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LMK05318RGZT
Texas Instruments
IC ULTRA LOW JITTER SNGL 48VQFN
1164 Pcs New Original In Stock
IC 800MHz 2 48-VFQFN Exposed Pad
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5.0 / 5.0
- (289 Ratings)
LMK05318RGZT
Product Overview
1312020
DiGi Electronics Part Number
LMK05318RGZT-DGManufacturer
Texas Instruments
LMK05318RGZT
Description
IC ULTRA LOW JITTER SNGL 48VQFNInventory
1164 Pcs New Original In Stock
IC 800MHz 2 48-VFQFN Exposed Pad
Quantity
Minimum 1
Minimum 1
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LMK05318RGZT Technical Specifications
Category
Clock/Timing, Clock Generators, PLLs, Frequency Synthesizers
Packaging
Cut Tape (CT) & Digi-Reel®
Series
-
Product Status
Active
DiGi-Electronics Programmable
Not Verified
Type
-
PLL
Yes with Bypass
Input
Clock, LVCMOS
Output
CML, HCSL, LVCMOS, LVDS, LVPECL
Number of Circuits
2
Ratio - Input:Output
2:8
Differential - Input:Output
Yes/Yes
Frequency - Max
800MHz
Divider/Multiplier
Yes/Yes
Voltage - Supply
1.71V ~ 3.465V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
48-VFQFN Exposed Pad
Supplier Device Package
48-VQFN (7x7)
Base Product Number
LMK05318
Datasheet & Documents
Manufacturer Product Page
LMK05318RGZT Specifications
HTML Datasheet
LMK05318RGZT-DG
Environmental & Export Classification
RoHS Status
ROHS3 Compliant
Moisture Sensitivity Level (MSL)
3 (168 Hours)
REACH Status
REACH Unaffected
ECCN
EAR99
HTSUS
8542.39.0001
Additional Information
Other Names
296-53429-6
296-53429-2
296-53429-1
Standard Package
250
Reviews
5.0/5.0-(Show up to 5 Ratings)
de desembre 02, 2025
瞬時に発送され、サポートも親切でとても良かったです。
de desembre 02, 2025
DiGi Electronicsの価格は非常にお手頃で、コストパフォーマンスが抜群です。
de desembre 02, 2025
They consistently provide competitive pricing and fast, reliable shipping.
de desembre 02, 2025
Their customer service feels personalized and genuinely caring.
de desembre 02, 2025
Customer support is always courteous and ready to help with any concerns.
de desembre 02, 2025
Their ability to maintain plentiful stock levels demonstrates their professionalism.
de desembre 02, 2025
I highly commend DiGi Electronics for their excellent after-sales service.
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Frequently Asked Questions (FAQ)
What are the key design-in risks when integrating the LMK05318RGZT into a mixed-signal PCB with high-speed ADCs and FPGAs?
When integrating the LMK05318RGZT in mixed-signal systems, primary risks include power supply noise coupling and jitter degradation due to poor layout. The LMK05318RGZT supports ultra-low jitter (<100 fs typical), but this requires clean 1.8V and 3.3V rails with dedicated LDOs and careful bypassing (e.g., 100nF + 10uF close to VCC pins). Use separate ground planes for analog and digital sections, and route clock outputs away from sensitive analog traces. Pay special attention to the exposed pad grounding—tie it directly to the analog ground with multiple vias to minimize thermal resistance and EMI. Clock routing should maintain controlled impedance (e.g., 50Ω or 100Ω differential) and avoid 90-degree bends to preserve signal integrity for downstream FPGAs or ADCs.
Can the LMK05318RGZT replace the SI5345B in a 10Gbps SerDes timing architecture, and what are the critical differences to watch?
The LMK05318RGZT can partially replace the SI5345B in applications below 800MHz with lower jitter requirements, but it lacks the SI5345B's ultra-high integration (e.g., up to 12 outputs) and JESD204B/C support. Key trade-offs: the LMK05318RGZT offers dual PLLs with input redundancy and low power, but has only 8 differential outputs versus 12 on SI5345B. Clock tree redesign may be needed for fan-out. Also, SI5345B supports finer fractional dividers for exact frequency synthesis. Verify that the LMK05318RGZT meets your phase noise target (< -120 dBc/Hz at 10kHz offset) and ensure input clock compatibility—SI5345B often runs on differential inputs, while LMK05318RGZT accepts LVCMOS single-ended with proper termination to prevent skew.
How does supply voltage ripple affect jitter performance in the LMK05318RGZT, and how can it be mitigated in high-noise environments?
Supply voltage ripple directly degrades phase noise and jitter in the LMK05318RGZT, especially on the VCO and output driver rails. Even 10mVpp ripple can increase integrated jitter by >200 fs. Use low-noise LDOs (e.g., TPS7A47) instead of switching regulators near the device. Place 10μF X7R and 100nF ceramic capacitors within 2mm of each supply pin, and consider ferrite beads on each VCC line for additional filtering. Monitor ripple with a 1GHz+ bandwidth probe in current-carrying modes. Additionally, separate the PLL and output buffer supplies if possible, as per datasheet recommendations, to isolate high-current switching noise from the sensitive analog core.
What are the reliability concerns when operating the LMK05318RGZT at 85°C in an industrial outdoor enclosure?
At 85°C ambient, the LMK05318RGZT is within its rated operating range (-40°C to 85°C), but thermal management is critical due to internal power dissipation from multiple clock outputs. The 48-VQFN exposed pad must be properly soldered to a sufficient PCB copper area (≥ 50mm²) with thermal vias to prevent junction temperatures exceeding 115°C. Monitor ambient temperature cycling—condensation and thermal stress can compromise long-term reliability. Additionally, ensure stable input clock quality, as jitter accumulation worsens with temperature. Use conformal coating if humidity exceeds 85% RH to comply with MSL-3 handling and prevent corrosion. Consider adding a watchdog circuit to detect clock failure in mission-critical applications.
What are the practical limitations of using the LMK05318RGZT as a clock buffer alternative to the CDCM6208 in high-fanout timing designs?
While the LMK05318RGZT provides 8 differential outputs and dual PLLs, it is not optimized purely as a buffer like the CDCM6208, which supports up to 16 outputs. The LMK05318RGZT has higher propagation skew between output types (CML vs LVDS vs LVCMOS), limiting use in strict skew-matching applications. Additionally, CDCM6208 offers lower additive jitter (<50 fs) in buffer mode, whereas LMK05318RGZT’s jitter depends on PLL configuration. If bypassing the PLL, ensure the bypass path is calibrated and verify additive jitter stays below 70 fs RMS. For designs requiring >8 devices, combine LMK05318RGZT with a dedicated low-jitter fanout buffer to avoid overloading outputs and maintain signal integrity.
Quality Assurance (QC)
DiGi ensures the quality and authenticity of every electronic component through professional inspections and batch sampling, guaranteeing reliable sourcing, stable performance, and compliance with technical specifications, helping customers reduce supply chain risks and confidently use components in production.
LMK05318RGZT CAD Models
Texas Instruments LMK05318RGZT PCB symbols & footprints
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