Texas Instruments LMK03806BISQE/NOPB

Overview

LMK03806BISQE/NOPB from Texas Instruments is an ultra-low-jitter clock generator IC with 14 programmable differential or single-ended outputs, integrated integer-N PLL and 2.37–2.6 GHz VCO, delivering <43 fs RMS jitter at 312.5 MHz (1.875–20 MHz integration) in LVPECL mode, operating from 3.15–3.45 V over –40°C to +85°C, and used for multi-gigabit serial interface clocking in telecom and datacom line cards.

For engineers reviewing the LMK03806BISQE/NOPB datasheet, LMK03806BISQE/NOPB pinout, LMK03806BISQE/NOPB application, or LMK03806BISQE/NOPB equivalent, this page provides verified technical context, real-world timing performance metrics, package-validated pin functions, confirmed alternative options, and supply-chain support details specific to the WQFN-64 variant.

Technical Context

The LMK03806BISQE/NOPB implements a high-performance integer-N PLL architecture with a tunable 2.37–2.6 GHz VCO and programmable output dividers, enabling synthesis of up to eight unique frequencies across its 14 outputs. It supports crystal (6–20.5 MHz) or external clock (up to 500 MHz) reference inputs with AC-coupled differential or single-ended interfaces.

All 14 outputs are independently configurable as LVDS, LVPECL (700/1200/1600/2000 mVpp), or LVCMOS, with dedicated power domains per clock group (Vcc1–Vcc13) and low skew: ≤30 ps between same-format outputs at 800 MHz. The device uses MICROWIRE (CLKuWire/LEuWire/DATAuWire) for register programming and includes SYNC input for deterministic phase alignment.

Key Specifications

Pinout & Package

LMK03806BISQE/NOPB is housed in a thermally enhanced 64-pin WQFN package (9.0 mm × 9.0 mm) with exposed die attach pad (DAP) for PCB-level thermal management. Power domains are segmented by clock group (Vcc1–Vcc13), and all 14 clock outputs are differential pairs (e.g., CLKout0/CLKout0*).

Key Features

Applications

Equivalent & Alternatives

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

Compared with LMK04832RTAR and Si5341-B-GM, the LMK03806BISQE/NOPB uniquely combines on-chip crystal oscillation, 14 fully programmable outputs with LVPECL support, and sub-50-fs jitter - making it optimal for cost-constrained, high-channel-count telecom clock trees where external XO elimination and backplane drive capability are critical.

Availability

LMK03806BISQE/NOPB is available at Aetrix Electronics and suitable for telecom infrastructure, high-speed data converter timing, and network processor clocking requiring stable component supply across extended product lifecycles.

Supply support for LMK03806BISQE/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, with decades of expertise in high-performance timing devices for communications and industrial markets.

The LMK03806BISQE/NOPB belongs to TI's LMK ultra-low-jitter clock generator family, designed specifically for multi-gigabit serial interface clocking in SONET/SDH, Ethernet, Fibre Channel, and wireless infrastructure where phase noise and inter-channel skew directly impact system BER and throughput.

FAQ

What is the maximum output frequency supported by LMK03806BISQE/NOPB in LVDS mode?

The LMK03806BISQE/NOPB supports up to 1.3 GHz on LVDS outputs (CLKoutX_TYPE = 1) under 100-Ω differential termination and 3.3-V supply. This specification is validated per electrical characteristics table 5.5, with rise/fall times ≤200 ps and output voltage swing of 250–450 mV differential. Performance remains stable across –40°C to +85°C ambient.

Does LMK03806BISQE/NOPB integrate a crystal oscillator circuit?

Yes, the LMK03806BISQE/NOPB includes an on-chip crystal oscillator supporting fundamental-mode crystals from 6 MHz to 20.5 MHz (with CL ≤22 pF and RESR ≤80 Ω). It eliminates the need for an external XO, reducing system cost and board space. Crystal drive level is limited to 120 µW for Vectron VXB1-type crystals, as specified in section 5.5.

How many independent frequency synthesis paths does LMK03806BISQE/NOPB provide?

The LMK03806BISQE/NOPB provides up to eight independent synthesized frequencies across its 14 outputs. Each frequency is generated via programmable integer-N PLL dividers and output dividers, allowing distinct rates such as 100 MHz, 156.25 MHz, 312.5 MHz, and 622.08 MHz simultaneously - confirmed in the device description and functional block diagram (SNAS522K).

What is the guaranteed RMS jitter performance of LMK03806BISQE/NOPB at 312.5 MHz?

The LMK03806BISQE/NOPB guarantees <43 fs RMS jitter at 312.5 MHz output in LVPECL mode with 1.875–20 MHz integration bandwidth, and <57 fs in LVDS mode under identical conditions. These values are measured per JEDEC-standard methods and published in Table 5.5 of the official datasheet (SNAS522K, December 2023 revision).

Which communication protocols and standards is LMK03806BISQE/NOPB commonly used to support?

The LMK03806BISQE/NOPB is explicitly applied in ultra-high-speed serial interfaces including SONET/SDH OC-192, 10GBASE-R, 25G/100G Ethernet (XAUI, CAUI), Fibre Channel 16GFC, PCIe Gen3/Gen4, SAS-3, SATA-3, CPRI, and JESD204B - as documented in Section 2 "Applications" and system examples in the TI datasheet SNAS522K.