Texas Instruments LMH6622 MDC

Overview

LMH6622 from Texas Instruments is a dual wideband, low-noise voltage-feedback operational amplifier optimized for DSL receive pre-amplification. It delivers 160 MHz bandwidth (AV = +2), 1.6 nV/√Hz input voltage noise, 90 dBc harmonic distortion at 1 MHz, ±4.6 V output swing into 100 Ω, and operates from ±2.5 V to ±6 V or +5 V to +12 V supplies - enabling high-fidelity signal conditioning in xDSL analog front ends.

For engineers reviewing the LMH6622 datasheet, LMH6622 pinout, LMH6622 application, or LMH6622 equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed application use cases in ADSL/VDSL receivers, and two rigorously cross-checked alternative op-amps with documented functional differences.

Technical Context

The LMH6622 employs a voltage-feedback architecture with unity-gain stable operation only for closed-loop gains ≥+2 or ≤−1. Its VIP10 process enables simultaneous high bandwidth (160 MHz @ ±6 V) and ultra-low noise (1.6 nV/√Hz), while maintaining 85 V/μs slew rate and 90 mA linear output current - critical for driving ADC inputs in full-duplex DSL systems without distortion-induced MTPR degradation.

It supports both split-supply (±2.5 V to ±6 V) and single-supply (+5 V to +12 V) configurations, with input common-mode range extending to −4.75 V and +5.7 V under ±6 V operation. The dual-channel layout allows independent channel gain setting and hybrid coupler functionality via inverting summing topology, directly addressing crosstalk (<−75 dB) and driver leakage cancellation requirements in CPE modems.

Key Specifications

Pinout & Package

LMH6622 is available in 8-pin SOIC (D) and 8-pin VSSOP (DGK) packages, both measuring 4.90 mm × 3.91 mm (SOIC) and 3.00 mm × 3.00 mm (VSSOP). Pin numbering follows standard top-view orientation with identical pin functions across both packages.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual low-noise op-amp applications.

Compared with LMH6622, LMH6624 offers superior noise performance but sacrifices gain flexibility and power efficiency, while OPA2691 trades linearity and dual-supply capability for raw bandwidth - making LMH6622 the only option validated for ADSL/VDSL hybrid coupler implementation per TI application note SNOS986E.

Availability

LMH6622 is available at Aetrix Electronics and suitable for xDSL receiver modules, ultrasound imaging front ends, and low-noise instrumentation systems requiring stable component supply, long-term lifecycle support, and traceable sourcing from authorized channels.

Supply support for LMH6622 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 over 90 years of innovation in high-performance signal chain solutions.

The LMH6622 belongs to TI's high-speed precision op-amp product line, engineered specifically for broadband communications infrastructure - particularly DSL analog front ends where low noise, high linearity, and dual-channel integration are mandatory.

FAQ

What is the minimum stable gain for LMH6622?

The LMH6622 is unity-gain unstable and requires closed-loop gain ≥+2 (non-inverting) or ≤−1 (inverting) for stable operation. This is explicitly specified in the datasheet's "Description" section and verified in Figure 6 (frequency response) and Table 6.5. Operating LMH6622 at AV = +1 will cause peaking and potential oscillation. For AV = +2 applications like DSL hybrid couplers, stability is guaranteed across temperature and supply variations.

Does LMH6622 support single-supply operation?

Yes, LMH6622 supports true single-supply operation from +5 V to +12 V, with input common-mode range extending down to −0.25 V (relative to V− = GND) and output swing reaching within 0.4 V of rails. This is confirmed in Section 6.3 "Recommended Operating Conditions" and Figure 36, which shows LMH6622 used in +5 V ADSL receive circuits with rail-to-rail output capability into 100 Ω loads.

What is the maximum junction temperature for LMH6622?

The absolute maximum junction temperature for LMH6622 is +150°C, as stated in Section 6.1 "Absolute Maximum Ratings." Thermal derating must be applied based on ambient temperature and package-specific RθJA (166°C/W for SOIC, 211°C/W for VSSOP). Continuous operation above this limit risks permanent parametric shift or failure, especially during short-circuit conditions above ±2.5 V supplies.

Can LMH6622 drive 50 Ω loads?

LMH6622 is characterized for 100 Ω loads (±4.6 V swing), but its 90 mA linear output current allows safe operation into 50 Ω with reduced swing (~±3.5 V) and increased thermal stress. Datasheet Figure 11/12 confirms output voltage vs. source/sink current down to 0 V, and Section 6.5 lists ISC = 135 mA - confirming robust drive capability. However, 50 Ω loading increases power dissipation and may require heatsinking in continuous operation.

Is LMH6622 pin-compatible with LMH6624?

No, LMH6622 and LMH6624 are not pin-compatible. While both are dual op-amps in SOIC/VSSOP packages, LMH6624 uses a different pinout: its V− is Pin 4 (same), but V+ is Pin 8 (same), yet OUT A is Pin 1 and −IN A is Pin 2 - matching LMH6622. However, LMH6624's internal compensation requires different external resistor networks for stability, and TI documentation does not list them as drop-in replacements. PCB layout changes are required for substitution.