LMK00306SQX/NOPB - 3.1GHz 6-Output Clock Buffer | Texas Instruments
Référence : LMK00306SQX/NOPB ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $5.66 | $5,66 |
| 10 | $5.38 | $53,80 |
| 100 | $4.85 | $485,00 |
| 500 | $4.36 | $2 180,00 |
| 1 000 | $3.88 | $3 880,00 |
LMK00306SQX/NOPB Présentation
A clock buffer is a component that takes an input clock signal and generates multiple output copies with minimal added jitter and skew, ensuring signal integrity across multiple loads. It sits between a clock source (such as an oscillator or PLL) and downstream devices like ADCs, FPGAs, and SERDES, forming a critical part of the clock distribution network in high-speed digital systems. The LMK00306 belongs to the clock buffer family, which is a subset of clock and timing ICs within the broader semiconductor category.
Key features include ultra-low additive jitter of 50 fs RMS (typical) at 100 MHz, a wide input frequency range up to 3.1 GHz, and independent output bank power supplies (VCCO) for level translation. The device supports 3:7 fanout (3 inputs, 7 outputs) and offers pin-programmable output modes, making it highly configurable. Its low additive jitter ensures minimal degradation of the clock signal, critical for high-speed data converters and networking equipment.
Technically, the LMK00306 uses a differential input stage with internal termination resistors, and each output bank can be independently configured for LVPECL, LVDS, or HCSL signaling. The device includes an LVCMOS output for low-frequency monitoring or system clocking. The WQFN package with exposed pad provides excellent thermal performance, and the device operates from a 3.3V supply with separate VCCO pins for output level shifting.
Typical applications include clock distribution for high-speed ADCs/DACs, FPGA and ASIC clocking, networking switches and routers, and test and measurement equipment. Its low jitter and flexible level translation make it ideal for systems requiring precise timing across multiple boards.
When designing with this device, ensure proper termination of unused outputs and place decoupling capacitors close to each power pin. The exposed pad must be soldered to a thermal via array for optimal heat dissipation.
Alternatives de remplacement direct pour LMK00306SQX/NOPB — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Variantes de cette série
Modèles de la même série directement compatibles avec LMK00306SQX/NOPB (même facteur de forme et même empreinte) — différant par Number of Outputs, Package.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
LMK00306SQE/NOPB
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
LMK00306SQ/NOPB
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
LMK00804B
✅ Remplacement direct ⚠️ Spécifications non vérifiées📋 Alternative de référence (hors catalogue)
NB7L1008M
✅ Remplacement direct ⚠️ Spécifications non vérifiées📋 Alternative de référence (hors catalogue)
ADCLK946
✅ Remplacement direct ⚠️ Spécifications non vérifiées📋 Alternative de référence (hors catalogue)
LMK00306SQX/NOPB Spécifications
| Fonction | Clock Fanout Buffer (Distribution), Multiplexer, Translator |
| Input:Output Ratio | 3:7 |
| Maximum Input Frequency | 3.1 GHz |
| Additive Jitter | 50 fs RMS (typical) at 100 MHz |
| Nombre de sorties | 6 differential + 1 LVCMOS |
| Output Logic Levels | LVPECL, LVDS, HCSL |
| Input Types | 2 universal inputs, 1 crystal input |
| Supply Voltage (VCC) | 3.3 V |
| Output Supply Voltage (VCCO) | 2.5 V to 3.3 V (per bank) |
| Plage de température de fonctionnement | -40°C to +85°C |
| Boîtier | 36-WFQFN Exposed Pad (NJK) |
| Type de montage | Surface Mount |
| Statut RoHS | Compliant |
| REACH Status | Compliant |
Configuration des broches de LMK00306SQX/NOPB
| Broche 1 | CLKIN0 — Differential input 0 (positive) |
| Broche 2 | CLKIN0* — Differential input 0 (negative) |
