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Texas Instruments LMK62A2-156M25SIAT
- Part No.:
- LMK62A2-156M25SIAT
- Manufacturer:
- Texas Instruments
- Category:
- Oscillators
- Package:
- 6-SMD Module
- Datasheet:
-
LMK62A2-156M25SIAT.pdf
- Description:
- SILICONE OSC XO 156.2500MHZ LVDS
- Quantity:
- Payment:
- Shipping:
Inventory:173
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Product details
Overview
LMK62A2-156M25SIAT from Texas Instruments is a factory-programmed, low-jitter LVDS oscillator delivering 156.25 MHz output with ±50 ppm total frequency stability, 150 fs RMS phase jitter (12 kHz–20 MHz), and robust –60 dBc PSRR across 50 kHz–1 MHz supply ripple. It operates from a single 3.3-V supply over –40°C to +85°C and targets high-speed serial interface clocking in FPGA and processor systems.
For engineers reviewing the LMK62A2-156M25SIAT datasheet, LMK62A2-156M25SIAT pinout, LMK62A2-156M25SIAT application, or LMK62A2-156M25SIAT equivalent, this device serves as a drop-in replacement for legacy crystal oscillators in timing-critical infrastructure where jitter, supply noise immunity, and industrial temperature operation are design-critical.
Technical Context
The LMK62A2-156M25SIAT integrates a high-stability PLL-based oscillator core with on-chip power conditioning to suppress supply-induced spurs. Its LVDS output stage delivers 300–480 mV differential swing into 107 Ω, with 260–350 ps rise/fall time and 45–55% duty cycle.
It uses a fixed-frequency, pre-programmed architecture-no external configuration required-and features an OE (output enable) input with internal pulldown, enabling hardware-controlled output disable with 50 µs enable/disable latency and high-impedance state.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Frequency | 156.25 MHz - precisely matches Ethernet 10GBASE-R, CPRI, and PCIe Gen1/2 reference clock requirements. |
| Output Format | LVDS - provides low-noise, low-power differential signaling compatible with FPGA and ASIC clock inputs requiring 350 mVpp min swing. |
| Phase Jitter (RMS) | 150 fs (12 kHz–20 MHz) - ensures sub-UI timing margin for multi-gigabit SerDes links operating at 3.125+ Gbps. |
| Total Frequency Tolerance | ±50 ppm - covers initial calibration, temperature drift (–40°C to +85°C), voltage variation (±5%), solder reflow, and 5-year aging. |
| Supply Voltage | 3.3 V ±5% - simplifies power delivery by eliminating need for dedicated low-noise LDO; supports direct connection to system 3.3-V rail. |
| PSRR | –60 dBc @ 50 kHz–1 MHz - rejects board-level switching noise without additional filtering, reducing BOM cost and layout complexity. |
| Startup Time | 10 ms - meets typical FPGA configuration sequencing windows before first clock edge is required. |
Pinout & Package
LMK62A2-156M25SIAT uses a 5.0 mm × 3.2 mm, 6-pin QFM (SIA) package-pin-compatible with industry-standard 5032 XO footprints-enabling direct mechanical and layout replacement of quartz oscillators without PCB redesign.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: NC | No-connect | Unbonded pad; must be left floating or tied to GND per layout best practice-no electrical function. |
| 2: OE | Digital control input | LVCMOS-compatible enable signal; internal pulldown ensures safe power-up disabled state; 10 kΩ external pullup recommended. |
| 3: GND | Ground reference | Primary analog/digital ground return; requires ≥3 thermal vias to inner ground plane for thermal reliability and low-impedance return path. |
| 4: OUTP | Differential output (+) | LVDS true output; routed with matched length and controlled impedance (100 Ω diff) to maintain signal integrity and minimize skew. |
| 5: OUTN | Differential output (–) | LVDS complement output; paired with OUTP; both pins require identical trace geometry and termination at receiver. |
| 6: VDD | Power supply | 3.3-V analog supply; requires local decoupling with 10 µF, 1 µF, and 0.1 µF capacitors mounted on component side with short, wide traces. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low phase jitter | 150 fs RMS (12 kHz–20 MHz) enables reliable operation in 10G/25G Ethernet, CPRI, and high-speed ADC/DAC sampling clocks. |
| Integrated power conditioning | –60 dBc PSRR eliminates need for ultra-low-noise LDOs or complex multi-stage filtering in noisy power domains. |
| Factory-programmed frequency | 156.25 MHz delivered fully calibrated-no external programming circuitry, EEPROM, or configuration software required. |
| Industrial temperature range | –40°C to +85°C operation validated across full specification, supporting deployment in telecom line cards and outdoor base stations. |
| OE-controlled output disable | Hardware-selectable high-impedance state with 50 µs transition time allows dynamic clock gating during system sleep or reconfiguration. |
Applications
| 10G/25G Ethernet Line Cards | FPGA-Based Baseband Processing |
|---|---|
Use Scenario: Reference clock for 10GBASE-R PHY and XAUI interfaces in carrier-grade switches and routers. IC Role / Device Role / Timing Role: Primary low-jitter system clock source synchronizing SERDES lanes and MAC logic. Use Value: 150 fs jitter ensures <0.3 UI timing margin at 10.3125 Gbps, meeting IEEE 802.3ae jitter compliance without additional cleanup PLLs. |
Use Scenario: Clocking high-speed data converters and DSP cores in wireless BBU and massive MIMO radio units. IC Role / Device Role / Timing Role: Stable, low-phase-noise reference for ADC sampling clocks and FPGA fabric timing. Use Value: ±50 ppm stability over temperature and voltage guarantees deterministic timing alignment across multi-channel RF processing paths. |
| PCIe Gen2/Gen3 Root Complexes | Medical Imaging Data Acquisition |
Use Scenario: Reference clock for PCIe root ports in server motherboards and storage controllers. IC Role / Device Role / Timing Role: System-level timing reference for PCIe PHY layer and link training state machines. Use Value: LVDS output format and 156.25 MHz frequency match PCIe Gen2 spec; PSRR prevents power rail noise from inducing link training failures. |
Use Scenario: Synchronization source for multi-sensor CT/MRI acquisition modules requiring precise inter-channel timing. IC Role / Device Role / Timing Role: Master clock distributor generating sample clocks for parallel ADC arrays and digital beamforming engines. Use Value: Industrial temp rating and 150 fs jitter ensure consistent image resolution and SNR across clinical operating environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar oscillator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMK62E2-156M25SIAT | LVPECL output (700–1200 mVpp), higher current draw (95–110 mA), same jitter and PSRR. | Requires 50-Ω termination to VDD–2 V; not compatible with LVDS-only receivers. | Select when interfacing with legacy ASICs or FPGAs specifying LVPECL inputs and higher drive strength is needed. |
| LMK62A2-156M25SIAR | Identical electrical specs; differs only in packaging-2500-piece tape-and-reel vs. 250-piece small reel (SIAT). | No functional difference; SIAR suits high-volume production, SIAT suits prototyping and low-volume builds. | Choose SIAT for evaluation and NPI; switch to SIAR for volume manufacturing to reduce unit cost and handling overhead. |
Compared with LMK62E2-156M25SIAT, the LMK62A2-156M25SIAT offers lower power and LVDS compatibility at the expense of drive strength, while the SIAR variant provides identical performance in a cost-optimized reel format-enabling flexible sourcing across development and production phases.
