Texas Instruments LMH0324RTWR

Overview

LMH0324RTWR from Texas Instruments is a low-power, dual-output adaptive cable equalizer for SMPTE 3G/HD/SD-SDI video transport over 75-Ω coaxial cable. It supports data rates from 125 Mbps to 2.97 Gbps, delivers 78 mW typical power consumption at 1.8 V, provides two 100-Ω differential outputs with programmable de-emphasis, and integrates on-chip 75-Ω input termination and return loss compensation - enabling robust signal recovery in broadcast video routers and distribution amplifiers.

For engineers reviewing the LMH0324RTWR datasheet, LMH0324RTWR pinout, LMH0324RTWR application, or LMH0324RTWR equivalent, this page delivers verified technical context, exact pin functions per TI SNLS531B Rev B, confirmed cable reach (200 m @ 2.97 Gbps on Belden 1694A), real-world power save mode (15 mW), and validated alternative options for SDI equalizer upgrades.

Technical Context

The LMH0324RTWR implements an adaptive analog equalization architecture with closed-loop sensing that dynamically adjusts gain and DC offset based on input signal integrity and cable loss. Its equalizer operates across three SMPTE tiers (ST-424/292/259) and DVB-ASI, with automatic adaptation completed in ≤5 ms after signal detection.

It features dual independent 100-Ω output drivers supporting fan-out buffering, each configurable for amplitude (410–810 mV_p-p) and de-emphasis level via 4-level control pins or SPI/SMBus. Carrier detect (CD_N) provides open-drain status signaling, and internal LDO regulation enables single-supply operation from either 2.5 V or 1.8 V.

Key Specifications

Pinout & Package

LMH0324RTWR is housed in a 4.00 mm × 4.00 mm, 24-pin QFN package (RTW) with exposed thermal pad (EP = VSS). Pin assignment follows TI SNLS531B Rev B, with dedicated high-speed differential I/Os, 4-level control inputs, serial interface pins, and split power domains (VIN, VDDIO, VDD_LDO).

Key Features

Applications

Equivalent & Alternatives

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

Compared with LMH0324RTWR, LMH0384RTWR enables future-proof 12G-SDI migration but increases power and voltage complexity, while GS2971-IBE3 offers simpler integration at the cost of flexibility and advanced signal conditioning.

Availability

LMH0324RTWR is available at Aetrix Electronics and suitable for broadcast video routing, distribution amplification, and DVB-ASI transport requiring stable component supply, long-lifecycle assurance, and SMPTE-compliant signal integrity.

Supply support for LMH0324RTWR 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 and embedded processing technologies, with decades of leadership in broadcast video signal conditioning ICs.

The LMH0324RTWR belongs to TI's LMH high-speed video interface product line, engineered specifically for SMPTE-compliant SDI infrastructure - emphasizing low power, adaptive equalization, and seamless integration into professional video equipment.

FAQ

What data rates does the LMH0324RTWR support?

The LMH0324RTWR supports serial digital video data rates from 125 Mbps to 2.97 Gbps, fully covering SMPTE ST-259 (SD-SDI), ST-292 (HD-SDI), and ST-424 (3G-SDI), as well as DVB-ASI and AES10 (MADI) protocols. This range is verified per TI SNLS531B Rev B electrical characteristics and typical performance curves.

How does the LMH0324RTWR achieve low power consumption?

The LMH0324RTWR achieves low power via adaptive circuitry that powers down equalization blocks when no valid signal is detected, entering a 15 mW power save mode. At 1.8 V and 2.97 Gbps with one output active, it consumes only 78 mW typical - measured per TI's PRBS-10 test conditions in SNLS531B Rev B Section 6.5.

Can the LMH0324RTWR be used with both 1.8 V and 2.5 V supplies?

Yes, the LMH0324RTWR operates from a single supply of either 1.8 V ±5% or 2.5 V ±5%. When powered from 2.5 V, its internal LDO generates 1.8 V for core logic (VDD_LDO); when powered from 1.8 V, VIN and VDD_LDO are tied together. VDDIO must match or exceed VIN and is required at 2.5 V for SMBus operation.

What is the function of the CD_N pin on the LMH0324RTWR?

The CD_N pin on the LMH0324RTWR is an open-drain carrier detect output that pulls LOW after successful signal adaptation and remains LOW while a valid input is present. It is 3.3 V tolerant when VDDIO = 2.5 V and can drive LEDs or FPGA interrupts directly with an external pull-up resistor - as defined in TI SNLS531B Rev B Pin Functions table.

Is the LMH0324RTWR pin-compatible with other TI SDI equalizers?

Yes, the LMH0324RTWR is pin-compatible with the LMH1219 (12-Gbps adaptive equalizer with reclocker), enabling straightforward hardware upgrades. This compatibility is explicitly stated in TI SNLS531B Rev B Section 3 ("Description") and confirmed by identical RTW package footprint, shared pin numbering, and reserved pin assignments (e.g., RSV_L on Pin 13).