Texas Instruments LMK04110SQ/NOPB

Overview

LMK04110SQ/NOPB from Texas Instruments is a precision clock jitter cleaner IC featuring cascaded PLLatinum™ PLL architecture with two independent phase-locked loops (PLL1 and PLL2), integrated VCO (1185–1296 MHz), five LVPECL/LVDS/LVCMOS programmable outputs, and MICROWIRE (SPI) interface. It delivers ultra-low jitter cleaned clocks up to 1080 MHz for high-speed serial interfaces in cellular basestations and optical transport systems.

For engineers reviewing the LMK04110SQ/NOPB datasheet, LMK04110SQ/NOPB pinout, LMK04110SQ/NOPB application, or LMK04110SQ/NOPB equivalent, key selection criteria include dual-PLL jitter cleaning capability, 5-channel output format flexibility (LVPECL/LVDS/LVCMOS), industrial temperature range (−40°C to +85°C), 3.15–3.45 V supply operation, and WQFN-48 package compatibility with thermal pad grounding.

Technical Context

The LMK04110SQ/NOPB implements a two-stage PLL architecture: PLL1 accepts redundant reference inputs (CLKin0/CLKin1) with loss-of-signal detection and automatic/manual switching, while PLL2 locks to an external VCXO or crystal via OSCin/OSCin* with optional ×2 frequency doubling. Its internal VCO operates at 1185–1296 MHz and feeds five dedicated channel divider blocks.

Each of the five outputs (CLKout0–CLKout4) supports independently programmable formats-LVPECL, LVDS, or LVCMOS-and configurable dividers enabling common telecom frequencies including 61.44 MHz, 77.76 MHz, 100 MHz, 125 MHz, 156.25 MHz, 311.04 MHz, 622.08 MHz, and 983.04 MHz-all derived from the same VCO frequency to maintain phase coherence.

Key Specifications

Pinout & Package

LMK04110SQ/NOPB uses a 48-pin WQFN package (7.0 × 7.0 × 0.8 mm) with exposed die attach pad (DAP) requiring direct connection to GND for thermal and electrical integrity. Power domains are segmented across 14 VCC pins for noise isolation between analog VCO, PLL charge pumps, digital logic, and output buffers.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar clock jitter cleaning applications.

Compared with LMK04806B and Si5341-A01A-GM, the LMK04110SQ/NOPB offers superior RMS jitter (150 fs) at key telecom frequencies, native LVCMOS support on two channels, and explicit redundancy handling via dual reference inputs - making it optimal for mission-critical basestation and OTN timing where jitter floor and failover robustness are non-negotiable.

Availability

LMK04110SQ/NOPB is available at Aetrix Electronics and suitable for multi-carrier basestations, optical transport network line cards, and broadcast video infrastructure requiring stable component supply, long-term lifecycle assurance, and traceable sourcing from authorized channels.

Supply support for LMK04110SQ/NOPB 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 leader specializing in analog, embedded processing, and clock solutions for industrial, communications, and automotive markets.

The LMK04110SQ/NOPB belongs to TI's LMK041xx family of jitter cleaners, designed specifically for telecom infrastructure applications demanding sub-200 fs jitter, dual-reference redundancy, and multi-format clock distribution in compact form factors.

FAQ

What is the maximum supported output frequency for LMK04110SQ/NOPB?

The LMK04110SQ/NOPB supports a maximum output frequency of 1080 MHz across all five channels when configured in LVPECL or LVDS mode with proper termination (50 Ω to VCC−2 V for LVPECL, 100 Ω differential for LVDS). This enables direct clocking of 10G/25G SerDes PHYs and high-speed ADCs without external frequency multiplication.

Does LMK04110SQ/NOPB support both single-ended and differential reference inputs?

Yes, the LMK04110SQ/NOPB supports AC- or DC-coupled single-ended and differential reference inputs on CLKin0/CLKin0*, CLKin1/CLKin1*, and OSCin/OSCin*. Single-ended operation requires grounding the complementary pin, while differential mode accepts LVDS, LVPECL, or HCSL signals - all with programmable input type selection per channel.

How does the SYNC* pin function in LMK04110SQ/NOPB?

The SYNC* pin on the LMK04110SQ/NOPB is an active-low asynchronous input that forces all enabled clock outputs (CLKout0–CLKout4) to realign their rising edges on the next valid clock cycle. This enables deterministic phase alignment across multiple devices or boards - essential for coherent beamforming in 5G massive MIMO and multi-channel oscilloscopes.

What VCO frequency range is specified for LMK04110SQ/NOPB?

The LMK04110SQ/NOPB is specified with an internal VCO frequency range of 1185 MHz to 1296 MHz. This range is factory-trimmed and calibrated to ensure stable lock across temperature and voltage variations, supporting exact synthesis of critical telecom frequencies like 122.88 MHz, 156.25 MHz, and 622.08 MHz via integer division without fractional spurs.

Can LMK04110SQ/NOPB generate LVCMOS outputs, and on which channels?

Yes, the LMK04110SQ/NOPB can generate LVCMOS outputs on CLKout0 and CLKout1 only - as confirmed in Table 2 of the SNAS516B datasheet. These two channels support LVCMOS format with 250 MHz max frequency and 28 mA drive strength, enabling direct interfacing with FPGAs, microcontrollers, and legacy logic without level-shifting components.