Texas Instruments LMH0031VS

Overview

LMH0031VS from Texas Instruments is an SMPTE 292M/259M digital video deserializer and descrambler IC that converts serial SDTV/HDTV video (270 Mbps–1.485 Gbps) into synchronized 10-bit or 20-bit parallel output, implements automatic video format detection, and integrates ancillary data FIFOs with masking and packet handling. It supports LSB de-dithering, built-in self-test (BIST), and video test pattern generation for broadcast equipment validation.

For engineers reviewing the LMH0031VS datasheet, LMH0031VS pinout, LMH0031VS application, or LMH0031VS equivalent, this device is selected for high-reliability SDI receiver design requiring auto-rate detection, EDH/CRC processing, low-jitter VCLK (±0.5 nsP-P at 74.25 MHz), and flexible ancillary data extraction in video editing systems, routers, and test equipment.

Technical Context

The LMH0031VS employs a CDR-based PLL architecture with sub-500 µs lock time at 1.485 Gbps, enabling rapid reacquisition after cable disconnects or signal interruptions. Its descrambler uses the X⁹+X⁴+1 reverse polynomial per SMPTE 259M/292M to convert NRZI to NRZ before parallel formatting.

Video path includes TRS character detection, LSB-clipping per ITU-R BT.601, and a configurable 4-deep FIFO for timing alignment; ancillary path supports SMPTE 291M-compliant Type 1/2 packets up to 259 words with maskable ID filtering and dual-channel (SD/HD) extraction logic.

Key Specifications

Pinout & Package

LMH0031VS is housed in a 64-pin TQFP (Package Number PAG0064A) with exposed thermal pad, optimized for thermal dissipation in high-speed video applications. Pin functions align with TI's SNLS218A datasheet revision April 2013.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar digital video deserializer applications.

Compared with LMH0031MT/NOPB, LMH0031VS offers identical functionality in a thermally enhanced TQFP package ideal for sustained 1.485 Gbps operation; versus GS2971-IBE3, it trades 12G-SDI readiness for lower system cost, integrated test capability, and simpler clocking - making it the preferred choice for established SDI infrastructure.

Availability

LMH0031VS is available at Aetrix Electronics and suitable for broadcast infrastructure, professional video routing, and digital video test equipment requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for LMH0031VS 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 high-performance signal chain solutions for industrial, automotive, and communications markets.

The LMH0031VS belongs to TI's broadcast video interface product line, engineered specifically for SMPTE-compliant SDI receiver applications in professional video equipment where reliability, auto-configuration, and embedded diagnostics are critical.

FAQ

What video standards does the LMH0031VS support?

The LMH0031VS supports SMPTE 259M (270 Mbps SD-SDI), SMPTE 344M (540 Mbps), and SMPTE 292M (1.483/1.485 Gbps HD-SDI). It auto-detects incoming data rate and raster format (e.g., SMPTE 274M, 296M) and configures parallel output, clock frequency (27–74.25 MHz), and FIFO depth accordingly - all without host software intervention.

Does the LMH0031VS require an external crystal oscillator?

Yes, the LMH0031VS requires a 27 MHz ±100 ppm crystal or clock source connected to XTALi/Ext Clk. This reference drives the PLL and CDR circuitry; the device does not include an internal oscillator. The 27 MHz input enables stable lock at all supported data rates, including 1.485 Gbps, with <500 µs acquisition time.

How is ancillary data handled by the LMH0031VS?

The LMH0031VS recovers SMPTE 291M-compliant ancillary data from horizontal and vertical blanking intervals, stores it in a 259-word FIFO, and outputs it via AD[9:0]. Filtering is controlled by maskable ANC ID bits and packet-type selection in configuration registers - allowing selective extraction of audio, timecode, or captioning data without host CPU overhead.

Can the LMH0031VS generate test patterns internally?

Yes, the LMH0031VS includes a built-in test pattern generator (TPG) that outputs standardized SD/HD colour bars, reference black, and pathological patterns directly on DV[19:0] and VCLK. These patterns comply with SMPTE timing tolerances and are used for BIST, eliminating external signal sources during production test or field diagnostics.

What is the purpose of the RREF and RBB pins on the LMH0031VS?

RREF (4.75 kΩ, 1%) sets the reference current for RBB, which provides a 200 µA bias current for AC-coupled SDI inputs. This eliminates the need for external bias resistors when terminating differential SDI lines - simplifying input circuit design and improving signal integrity in high-speed video interfaces.