Texas Instruments LMH0031VS-TI

Overview

LMH0031VS-TI from Texas Instruments is an SMPTE 292M/259M digital video deserializer/descrambler IC that converts 1.485 Gbps HD or 270 Mbps SD serial digital video into synchronized 20-bit or 10-bit parallel data. It performs clock/data recovery, NRZI-to-NRZ conversion, CRC/EDH checking, ancillary data extraction, and auto-detects video format (SMPTE 274M, 296M, 125M, etc.). It is used in broadcast-grade video routers, standards converters, and digital video test equipment.

For engineers reviewing the LMH0031VS-TI datasheet, LMH0031VS-TI pinout, LMH0031VS-TI application, or LMH0031VS-TI equivalent, key selection considerations include its dual-rate SD/HD support (270 Mbps–1.485 Gbps), on-chip 4-deep video FIFO for timing alignment, built-in BIST/TPG for production test, LVDS/ECL-compatible serial inputs, and LVCMOS-compatible parallel outputs with auto-format detection.

Technical Context

The LMH0031VS-TI implements a CDR-based PLL with sub-500 µs lock time at 1.485 Gbps and supports both SMPTE 259M (SD) and SMPTE 292M (HD) standards with automatic rate and raster detection. Its descrambler uses the X⁹+X⁴+1 polynomial and includes LSB de-dithering for vertical blanking interval data.

It integrates dual-path processing: a primary video path delivering aligned DV[19:0] output with VCLK (27–74.25 MHz), and a configurable ancillary data path with 259-word FIFO, masking, and ID-based packet filtering per SMPTE 291M. The multi-function I/O port enables real-time access to register-mapped indicators and controls without host bus overhead.

Key Specifications

Pinout & Package

LMH0031VS-TI is housed in a 64-pin TQFP (NS package VEC-64A) with exposed thermal pad. Pin functions are defined per National Semiconductor DS201796 Rev. January 2006, including dedicated SDI±, DV[19:0], VCLK, ACLK, RD/WR, ANC/CTRL, RREF/RBB bias references, and multi-function I/O pins IO0–IO7.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LMH0031WVS/NOPB, LMH0031VS-TI offers identical functionality in non-RoHS packaging, while GS2971-IBE3 extends capability to 3G-SDI and IP video but removes integrated test features - making LMH0031VS-TI the preferred choice where BIST-driven production test and legacy process compatibility are critical.

Availability

LMH0031VS-TI is available at Aetrix Electronics and suitable for broadcast video routing, digital standards conversion, and studio-grade test equipment requiring stable component supply and long-term obsolescence management.

Supply support for LMH0031VS-TI 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 acquired National Semiconductor in 2011 and maintains full technical and supply chain support for legacy broadcast video ICs.

The LMH0031VS-TI belongs to TI's professional video interface portfolio, designed specifically for SMPTE-compliant SD/HD-SDI deserialization in broadcast infrastructure, post-production, and test equipment where signal integrity, auto-configuration, and on-chip diagnostics are essential.

FAQ

What video standards does the LMH0031VS-TI support?

The LMH0031VS-TI supports SMPTE 259M (270/360 Mbps SD), SMPTE 344M (540 Mbps), and SMPTE 292M (1.483/1.485 Gbps HD) serial digital video standards. It auto-detects raster formats including SMPTE 125M, 267M, 274M, 295M, and 296M, and handles NRZI-to-NRZ conversion, TRS alignment, and EDH/CRC checking per specification. The LMH0031VS-TI does not support 3G-SDI (SMPTE 424M) or higher rates.

Does the LMH0031VS-TI require an external crystal or can it use a clock oscillator?

The LMH0031VS-TI supports both a 27 MHz crystal (XTALi/XTALo pins) and a 27 MHz CMOS clock oscillator input. The device uses this reference for PLL stabilization and CDR operation. Frequency tolerance must be within ±100 ppm, and the LMH0031VS-TI's fast lock time (<500 µs at 1.485 Gbps) ensures rapid synchronization even after hot-plug events.

How is ancillary data handled in the LMH0031VS-TI?

The LMH0031VS-TI extracts ancillary data from horizontal and vertical blanking intervals per SMPTE 291M, storing it in a 259-word on-chip FIFO. Access is controlled via AD[9:0] port using ANC/CTRL and ACLK, with filtering enabled by mask and ID registers. Ancillary data is output separately from parallel video (DV[19:0]), preserving luma/chroma integrity while enabling isolated AES3 audio or metadata packet retrieval.

What power supply configuration does the LMH0031VS-TI require?

The LMH0031VS-TI requires two independent supplies: +3.3 V (±3%) for I/O circuits (VDDIO, VDDSI) and +2.5 V (±5%) for core logic and PLL (VDDD, VDDPLL). This separation minimizes noise coupling between high-speed serial inputs and sensitive clock recovery circuitry. Total typical power dissipation is 850 mW at 1.485 Gbps, with thermal resistance θJA = 40.1°C/W at 0 LFM airflow.

Can the LMH0031VS-TI generate test patterns for system validation?

Yes, the LMH0031VS-TI includes an integrated video Test Pattern Generator (TPG) and Built-In Self-Test (BIST) engine. It outputs SD and HD color bar patterns (including 75% saturation 8-bar), reference black, and pathological signals for PLL and EQ validation. TPG data is delivered via the DV[19:0] parallel port, enabling end-to-end signal path verification without external equipment - a key capability of the LMH0031VS-TI for manufacturing test.