Texas Instruments LMH0356SQE-40/NOPB

Overview

LMH0356SQE-40/NOPB from Texas Instruments is a 3-Gbps HD/SD SDI reclocker with integrated 4:1 input multiplexer and four independent FR4 equalizers, supporting SMPTE ST-259 (270 Mbps), ST-292 (1.483/1.485 Gbps), and ST-424 (2.967/2.97 Gbps) standards. It delivers two differential LVPECL-compatible outputs-one fixed data output and one configurable as either retimed data or recovered clock-with lock detect, auto/manual bypass, and output mute functions for broadcast video routing and processing systems.

For engineers reviewing the LMH0356SQE-40/NOPB datasheet, LMH0356SQE-40/NOPB pinout, LMH0356SQE-40/NOPB application, or LMH0356SQE-40/NOPB equivalent, this device serves as a jitter-suppressing reclocking solution for multi-source SDI infrastructure where signal integrity across long FR4 traces, rate agility, and dual-output flexibility are critical in digital video switchers, format converters, and DVB-ASI equipment.

Technical Context

The LMH0356SQE-40/NOPB implements a PLL-based retiming architecture with VCO and dual loop filters (LF1/LF2) to suppress accumulated jitter across five discrete serial data rates. Its automatic rate detection logic identifies incoming 270/1483/1485/2967/2970 Mbps streams without external configuration, while manual RATE0/RATE1 inputs allow fixed-rate operation-including DVB-ASI at 270 Mbps.

Each of the four differential SDI inputs includes a programmable FR4 equalizer compensating up to 30 inches of trace loss; the 4:1 mux selects one active channel via SEL0/SEL1. The SCO/SDO2 output is dynamically reconfigurable between second retimed data and low-jitter recovered clock (270/1483/1485/2967/2970 MHz), controlled by SCO_EN and synchronized to data bit intervals within ±10% of center alignment.

Key Specifications

Pinout & Package

The LMH0356SQE-40/NOPB uses a 40-pin WQFN package (5.0 mm × 5.0 mm) with exposed die attach pad electrically connected to VEE (ground). All power and signal pins are arranged for optimal high-speed SDI signal routing and thermal dissipation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LMH0356SQ/NOPB, the LMH0356SQE-40/NOPB offers identical core functionality in a smaller 5-mm WQFN package but with fewer power pins and no NC terminals-ideal for space-constrained video modules. Unlike LMH0344RTWT, it provides full retiming, clock recovery, and output flexibility essential for end-to-end SDI signal regeneration.

Availability

LMH0356SQE-40/NOPB is available at Aetrix Electronics and suitable for digital video routers, broadcast production equipment, and DVB-ASI infrastructure requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for LMH0356SQE-40/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 company specializing in analog and embedded processing technologies, with leadership in high-speed interface solutions for professional video and communications markets.

The LMH0356 product line delivers SMPTE-compliant SDI reclockers optimized for broadcast-grade video signal integrity, targeting digital video routing, switching, and processing equipment where jitter suppression and multi-rate flexibility are mandatory.

FAQ

What video standards does the LMH0356SQE-40/NOPB support?

The LMH0356SQE-40/NOPB supports SMPTE ST-259 (270 Mbps SD-SDI), ST-292 (1.483/1.485 Gbps HD-SDI), and ST-424 (2.967/2.97 Gbps 3G-SDI), plus DVB-ASI at 270 Mbps. It automatically detects and locks to these exact rates without harmonic locking, and rejects unsupported rates like 143 Mbps or 360 Mbps by entering bypass mode. This behavior is confirmed in the official TI datasheet SNLS270L.

How does the LMH0356SQE-40/NOPB handle input signal degradation over long PCB traces?

The LMH0356SQE-40/NOPB integrates four independent FR4 equalizers-one per SDI input-that compensate for loss across 0 to 30 inches of FR4 trace without external components or configuration. Each equalizer adapts to the incoming data rate and signal integrity, enabling robust operation even with marginal eye openings. This capability is explicitly documented in the "Features" and "Detailed Description" sections of the LMH0356SQE-40/NOPB datasheet.

Can the second output of the LMH0356SQE-40/NOPB be used as a clock source?

Yes-the SCO/SDO2 output pair of the LMH0356SQE-40/NOPB can be configured as a low-jitter recovered clock output via the SCO_EN control pin. When SCO_EN is high, it delivers a differential clock aligned to the data bit interval within ±10% of center, at frequencies matching the detected rate (270/1483/1485/2967/2970 MHz). This clock meets jitter requirements for synchronous downstream logic and is validated in AC Electrical Characteristics Table 7.6.

What is the power consumption profile of the LMH0356SQE-40/NOPB in active and standby modes?

The LMH0356SQE-40/NOPB consumes 430 mW typical in active operation at 2970 Mbps and drops to 10 mW typical in power-saver mode when ENABLE is low. In disabled state, internal circuitry powers down while XTAL IN/EXT CLK and XTAL OUT remain active to sustain the 27-MHz reference for cascaded devices. These values are specified in the "Features" section and DC Electrical Characteristics table of the LMH0356SQE-40/NOPB datasheet.

Does the LMH0356SQE-40/NOPB require an external crystal, or can it accept a clock signal?

The LMH0356SQE-40/NOPB accepts either a 27-MHz parallel-resonant crystal connected between XTAL IN/EXT CLK and XTAL OUT, or a 27-MHz LVCMOS-compatible external clock signal applied to XTAL IN/EXT CLK with XTAL OUT left unconnected. Both configurations are supported per the "Crystal or External Clock Reference" subsection in the datasheet's Feature Description, and the device maintains ±50 ppm reference tolerance in either case.