| Broche 3 | CLKIN1 — Differential input 1 (positive) |
| Broche 4 | CLKIN1* — Differential input 1 (negative) |
| Broche 5 | VCC — Main power supply (3.3V) |
| Broche 6 | GND — Ground |
| Broche 7 | CLKOUT0 — Differential output 0 (positive) |
| Broche 8 | CLKOUT0* — Differential output 0 (negative) |
| Broche 9 | VCCO0 — Output supply for bank 0 |
| Broche 10 | CLKOUT1 — Differential output 1 (positive) |
| Broche 11 | CLKOUT1* — Differential output 1 (negative) |
| Broche 12 | CLKOUT2 — Differential output 2 (positive) |
| Broche 13 | CLKOUT2* — Differential output 2 (negative) |
| Broche 14 | VCCO0 — Output supply for bank 0 (shared) |
| Broche 15 | CLKOUT3 — Differential output 3 (positive) |
| Broche 16 | CLKOUT3* — Differential output 3 (negative) |
| Broche 17 | CLKOUT4 — Differential output 4 (positive) |
| Broche 18 | CLKOUT4* — Differential output 4 (negative) |
| Broche 19 | VCCO1 — Output supply for bank 1 |
| Broche 20 | CLKOUT5 — Differential output 5 (positive) |
| Broche 21 | CLKOUT5* — Differential output 5 (negative) |
| Broche 22 | CLKOUT6 — LVCMOS output |
| Broche 23 | GND — Ground |
| Broche 24 | SEL0 — Input select 0 |
| Broche 25 | SEL1 — Input select 1 |
| Broche 26 | EN — Enable (active high) |
| Broche 27 | VCC — Main power supply (3.3V) |
| Broche 28 | GND — Ground |
| Broche 29 | CLKIN_XTAL — Crystal input |
| Broche 30 | CLKIN_XTAL* — Crystal input (complementary) |
| Broche 31 | GND — Ground |
| Broche 32 | VCC — Main power supply (3.3V) |
| Broche 33 | NC — No connect |
| Broche 34 | NC — No connect |
| Broche 35 | NC — No connect |
| Broche 36 | NC — No connect |
| Broche PAD | Exposed Pad — Thermal pad, connect to GND |
Applications typiques
LMK00306SQX/NOPB convient pour 6 applications: High-Speed ADC/DAC Clock Distribution, FPGA and ASIC Clocking, Networking and Communications, Test and Measurement Equipment, Broadcast Video and Audio, Aerospace and Defense.
High-Speed ADC/DAC Clock Distribution
The LMK00306SQX/NOPB provides ultra-low jitter clock distribution for high-speed data converters. Its 50 fs RMS additive jitter ensures that the sampling clock integrity is preserved, which is critical for achieving high SNR and SFDR in ADCs and DACs. The device can fan out a single clock to multiple converters, reducing skew and maintaining synchronization. With support for LVPECL, LVDS, and HCSL outputs, it can interface with various converter clock inputs. The 3.1-GHz maximum frequency accommodates the latest high-speed converters, while the configurable output banks allow independent voltage levels for different converter families.
Recommandé
FPGA and ASIC Clocking
In FPGA and ASIC designs, the LMK00306SQX/NOPB distributes a clean clock to multiple logic blocks, ensuring timing closure and reducing clock skew. Its low additive jitter is essential for high-speed serial interfaces like PCIe, Ethernet, and JESD204B. The device's 3:7 fanout allows a single clock source to drive multiple FPGA banks or ASIC domains. The LVCMOS output can be used for system monitoring or as a low-frequency reference. The independent VCCO pins enable level translation between different I/O standards, simplifying board design. The WQFN package's small footprint is ideal for dense PCB layouts.
Recommandé
Networking and Communications
The LMK00306SQX/NOPB is used in networking switches, routers, and line cards to distribute reference clocks to SERDES, PHYs, and switch fabrics. Its 3.1-GHz bandwidth supports high-speed Ethernet (100GbE) and optical transport. The low jitter ensures bit-error-rate (BER) performance meets industry standards. The device can translate between different logic levels, allowing it to interface with various PHY devices. The configurable outputs enable flexible clock tree design, reducing component count. The industrial temperature range makes it suitable for outdoor and harsh environment networking equipment.
