LMK04100SQX/NOPB Texas Instruments Integrated Circuit (Quad Flat No-Lead) In Stock
Texas Instruments LMK04100SQX/NOPB is a dual-channel precision clock synthesizer and jitter cleaner targeting SDH and SONET telecom applications, packaged in a 48-pin QFN. It delivers ultra-low jitter clock outputs for synchronizing high-speed communication line cards and networking equipment.
- Manufacturer
- Texas Instruments
- Package
- Quad Flat No-Lead
- Pin Count
- 49
- Lifecycle
- ACTIVE
- Datasheet
- LMK04100SQX/NOPB Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- -40.0°C to 85.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Dual-channel clock synthesizer and jitter cleaner optimized for SDH and SONET telecom applications
- Ultra-low output jitter enabling high-performance clock distribution in OC-3 to OC-192 line cards
- Integrated PLL with 2 output channels for flexible clock architecture in networking equipment
- 48-pin QFN (PQCC-N48) package with exposed pad for thermal management on dense PCB designs
- Pb-free and RoHS-compliant construction meeting modern environmental and reliability standards
Applications
The LMK04100SQX/NOPB is deployed in SDH and SONET telecom line cards and optical networking equipment where ultra-low jitter clock synthesis is mandatory for OC-3 to OC-192 framer synchronization. Wireless base station timing modules and network synchronization units use it to distribute reference clocks across multiple high-speed serial links with minimal phase noise contribution. Its dual-channel output architecture also suits test and measurement instruments requiring two synchronized, low-jitter clocks derived from a single reference.
Specifications
| Pbfree Code | Yes |
| YTEOL | 15 |
| Applications | SDH; SONET |
| JESD-30 Code | S-PQCC-N48 |
| JESD-609 Code | e3 |
| Number of Channels | 2 |
| Number of Functions | 1 |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | LCC48,.28SQ,20 |
| Package Shape | SQUARE |
| Package Style | CHIP CARRIER, HEAT SINK/SLUG |
| Peak Reflow Temperature (Cel) | 260 |
| Supply Voltage-Nom | 3.3V |
| Surface Mount | YES |
| Telecom IC Type | ATM/SONET/SDH SUPPORT CIRCUIT |
| Temperature Grade | INDUSTRIAL |
| Terminal Finish | Tin (Sn) |
| Terminal Form | NO LEAD |
| Terminal Pitch | 0.5mm |
| Terminal Position | QUAD |
| Time@Peak Reflow Temperature-Max (s) | 30 |
| Package | Quad Flat No-Lead |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 3 |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.90 |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for LMK04100SQX/NOPB:
Frequently Asked Questions
Which telecom standards is the LMK04100SQX/NOPB specifically optimized for in clock synthesis applications?
The LMK04100SQX/NOPB is optimized for SDH (Synchronous Digital Hierarchy) and SONET (Synchronous Optical Networking) telecom applications, supporting reference clock synthesis and jitter cleaning at standard telecom rates from OC-3 at 155.52 MHz to OC-192 at 9.953 GHz. Its PLL architecture is tuned to meet the stringent phase noise and wander specifications mandated by ITU-T G.8262 and Telcordia GR-253 standards.
How many clock output channels does the LMK04100SQX/NOPB provide and how are they configured?
The LMK04100SQX/NOPB provides 2 independent clock output channels, allowing simultaneous distribution of synchronized reference clocks to multiple clock domains or line-card subsystems. Both output channels are derived from the integrated PLL, enabling applications where 2 separate clocks at different frequencies or phases must be generated from a single input reference.
What package does the LMK04100SQX/NOPB use and how does it support thermal management?
The LMK04100SQX/NOPB is housed in a 48-pin QFN package (JESD-30 code S-PQCC-N48) with a 7.1 mm x 7.1 mm body and an exposed thermal pad on the underside. The exposed pad provides a direct thermal path to the PCB ground plane, reducing junction-to-board thermal resistance and ensuring stable operation in high-density line-card environments where board temperature can exceed 85°C.
For a SONET OC-192 line card, why is a dedicated jitter cleaner like LMK04100SQX/NOPB necessary instead of a simple crystal oscillator?
A crystal oscillator provides a clean initial reference but cannot remove accumulated jitter from incoming recovered clocks in SONET OC-192 systems, where phase noise must remain below -130 dBc/Hz at 1 kHz offset to meet Telcordia requirements. The LMK04100SQX/NOPB's integrated PLL-based jitter cleaner filters wander and jitter from the recovered reference, reshaping the clock to meet the ITU-T G.813 clock quality specifications required at each SONET network element.
When would an engineer choose LMK04100SQX/NOPB over a general-purpose clock buffer for SDH equipment?
A general-purpose clock buffer merely copies and drives an existing clock without reducing its phase noise or jitter, making it inadequate for SDH equipment where accumulated jitter on recovered reference clocks must be cleaned to meet ITU-T G.8262 wander transfer specifications. The LMK04100SQX/NOPB's PLL-based synthesis actively attenuates high-frequency jitter components, synthesizes 2 independent output clocks from a noisy input, and targets SDH/SONET rates — capabilities that a simple buffer fundamentally cannot provide.
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Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
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