Texas Instruments LMK60A0-148M35SIAT

Overview

LMK60A0-148M35SIAT from Texas Instruments is a factory-programmed, low-jitter LVDS oscillator delivering 148.5 MHz output with ±25 ppm total frequency stability over –40°C to +85°C, 3.3-V supply, and 150 fs RMS phase jitter (12 kHz–20 MHz). It serves as a high-stability clock reference in FPGA and processor clocking, telecom line cards, and storage systems.

For engineers reviewing the LMK60A0-148M35SIAT datasheet, LMK60A0-148M35SIAT pinout, LMK60A0-148M35SIAT application, or LMK60A0-148M35SIAT equivalent, key selection criteria include LVDS output compatibility, industrial temperature operation, 7 mm × 5 mm QFM package footprint, and PSRR of –60 dBc against 50-mV supply ripple at 100 kHz–1 MHz.

Technical Context

The LMK60A0-148M35SIAT integrates a high-performance PLL-based oscillator core with internal power conditioning for robust supply noise rejection. Its LVDS output stage delivers 300–480 mV differential swing with 125 Ω differential impedance and 150–250 ps rise/fall time (20%–80%).

It features an LVCMOS OE input with internal pull-up, enabling high-impedance output disable within 50 µs. The device operates exclusively from a single 3.3 V ±5% supply and requires no external configuration-frequency and format are factory-programmed.

Key Specifications

Pinout & Package

LMK60A0-148M35SIAT uses a 6-pin Quad Flat Module (QFM) package designated SIA, measuring 7 mm × 5 mm × 1.15 mm max height, with exposed thermal pad connected to GND for enhanced thermal dissipation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-jitter LVDS oscillator applications.

Compared with LMK60E0-156257SIAT, the LMK60A0-148M35SIAT provides exact SMPTE-aligned frequency but lacks Ethernet-specific tuning; versus Si510-148M50-AG, it trades programmability for smaller size, lower jitter, and guaranteed factory calibration-critical for video and telecom timing integrity.

Availability

LMK60A0-148M35SIAT is available at Aetrix Electronics and suitable for video broadcast infrastructure, telecom line cards, and FPGA-based embedded vision systems requiring stable component supply across extended production lifecycles.

Supply support for LMK60A0-148M35SIAT 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 headquartered in Dallas, Texas, specializing in analog, embedded processing, and clock solutions for industrial, automotive, and communications markets.

The LMK60XX product line delivers high-performance, low-jitter oscillators targeting FPGA, processor, and SerDes clocking in datacenter, telecom, and medical imaging systems where deterministic timing is critical.

FAQ

Is LMK60A0-148M35SIAT pin-compatible with standard 7050 crystal oscillator footprints?

Yes. The 6-pin QFM (SIA) package measures 7 mm × 5 mm and is explicitly designed to match industry-standard 7050 XO footprints. Pin 1 (OE) replaces the traditional ST pin, and pins 4/5 (OUTP/OUTN) align with differential output pads-enabling mechanical and PCB layout compatibility without redesign.

What is the maximum allowable voltage droop on VDD during power-up?

The LMK60A0-148M35SIAT specifies a maximum VDD droop of 0.1 V during startup. This limit ensures reliable oscillator lock and output enable timing; exceeding it may cause extended start-up delay (>10 ms) or intermittent output failure until VDD stabilizes above 2.72 V threshold.

Does the device require external termination resistors for LVDS operation?

No. The LMK60A0-148M35SIAT's LVDS output driver is internally matched to 125 Ω differential impedance and expects 100 Ω external termination at the receiver end. No series or parallel resistors are needed on the oscillator side-only proper 100-Ω differential PCB trace termination at the load.

Can the OE pin be left unconnected, or must it be actively driven?

The OE pin has an internal pull-up to VDD, so it defaults to enabled (output active) when left floating. However, TI recommends tying OE to VDD via a 10-kΩ resistor for noise immunity in high-EMI environments. Leaving it open is acceptable per datasheet but not advised for ruggedized industrial designs.