GHz wideband frequency synthesizer with integrated VCO LMX2594 — 15-GHz wideband PLLatinum™ RF synthesizer with phase synchronization and JESD204B support LMX2595 — 20-GHz wideband RF synthesizer with phase synchronization & JESD204B support LMX2820 — 22.6-GHz wideband RF synthesizer with phase synchronization, JESD and <5-µs frequency calibration
Clock buffers
CDCDB2000 — DB2000QL compliant 20-output clock buffer for PCIe® Gen 1 to Gen 5 CDCDB800 — 8-output clock buffer for PCIe® Gen 1 to Gen 6 LMK01000 — 1.6-GHz high performance clock buffer, divider, and distributor with 3 LVDS & 5 LVPECL outputs LMK01010 — 1.6-GHz high performance clock buffer, divider, and distributor with 8 LVDS outputs LMK01020 — 1.6-GHz high performance clock buffer, divider, and distributor with 8 LVPECL outputs LMK01801 — Dual clock distribution LMK1D1208I — 8-channel output, 1.8-V, 2.5-V, and 3.3-V LVDS buffer with I²C LMKDB1108 — 8-output LP-HCSL clock buffer for PCIe Gen 1 to Gen 6 LMKDB1120 — DB2000QL-compliant 20-output clock buffer for PCIe Gen 1 to Gen 6 LMKDB1204 — 2-input 4-output LP-HCSL clock MUX for PCIe Gen 1 to Gen 6 LMKDB1104 — 4-output LP-HCSL clock buffer for PCIe Gen 1 to Gen 6
Oscillators
LMK61E0M — LVCMOS ultra-low jitter programmable oscillator with internal EEPROM LMK61E2 — 156.250-MHz, ±50 ppm, ultra-low jitter, integrated EEPROM, fully programmable oscillator
Clock jitter cleaners
LMK04100 — Precision clock conditioners clock jitter cleaner with cascaded PLLs LMK04101 — Jitter cleaner with integrated 1430 to 1570-MHz VCO:3 outputs for 2VPEC/LVPEC+4 outputs for LVCOMS LMK04102 — Jitter cleaner with integrated 1600 to 1750-MHz VCO:3 outputs for 2VPEC/LVPEC+4 outputs for LVCOMS LMK04110 — Jitter cleaner with integrated 1185 to 1296-MHz VCO:5 outputs for 2VPEC/LVPEC LMK04111 — Jitter cleaner with integrated 1430 to 1570-MHz VCO:5 outputs for 2VPEC/LVPEC LMK04131 — Jitter cleaner with integrated 1430 to 1570-MHz VCO:2 outputs for 2VPEC/LVPEC+LVDS+LVCOMS LMK04133 — Jitter cleaner with integrated 1840 to 2160-MHz VCO:2 outputs for 2VPEC/LVPEC+LVDS+LVCOMS LMK04208 — Ultra low-noise clock jitter cleaner with 6 programmable outputs LMK04228 — Ultra low-noise clock jitter cleaner with dual loop PLLs LMK04368-EP — Enhanced product ultra-low-noise 3.2-GHz JESD204C jitter cleaner LMK04610 — Ultra low-noise and low power JESD204B compliant clock jitter cleaner with dual PLLs LMK04616 — Ultra low-noise and low power JESD204B compliant clock 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 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
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 LMK5B12204 — Ultra-low jitter clock generator with network synchronization and BAW technology 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
LMK03806BEVAL — LMK03806B Evaluation Board LMK04208EVM — Two Input, 6+1 Output, Clock Jitter Cleaner With Dual Cascaded PLLs and Integrated 2.9 GHz VCO LMK04616EVM — LMK04616 Evaluation Module LMK04805BEVAL — Clock Jitter Cleaner With Dual Cascaded PLLs and Integrated 2.2 GHz VCO LMK04806BEVAL — Clock Jitter Cleaner With Dual Cascaded PLLs and Integrated 2.5 GHz VCO LMK04816BEVAL — Three Input, Thirteen Output, Clock Jitter Cleaner with Dual Cascaded PLLs and Integrated 2.5 GHz VC LMK04826BEVM — LMK04826BEVM Evaluation Module LMK04828BEVM — LMK04828 evaluation module LMK04832EVM — LMK04832 JESD204B Clock Jitter Cleaner/Clock Generator/Distribution Evaluation Module LMK04832SEPEVM — LMK04832-SEP evaluation module for ultra-low-noise, 3.2-GHz 15-output clock jitter clea LMK04906BEVAL — Three Input, Seven