Availability
LMK62A2-156M25SIAT is available at Aetrix Electronics and suitable for 10G Ethernet infrastructure, FPGA-based wireless baseband units, and medical imaging systems requiring stable component supply with guaranteed long-term continuity.
Supply support for LMK62A2-156M25SIAT includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor company specializing in analog, embedded processing, and clock solutions, with leadership in high-performance timing devices for communications and industrial markets.
The LMK62XX family is designed specifically for replacing quartz oscillators in high-speed digital systems-emphasizing ultra-low jitter, supply noise immunity, and drop-in mechanical compatibility with standard 5032 footprints.
FAQ
Is the LMK62A2-156M25SIAT pin-compatible with standard 5032 crystal oscillators?
Yes. It uses a 5.0 mm × 3.2 mm, 6-pin QFM (SIA) package explicitly designed to match the footprint and mounting dimensions of industry-standard 5032 XO modules, enabling direct mechanical replacement without PCB redesign or layout changes.
What is the recommended power supply decoupling for optimal jitter performance?
Texas Instruments specifies three-tier decoupling: 10 µF (bulk), 1 µF (mid-frequency), and 0.1 µF (high-frequency), all mounted on the component side with minimal trace length. Use 0201 or 0402 capacitors and connect directly to the VDD and GND pins via short, wide traces and multiple vias to ground plane.
Does the OE pin require an external pull-up resistor?
Yes. The OE pin has an internal pulldown but requires a 10 kΩ external pullup to VDD for reliable LVCMOS high-level assertion. This ensures defined startup behavior (output disabled until OE is actively driven high) and avoids floating-input noise sensitivity during power ramp.
Can the LMK62A2-156M25SIAT operate at frequencies other than 156.25 MHz?
No. It is factory-programmed for 156.25 MHz only. The LMK62XX series does not support user reprogramming or frequency adjustment; alternative part numbers (e.g., LMK62A2-200M) must be selected for different output frequencies.
LMK62A2-156M25SIAT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- LMK62XX
- Package/Case:
- 6-SMD Module
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Not For New Designs
- Base Resonator:
- Silicon
- Type:
- XO (Standard)
- Frequency:
- 156.25 MHz
- Function:
- Enable/Disable
- Output:
- LVDS
- Voltage - Supply:
- 3.3V
- Frequency Stability:
- ±50ppm
- Absolute Pull Range (APR):
- -
- Operating Temperature:
- -40°C ~ 85°C
- Spread Spectrum Bandwidth:
- -
- Current - Supply (Max):
- 100mA
- Ratings:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-QFM (5x3.2)
- Size / Dimension:
- 0.197" L x 0.126" W (5.00mm x 3.20mm)
- Height - Seated (Max):
- 0.043" (1.10mm)
LMK62A2-156M25SIAT FAQ
1.How can I place an order for LMK62A2-156M25SIAT through Aetrix?
Please submit a Request for Quotation (RFQ) for LMK62A2-156M25SIAT on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LMK62A2-156M25SIAT reliable?
The price and inventory of LMK62A2-156M25SIAT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMK62A2-156M25SIAT is usually 5 days.
3.What payment methods are accepted for LMK62A2-156M25SIAT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMK62A2-156M25SIAT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMK62A2-156M25SIAT?
LMK62A2-156M25SIAT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMK62A2-156M25SIAT order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LMK62A2-156M25SIAT?
For technical support, including LMK62A2-156M25SIAT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMK62A2-156M25SIAT requirements.
6.How does Aetrix verify that LMK62A2-156M25SIAT is sourced from the original manufacturer or authorized distributors?
All LMK62A2-156M25SIAT products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LMK62A2-156M25SIAT meets industry standards.
7.What is the process for return or replacement of LMK62A2-156M25SIAT?
All LMK62A2-156M25SIAT units undergo pre-shipment inspection (PSI). If there is an issue with LMK62A2-156M25SIAT, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LMK62A2-156M25SIAT part is unused and in its original packaging.
Return procedure for LMK62A2-156M25SIAT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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