Texas Instruments LMH6672MAX

Overview

LMH6672MAX from Texas Instruments is a dual, high-speed, high-output-current voltage-feedback operational amplifier designed for xDSL line driver applications. It delivers ±200 mA output current at 9.6 VPP single-ended into 25 Ω, achieves 90 MHz −3 dB bandwidth (G = +2), and operates from ±2.5 V to ±6.5 V supplies - enabling robust ADSL PCI modem card and external xDSL modem designs.

For engineers reviewing the LMH6672MAX datasheet, LMH6672MAX pinout, LMH6672MAX application, or LMH6672MAX equivalent, key selection criteria include its 135 V/µs slew rate, −105 dBc SFDR at 100 kHz (8.4 VPP, RL = 25 Ω), rail-to-rail output swing capability (within 1 V of rails), low 3.1 nV/√Hz input noise, and SOIC-8 thermal performance with RθJA = 172 °C/W.

Technical Context

The LMH6672MAX uses a class AB output stage optimized for low-distortion driving of 25–100 Ω loads, supporting both single-ended and differential configurations. Its architecture enables stable operation at gains ≥ +2 V/V without external compensation while maintaining 98 dB SFDR at 1 MHz (2 VPP, RL = 100 Ω).

It features fully specified operation across −40°C to +150°C, with input common-mode range extending to ±6 V at ±6 V supplies and CMRR > 150 dB. The device draws only 7.2 mA per amplifier at ±6 V, balancing speed, drive strength, and power efficiency for telecom line drivers.

Key Specifications

Pinout & Package

LMH6672MAX is packaged in an 8-pin SOIC (D) with body size 4.89 mm × 3.90 mm and exposed pad not connected (floating). Thermal resistance is RθJA = 172 °C/W on standard JEDEC 2-layer board.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-output-current op amp applications.

Compared with LMH6672MAX, LMH6672MA/NOPB offers identical performance in tube packaging for flexibility, while LMH6672MR/NOPB provides superior thermal management via PowerPAD - making it preferable for high-power, high-reliability DSL line driver deployments.

Availability

LMH6672MAX is available at Aetrix Electronics and suitable for ADSL PCI modem cards, xDSL external modems, and DSL line drivers requiring stable component supply, long-term lifecycle assurance, and traceable sourcing for production programs.

Supply support for LMH6672MAX 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 expertise in high-speed op amps and telecom interface solutions.

The LMH6672MAX belongs to TI's high-output-current, high-speed op amp product line - engineered specifically for xDSL line driver applications demanding high fidelity, high drive strength, and robust thermal performance in industrial temperature ranges.

FAQ

What is the maximum output voltage swing of LMH6672MAX into a 25 Ω load?

The LMH6672MAX delivers ±4.8 V output swing into a 25 Ω load at ±6 V supplies, achieving 9.6 VPP single-ended output. This rail-to-rail capability - within 1 V of each supply rail - enables maximum dynamic range for DSL line driver applications without requiring elevated supply voltages. The LMH6672MAX maintains this performance across −40°C to +125°C.

Does LMH6672MAX require external compensation for stability?

No, the LMH6672MAX is internally compensated and stable for gains of +2 V/V or higher. It does not require external compensation components in standard non-inverting or inverting configurations. This simplifies PCB layout and reduces bill-of-materials cost compared to decompensated high-speed op amps that mandate careful external network design.

Can LMH6672MAX operate from a single 5 V supply?

Yes, the LMH6672MAX supports single-supply operation from 5 V (i.e., V+ = 5 V, V− = 0 V), with input common-mode range extending down to ground and output swing reaching within 1 V of either rail. For single-supply use, biasing the inputs above ground (e.g., via VCM reference) is required to maintain linear operation - as confirmed in the LMH6672MAX datasheet's recommended operating conditions.

What is the thermal resistance (RθJA) of the LMH6672MAX package?

The LMH6672MAX uses an SOIC-8 (D) package with a junction-to-ambient thermal resistance (RθJA) of 172 °C/W on a standard 2-layer JEDEC test board. This value assumes proper PCB layout with adequate copper pour and thermal vias. At 7.2 mA per amplifier and ±6 V supplies, quiescent power dissipation is ~173 mW, resulting in ~30°C junction rise above ambient under typical conditions.

How does LMH6672MAX compare to LMH6672MR/NOPB in terms of thermal performance?

The LMH6672MAX (SOIC-8) has RθJA = 172 °C/W, while LMH6672MR/NOPB (SO PowerPAD) achieves RθJA = 58.6 °C/W - a 66% reduction. This allows the MR variant to sustain higher continuous output power before reaching the 150°C max junction temperature. Both share identical electrical specifications; the choice depends on thermal budget and PCB thermal design capability.