Texas Instruments THS6226AIRHBT

Overview

THS6226AIRHBT from Texas Instruments is a dual-port, gated-class H, current-feedback differential line driver IC designed for VDSL2 line driver systems. It delivers 40 VPP differential output swing into 60 Ω with 1:1.4 transformer, supports up to 20.5 dBm line power (G.993.2 Profile 8b), and features digitally adjustable quiescent current (7.6–23 mA per port) for adaptive power optimization in xDSL infrastructure.

For engineers reviewing the THS6226AIRHBT datasheet, THS6226AIRHBT pinout, THS6226AIRHBT application, or THS6226AIRHBT equivalent, this device is critical for high-linearity, low-distortion DSL central office and remote terminal line card designs requiring dynamic bias control, active impedance matching, and dual-channel profile flexibility across ADSL2+ to VDSL2 30 MHz operation.

Technical Context

The THS6226AIRHBT implements a dual independent class H architecture with integrated charge pumps (VLL/VHH/CAPL/CAPH per port), enabling ±5.5 V to ±17.5 V output voltage rails beyond the 12-V supply-critical for high-PAR VDSL2 signals. Each port operates with fixed 19 V/V gain and active feedback-based output impedance control via FB_A/FB_B (AB port) and FB_C/FB_D (CD port).

It integrates a two-wire serial interface (CLK/DATA) for digital bias programming, RESET for register initialization, and independent VH_ENAB/VH_ENCD pins to enable/disable class H mode per port-allowing mixed AB/H operation, line termination mode (7 mA/quiescent), and full capacitor recharge in 200 µs.

Key Specifications

Pinout & Package

VQFN-32 PowerPAD™ package (5.00 mm × 5.00 mm); thermally enhanced exposed die pad electrically isolated and intended for connection to PCB ground plane via multiple vias.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-port VDSL2 line driver applications.

Compared with THS6226AIRHBT, THS6216IRHBT provides identical per-port performance but requires duplication for dual-channel use, while LMH6882IRHAT offers broader bandwidth at the cost of missing DSL-specific features-making THS6226AIRHBT the only single-package, standards-compliant dual-port solution for production VDSL2 line cards.

Availability

THS6226AIRHBT is available at Aetrix Electronics and suitable for VDSL2 central office line cards, remote terminal units, and ADSL2++ backward-compatible DSLAM upgrades requiring stable component supply, long-term lifecycle assurance, and traceable sourcing for telecom infrastructure programs.

Supply support for THS6226AIRHBT 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 connectivity technologies for industrial, automotive, and communications markets.

The THS6226AIRHBT belongs to TI's high-performance line driver product line, engineered specifically for xDSL infrastructure-delivering class H efficiency, programmable bias, and active impedance control to meet G.993.2 VDSL2 spectral mask and MTPR requirements.

FAQ

What is the maximum output power and supported VDSL2 profile for THS6226AIRHBT?

The THS6226AIRHBT supports up to 20.5 dBm line power compliant with ITU-T G.993.2 VDSL2 Profile 8b (up to 8.5 MHz) and 14.5 dBm for Profile 17a/30 (up to 30 MHz). Its 40 VPP differential swing into 60 Ω with 1:1.4 transformer enables these profiles under full bias conditions while maintaining –83 dBc HD3 distortion at 1 MHz.

How does the class H operation improve efficiency in THS6226AIRHBT compared to class AB mode?

In class H mode, THS6226AIRHBT uses integrated charge pumps to generate ±8 V auxiliary rails, extending output swing to ±17.5 V/∓5.5 V-enabling higher peak signal levels without increasing average supply current. This reduces power consumption by ~40% versus class AB at equivalent line power, especially critical for multi-profile DSLAMs operating across varying loop lengths.

Can THS6226AIRHBT be used in ADSL2++ systems, and what performance does it deliver?

Yes, THS6226AIRHBT is backward-compatible with ADSL2++ systems. It delivers 19.8 dBm MTPR performance meeting G.992.5 Annex M requirements, with 6.5 nV/√Hz input-referred voltage noise and –87 dBc HD2 distortion at 1 MHz-ensuring clean upstream signal integrity and full compliance without hardware modification.

What is the function of the FB_A, FB_B, FB_C, and FB_D pins on THS6226AIRHBT?

The FB_A/FB_B pins configure active output impedance for the AB port, and FB_C/FB_D do the same for the CD port. When used with external resistor networks, they establish precise 100-Ω differential line termination-minimizing signal reflections, improving return loss, and eliminating the need for passive termination resistors that degrade high-frequency performance in VDSL2 systems.

Does THS6226AIRHBT support independent bias control for each of its two ports?

Yes, THS6226AIRHBT supports fully independent bias control per port via its two-wire serial interface (CLK/DATA) and dedicated VH_ENAB/VH_ENCD pins. Each port can be set to different bias levels (0–15), operate in class H or class AB, or enter line termination mode-enabling asymmetric configuration for mixed-profile deployments or fault-isolated operation.