Texas Instruments LMH0036SQE/NOPB

Overview

LMH0036SQE/NOPB from Texas Instruments is a 270 Mbps SD-SDI reclocker with integrated 4:1 input multiplexer, differential LVPECL/CML-compatible serial data I/O, and dual retimed outputs - one fixed SDO and one configurable SCO/SDO2 (data or 270 MHz clock). It operates from a single 3.3 V supply, consumes 360 mW typical, and targets SMPTE 259M-compliant digital video routing and DVB-ASI equipment.

For engineers reviewing the LMH0036SQE/NOPB datasheet, LMH0036SQE/NOPB pinout, LMH0036SQE/NOPB application, or LMH0036SQE/NOPB equivalent, key selection criteria include jitter suppression performance (0.02–0.08 UI_P-P output jitter), 4-channel SDI input selection via SEL0/SEL1, lock detect and SD indicator outputs, and WQFN-48 package compatibility with LMH0056/LMH0356.

Technical Context

The LMH0036SQE/NOPB implements a PLL-based reclocking architecture with 300 kHz loop bandwidth and supports auto-bypass when unlocked or presented with unsupported data rates. Its internal VCO locks to incoming 270 Mbps SD-SDI or DVB-ASI streams using a 27 MHz crystal or external reference.

It features two differential CML outputs: SDO (fixed retimed data) and SCO/SDO2 (user-selectable via SCO_EN as second data output or low-jitter 270 MHz clock aligned within ±10% of data bit interval center). Input jitter tolerance exceeds 0.6 UI_P-P per SMPTE RP 184 A2.

Key Specifications

Pinout & Package

LMH0036SQE/NOPB is housed in a 48-pin WQFN (RHS0048A) package with exposed thermal pad (DAP) electrically connected to VEE. The package is footprint-compatible with LMH0056 and LMH0356.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar SD-SDI reclocking applications.

Compared with LMH0056SQE/NOPB and LMH0356SQE/NOPB, the LMH0036SQE/NOPB uniquely delivers integrated 4:1 SDI multiplexing at 270 Mbps with dual configurable outputs - making it the sole option for compact, self-contained SD-SDI reclocking and source selection in broadcast edge devices.

Availability

LMH0036SQE/NOPB is available at Aetrix Electronics and suitable for digital video routers, DVB-ASI transport equipment, and SD-SDI standards converters requiring stable component supply and long-term industrial temperature support.

Supply support for LMH0036SQE/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 connectivity technologies for industrial, automotive, and communications markets.

The LMH0036SQE/NOPB belongs to TI's high-speed video interface product line, designed specifically for SMPTE-compliant serial digital video signal conditioning, jitter reduction, and source multiplexing in broadcast infrastructure.

FAQ

What is the primary function of the LMH0036SQE/NOPB in an SD-SDI signal chain?

The LMH0036SQE/NOPB functions as a jitter-suppressing reclocker with integrated 4:1 input multiplexer for 270 Mbps SD-SDI and DVB-ASI signals. It retimes incoming serial data using a PLL locked to a 27 MHz reference, producing two low-jitter differential outputs - one fixed SDO and one configurable SCO/SDO2 - to restore signal integrity in broadcast video routing and processing equipment. The LMH0036SQE/NOPB is essential for maintaining SMPTE 259M compliance after signal degradation over long coaxial cables.

Does the LMH0036SQE/NOPB support automatic rate detection or only fixed 270 Mbps operation?

The LMH0036SQE/NOPB is designed exclusively for 270 Mbps operation per SMPTE 259M (C) and DVB-ASI standards. It does not perform automatic rate detection across multiple data rates. Its PLL is optimized for 270 Mbps lock; if presented with an unsupported rate, it enters auto-bypass mode (when BYPASS/AUTO BYPASS is low) or remains unlocked. The SD output pin asserts only when locked to 270 Mbps, confirming correct rate acquisition. The LMH0036SQE/NOPB requires a stable 27 MHz reference and does not adapt to other SDI variants like HD-SDI or 3G-SDI.

How is the second output (SCO/SDO2) configured on the LMH0036SQE/NOPB?

The second output (pins 28 and 29) is configured via the SCO_EN pin (pin 37): when SCO_EN is logic low (default, due to internal pulldown), SCO/SDO2 functions as a second retimed serial data output; when SCO_EN is logic high, it outputs a low-jitter 270 MHz serial data-rate clock aligned within ±10% of the data bit interval center. This clock output is usable for synchronization of downstream devices such as cable drivers or ADCs. The LMH0036SQE/NOPB does not support simultaneous dual-data output - SCO/SDO2 is strictly either data or clock, not both.

What are the power supply requirements and thermal considerations for the LMH0036SQE/NOPB?

The LMH0036SQE/NOPB requires a single 3.3 V ±5% supply (VCC–VEE) with typical power consumption of 360 mW. It uses multiple VCC (pins 3, 6, 12, 14, 30, 31, 34, 35) and VEE (DAP + pins 13, 17, 19–21, 23, 25–27, 38–42) connections; the exposed die attach pad (DAP) is the primary thermal and electrical ground path and must be soldered to a large PCB copper pour. With θ_JA = 26.1°C/W, proper thermal layout is essential for operation across −40°C to +85°C. The LMH0036SQE/NOPB is not rated for extended high-temperature operation beyond its specified industrial range.

Can the LMH0036SQE/NOPB be used with AC-coupled SDI inputs, or is DC coupling required?

The LMH0036SQE/NOPB supports both AC- and DC-coupled SDI inputs, but DC coupling is preferred and recommended. Its differential inputs have a wide common-mode range (VEE+1.2 V to VCC−0.2 V), enabling direct interface with DC-coupled equalizers like the LMH0074 without external biasing. If AC coupling is used, an external bias network must be added to maintain the input common-mode voltage within specification - failure to do so risks loss of lock or increased jitter. The LMH0036SQE/NOPB datasheet provides reference schematics for both configurations, but DC coupling simplifies design and improves jitter performance.