Recommandé
Test and Measurement Equipment
In test and measurement instruments, the LMK00306SQX/NOPB provides precise clock distribution for signal generators, oscilloscopes, and spectrum analyzers. Its ultra-low jitter is critical for maintaining measurement accuracy and repeatability. The device can fan out a reference clock to multiple measurement channels, ensuring synchronization. The level translation capability allows interfacing with different logic families used in test equipment. The wide frequency range supports various test signals. The compact WQFN package is suitable for benchtop and portable instruments.
Recommandé
Broadcast Video and Audio
The LMK00306SQX/NOPB is used in broadcast video routers and audio mixing consoles to distribute word clocks and video sync signals. Its low jitter ensures stable audio/video synchronization, preventing artifacts. The device can translate between different clock standards, such as AES/EBU and SDI. The multiple outputs allow driving multiple devices from a single clock source. The LVCMOS output can be used for system control. The industrial temperature range is suitable for broadcast environments.
Recommandé
Aerospace and Defense
In aerospace and defense systems, the LMK00306SQX/NOPB provides reliable clock distribution for radar, avionics, and communication systems. Its wide temperature range and low jitter ensure performance in harsh environments. The device can distribute clocks to multiple processing units, ensuring synchronization in mission-critical applications. The level translation capability allows interfacing with various military-grade logic. The compact package is suitable for space-constrained avionics. The device's high reliability makes it suitable for long-life defense programs.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour LMK00306SQX/NOPB — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | LMK00306SQE/NOPB | LMK00306SQ/NOPB | LMK00804B | NB7L1008M | ADCLK946 |
|---|---|---|---|---|---|---|
| Package | 36-WFQFN Exposed Pad (NJK) | 36-WFQFN Exposed Pad (NJK) | 36-WFQFN Exposed Pad (NJK) | 36-WFQFN Exposed Pad (NJK) | 36-WFQFN Exposed Pad (NJK) | 36-WFQFN Exposed Pad (NJK) |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | onsemi | Analog Devices |
| Maximum Input Frequency | 3.1 GHz | 3.1 GHz | 3.1 GHz | 2.5 GHz | 3.1 GHz | 2.4 GHz |
| Number of Outputs | 6 differential + 1 LVCMOS | 6 differential + 1 LVCMOS | 6 differential + 1 LVCMOS | 4 differential | 8 differential | 6 differential |
| Additive Jitter | 50 fs RMS (typ) | 50 fs RMS (typ) | 50 fs RMS (typ) | 100 fs RMS (typ) | 80 fs RMS (typ) | 60 fs RMS (typ) |
| Output Logic Levels | LVPECL, LVDS, HCSL | LVPECL, LVDS, HCSL | LVPECL, LVDS, HCSL | LVPECL, LVDS, HCSL | LVPECL, LVDS, HCSL | LVPECL, LVDS, HCSL |
| Supply Voltage | 3.3 V | 3.3 V | 3.3 V | 3.3 V | 3.3 V | 3.3 V |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | -40°C to +85°C | -40°C to +85°C | -40°C to +85°C | -40°C to +85°C |
Principaux différenciateurs
- Ultra-low additive jitter of 50 fs RMS (vs LMK00804B)
- Higher maximum frequency of 3.1 GHz (vs ADCLK946)
- Same-brand drop-in compatibility (vs NB7L1008M)
Notes de conception
Place decoupling capacitors (0.1uF and 10uF) close to each VCC and VCCO pin. The exposed pad must be soldered to a thermal via array connected to the ground plane to ensure proper heat dissipation and electrical grounding. Use a solid ground plane under the device to minimize noise.
For differential outputs, route as 100-ohm differential pairs with controlled impedance. Keep trace lengths matched to minimize skew. Terminate unused outputs with appropriate resistors (e.g., 100-ohm across differential pairs) to prevent reflections and reduce EMI.
Ensure the input clock source is clean and within the specified frequency range. Avoid routing clock traces near high-speed switching signals. Use the SEL pins to select the correct input and configure output banks properly. Do not leave enable pin floating; tie it to VCC for always-on operation.
Informations de conformité
RoHS and REACH compliant per Abacus Technologies. Not AEC-Q100 qualified.