Output, Clock Jitter Cleaner with Dual Cascaded PLLs and Integrated 2.5 GHz VCO LMK5B33216EVM — LMK5B33216 evaluation module for 16-output, three DPLL and APLL, network synchronizer with BAW VCO LMX2571EPEVM — LMX2571-EP evaluation module for 1.34-GHz, low-power, extreme-temperature RF synthesizer LMX2582EVM — LMX2582EVM High Performance, Wideband Frequency PLLatinum RF Synthesizer With Integrated VCO LMX2592EVM — LMX2592EVM high-performance, wideband frequency RF synthesizer PLLATINUM™ integrated circuit 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 LMK04832EVM-CVAL — LMK04832-SP evaluation module for ultra-low-noise, dual-loop, JESD204B clock jitter cleaner LMK04368EPEVM — LMK04368-EP evaluation module for JESD204B/C dual-loop clock jitter cleaner LMK61E0MEVM — LMK61E0M Ultra-Low-Jitter Programmabler Oscillator Evaluation Module LMK61E2EVM — LMK61E2EVM Ultra-Low-Jitter Programmable Oscillator Evaluation Module LMX1204EVM — LMX1204 evaluation module for RF buffer, multiplier and divider with JESD204B/C SYSREF support LMX2594EVM — LMX2594EVM 15-GHz wideband RF synthesizer with phase synchronization & JESD204B evaluation module LMX2595EVM — 20-GHz Wideband RF Synthesizer With Phase Synchronization and JESD204B Evaluation Module LMX2615EVM-CVAL — Space grade synthesizer evaluation module LMX2694EPEVM — 15-GHz wideband RF synthesizer evaluation module LMX2572EVM — 6.4-GHz Low Power Wideband RF Synthesizer with Phase Synchronization and JESD204B Support LMX2572LPEVM — 2-GHz Low Power Wideband RF Synthesizer with FSK Modulation Evaluation Module LMX2581EVM — LMX2581 evaluation module LMX2820EVM — LMX2820 22.6-GHz wideband RF synthesizer evaluation module LMX8410LEVM — I/Q demodulator evaluation module LMK5B12212EVM — LMK5B12212 evaluation module LMK5B33414EVM — LMK5B33414 evaluation module for 14-output, three DPLL and APLL, network synchronizer with BAW VCO LMK5C33216AEVM — LMK5C33216A evaluation module LMK5C33216EVM — LMK5C33216 clock synchronizer DPLL 2 input 16 outputs evaluation module LMK5C33414AEVM — LMK5C33414A evaluation module LMK05028EVM — LMK05028 Network Clock Generator and Synchronizer Evaluation Module LMK05318BEVM — Network synchronizer clock evaluation module CDCI6214EVM — CDCI6214 Ultra-Low Power Clock Generator Evaluation Module CDCE6214-Q1EVM — 4 differential and 1 LVCMOS outputs clock generator evaluation module LMK3H0102EVM — LMK3H0102 evaluation module
Software
IDE, configuration, compiler or debugger
CODELOADER — CodeLoader Software for device register programming
Download options
Simulation model

LMX2820 IBIS model

SNAM245.ZIP (45 KB) - IBIS Model
Download
Design tool

CLOCK-TREE-ARCHITECT — Clock tree architect programming software

Clock tree architect is a clock tree synthesis tool that streamlines your design process by generating clock tree solutions based on your system requirements. The tool pulls data from an extensive database of clocking products to generate a system-level multi-chip clocking solution.
Design now
Reference designs

TIDA-010230 — Multi-channel RF transceiver, low-noise clocking reference design for radar and EW applications

In modern radar and electronic warfare (EW) systems, active electronically-scanned array (AESA) antenna systems are often used with high speed multi-channel RF transceivers. These systems require very low noise clocking capable of precise channel-to-channel skew adjustment to achieve the optimal (...)
Design guide: PDF
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VQFNP (RTC) 48 Ultra Librarian
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