Texas Instruments THS6226AIRHBR

Overview

THS6226AIRHBR 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 383 mA output current, supports G.993.2 Profile 8b (20.5 dBm), and operates on +12-V supply with digitally adjustable quiescent current (9.4–24.8 mA). It enables high-linearity transmission up to 8.5 MHz in customer-premises equipment.

For engineers reviewing the THS6226AIRHBR datasheet, THS6226AIRHBR pinout, THS6226AIRHBR application, or THS6226AIRHBR equivalent, key selection considerations include its dual-channel class H architecture, programmable bias current via 2-wire serial interface, active impedance matching capability, and VQFN-32 PowerPAD™ thermal performance under high-dynamic-range xDSL signals.

Technical Context

The THS6226AIRHBR integrates two independent class H amplifier channels (AB and CD), each with dedicated charge-pump supplies (VLL/VHH, CAPL/CAPH), digital bias control (via CLK/DATA), and active output impedance feedback (FB_A–FB_D). Its current-feedback topology enables 97 MHz small-signal bandwidth and 1750 V/μs slew rate while maintaining –83 dBc HD3 at 1 MHz.

Operation spans class AB (±137 mA, 10–15 V supply) and class H (±383 mA, 10–12.6 V supply) modes, with digitally selectable quiescent current (16 steps, 1 mA/step) and line termination mode (7 mA per port). Port-to-port separation exceeds 90 dB at 1 MHz, and PSRR is 70 dB at 1 MHz for noise immunity in multi-port DSLAM environments.

Key Specifications

Pinout & Package

VQFN-32 PowerPAD™ package with exposed thermal pad (electrically isolated, typically connected to PCB ground plane via multiple vias). Pin 1 is top-left corner (RESET), pin count proceeds counter-clockwise. PowerPAD must be soldered for thermal compliance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with THS6226AIRHBR, THS6216IRHBR halves channel density but retains identical per-port performance and thermal design, while MAX22026ETP+ trades output drive and class H capability for lower voltage operation and integrated DAC control - making it unsuitable for full-profile VDSL2 line cards.

Availability

THS6226AIRHBR is available at Aetrix Electronics and suitable for VDSL2 central office line cards, residential gateway CPE, ADSL2+ backward-compatible modems, and multi-standard xDSL test equipment requiring stable component supply across extended product lifecycles.

Supply support for THS6226AIRHBR 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 solutions for industrial, communications, and automotive markets.

The THS6226AIRHBR belongs to TI's high-speed line driver product line, engineered specifically for xDSL infrastructure applications demanding high output current, wide dynamic range, and programmable power efficiency in space-constrained designs.

FAQ

What is the maximum output voltage swing supported by the THS6226AIRHBR?

The THS6226AIRHBR supports a differential output voltage swing of 40 VPP into a 60-Ω load with a 1:1.4 transformer, achieved through its integrated class H charge pump. In class H mode, this corresponds to –5.5 V to +17.5 V per output terminal relative to ground, enabling compliance with G.993.2 VDSL2 Profile 8b (20.5 dBm) line power requirements. The THS6226AIRHBR maintains this swing across temperature (–40°C to +85°C) when capacitors are fully charged.

How does the THS6226AIRHBR achieve programmable quiescent current?

The THS6226AIRHBR implements digitally adjustable quiescent current via a 2-wire serial interface (CLK/DATA pins) that configures an internal 4-bit register controlling bias current in 1 mA steps from 9.4 mA to 24.8 mA per port. This register also controls class H enable/disable and line termination mode. The THS6226AIRHBR supports hardware override using VH_ENAB/VH_ENCD pins for deterministic startup behavior independent of serial programming.

Can the THS6226AIRHBR operate in both class AB and class H modes simultaneously on different ports?

Yes - the THS6226AIRHBR supports independent operation modes per port. Port AB can be configured in class H mode (using VH_ENAB high and VLL_AB/VHH_AB supplies) while port CD operates in class AB mode (VH_ENCD low, VSAB/VSCD only), or vice versa. Each port has dedicated charge-pump supplies and enable pins, allowing mixed-mode deployment for heterogeneous line-length scenarios within a single device. The THS6226AIRHBR maintains full specification compliance in either configuration.

What is the role of the FB_A–FB_D pins on the THS6226AIRHBR?

The FB_A, FB_B, FB_C, and FB_D pins on the THS6226AIRHBR provide feedback for active output impedance control. When connected to the internal 10.2-Ω reference resistor network, they configure the amplifier to present a precise 100-Ω differential output impedance to the line - minimizing reflections and improving return loss beyond passive termination. This function is active in both class AB and class H modes and is essential for meeting G.993.2 MTPR and spectral mask requirements. The THS6226AIRHBR requires no external components for this feature.

Is the THS6226AIRHBR pin-compatible with earlier revisions or alternate suffixes?

The THS6226AIRHBR is the production-grade, tape-and-reel packaged variant in the THS6226A family and shares identical pinout, electrical specifications, and thermal characteristics with THS6226ARGTR (reel) and THS6226ARHBT (tray). All RHB-package versions use the same VQFN-32 footprint and PowerPAD™ layout. No PCB redesign is required when substituting among these orderable variants - the THS6226AIRHBR maintains full mechanical and functional compatibility across the family.