Texas Instruments LMH0036SQ/NOPB

Overview

LMH0036SQ/NOPB from Texas Instruments is an SD-SDI reclocker with integrated 4:1 input multiplexer, designed for SMPTE 259M (C) compliant serial digital video systems operating at 270 Mbps. It suppresses accumulated jitter via PLL-based retiming, provides two differential LVPECL-compatible outputs, and supports DVB-ASI at identical data rate. Used in digital video routers, format converters, and broadcast infrastructure where signal integrity and timing stability are critical.

For engineers reviewing the LMH0036SQ/NOPB datasheet, LMH0036SQ/NOPB pinout, LMH0036SQ/NOPB application, or LMH0036SQ/NOPB equivalent, key selection considerations include its 48-pin WQFN package, dual-output flexibility (data + clock or dual data), 27 MHz crystal reference requirement, industrial temperature range (−40°C to +85°C), and support for DC-coupled LVPECL/CML interfaces with 100 Ω differential termination.

Technical Context

The LMH0036SQ/NOPB implements a PLL-based reclocking architecture with a 300 kHz loop bandwidth optimized for 270 Mbps SD-SDI signals. It recovers the embedded clock from any of four differential inputs selected by SEL0/SEL1, then regenerates low-jitter serial data and optionally a 270 MHz clock output aligned within ±10% of the data bit interval center.

Its dual differential outputs-SDO (primary data) and SCO/SDO2 (configurable)-are CML/LVPECL compatible and drive 100 Ω differentially terminated loads. Control logic (LVCMOS) enables auto/manual bypass, lock detection, SD-rate indication, and output muting-all with internal pull-up/pull-down resistors for default-safe operation.

Key Specifications

Pinout & Package

LMH0036SQ/NOPB is housed in a 48-pin WQFN (RHS0048A) package with an exposed die attach pad (DAP) electrically connected to VEE and serving as the primary ground terminal. Thermal resistance is θ_JA = 26.1°C/W; the package is RoHS-compliant and moisture-sensitivity level 3 (260°C peak reflow).

Key Features

Applications

Equivalent & Alternatives

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

Compared with LMH0056SQ/NOPB, LMH0036SQ/NOPB integrates multiplexing to reduce component count and interconnect complexity; versus LMH0356SQ/NOPB, it trades HD capability for lower cost, power, and design simplicity in SD-only systems.

Availability

LMH0036SQ/NOPB is available at Aetrix Electronics and suitable for digital video routers, broadcast signal processors, and DVB-ASI transport equipment requiring stable component supply across long production lifecycles and industrial temperature operation.

Supply support for LMH0036SQ/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, with deep expertise in broadcast and professional video signal conditioning.

The LMH0036SQ/NOPB belongs to TI's LMH video interface product line, engineered specifically for SMPTE-compliant serial digital video infrastructure where jitter suppression, signal integrity, and interoperability with TI's companion equalizers (LMH0074) and drivers (LMH0001) are essential.

FAQ

What is the primary function of the LMH0036SQ/NOPB in an SD-SDI signal chain?

The LMH0036SQ/NOPB functions as a jitter-reducing reclocker with integrated 4:1 input multiplexer for SMPTE 259M (C) 270 Mbps serial digital video. It recovers the embedded clock, suppresses accumulated jitter, and outputs regenerated low-jitter data-either as dual data streams or one data plus a precise 270 MHz clock-ensuring signal integrity for downstream processing. Its role is critical in maintaining eye diagram compliance across broadcast infrastructure.

Does the LMH0036SQ/NOPB require an external crystal, and what are the specifications?

Yes, the LMH0036SQ/NOPB requires a 27 MHz parallel-resonant crystal connected between XTAL IN/EXT CLK (pin 18) and XTAL OUT (pin 22). Per TI's datasheet SNLS254B, the crystal must have ±100 ppm frequency stability, 20 pF load capacitance, ≤40 Ω series resistance, and be operated in fundamental mode. Alternatively, a 27 MHz LVCMOS clock may be applied directly to XTAL IN/EXT CLK.

How does the SCO_EN pin affect the functionality of the LMH0036SQ/NOPB?

The SCO_EN pin (pin 37) configures the secondary output (SCO/SDO2, pins 28–29): when low (default, internal pulldown), it outputs retimed serial data; when high, it outputs a low-jitter 270 MHz serial data-rate clock. This flexibility allows the LMH0036SQ/NOPB to serve either as a dual-data fanout device or as a combined reclocker/clock generator-eliminating the need for discrete clock buffers in many SD-SDI designs.

Can the LMH0036SQ/NOPB operate with AC-coupled inputs, and what are the implications?

The LMH0036SQ/NOPB supports AC-coupled inputs only if an external bias network provides the required common-mode voltage (VEE + 1.2 V to VCC − 0.2 V). Its SDI inputs are not internally terminated or biased, so DC coupling is preferred-especially when interfacing with TI's LMH0074 equalizer, which delivers compatible common-mode and swing levels. AC coupling introduces risk of common-mode shift and reduced noise margin if biasing is inadequate.

What is the purpose of the LOCK DETECT and SD pins on the LMH0036SQ/NOPB?

LOCK DETECT (pin 24) is an active-high indicator that the PLL has acquired and locked to a valid 270 Mbps SD-SDI signal; it's commonly wired to OUTPUT MUTE to silence outputs during loss-of-signal. SD (pin 36) is a registered output that goes high only when locked to 270 Mbps-used to configure SD/HD mode on downstream devices like the LMH0002 cable driver. Both signals provide deterministic status feedback for system-level fault detection and mode control.