Automotive 75-W, 2-MHz, 2-channel, 4.5-V to 26.4-V digital input Class-D audio amplifier


Product details


Audio input type Digital Input Architecture Class-D Speaker channels (Max) Stereo Power stage supply (Max) (V) 26.4 Power stage supply (Min) (V) 4.5 Load (Min) (ohms) 2 Output power (W) 75 THD + N @ 1 kHz (%) 0.02 Iq (Typ) (mA) 84 Control interface I2C Closed/open loop Closed Analog supply (Min) (V) 4.5 Analog supply (Max) (V) 26.4 Sampling rate (Max) (kHz) 96 PSRR (dB) 75 Operating temperature range (C) -40 to 125 open-in-new Find other Speaker amps

Package | Pins | Size

HSSOP (DKQ) 56 191 mm² 18.42 x 10.35 open-in-new Find other Speaker amps


  • AEC-Q100 Qualified for automotive applications
    • Temperature grade 1: –40°C to +125°C TA
  • Advanced load diagnostics
    • DC Diagnostics run without input clocks
    • AC Diagnostic for tweeter detection with impedance and phase response
  • Easily meets CISPR25-L5 EMC specifications
  • Audio inputs
    • 2 Channel I2S or 4/8-channel TDM input
    • Input sample rates: 44.1 kHz, 48 kHz, 96 kHz
    • Input formats: 16-bit to 32-bit I2S, and TDM
  • Audio Outputs
    • Two-channel bridge-tied load (BTL)
    • Single-channel parallel BTL (PBTL)
    • Up to 2.1 MHz output switching frequency
    • 45 W, 10% THD+N Into 2 Ω at 14.4 V BTL
    • 75 W, 10% THD+N Into 4 Ω at 25 V BTL
    • 150W, 10% THD+N Into 2 Ω at 25V PBTL
  • Audio performance into 4 Ω at 14.4 V BTL
    • THD+N < 0.02% at 1 W
    • 42 µVRMS output noise
    • –90 dB crosstalk
  • Load diagnostics
    • Output open and shorted load
    • Output-to-battery or ground shorts
    • Line output detection up to 6 kΩ
    • Host-independent operation
  • Protection
    • Output current limiting and short protection
    • 40 V Load dump
    • Open ground and power tolerant
    • DC offset
    • Over-temperature
    • Undervoltage and overvoltage
  • General Operation
    • 4.5 V to 18 V supply voltage
    • I2C Control with 4 address options
    • Latched & Non-Latched Clip Detect
    • Enhanced EMI Management

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The TAS6422E-Q1 device is a two-channel digital-input Class-D audio amplifier that implements a 2.1 MHz PWM switching frequency enabling a cost-optimized solution in a very small PCB size, full operation down to 4.5 V for start/stop events, and exceptional sound quality with up to 40 kHz audio bandwidth.

The devices adds EMI management features including spread-spectrum to assist in system level EMI challenges.

The output switching frequency can be set either above the AM band, which eliminates AM-band interferences and reduces output filtering and cost, or below the AM band to optimize efficiency.

The device has a built-in load diagnostic function for detecting and diagnosing misconnected outputs as well as detection of AC-coupled tweeters to help to reduce test time during the manufacturing process.

The TAS6422E-Q1 Class-D audio amplifier is designed for use in automotive head units and external amplifier modules. For pin compatible one, two and four-channel devices see the the Device Options table.

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Exact equivalent in functionality and parametrics to the compared device:
TAS6422-Q1 ACTIVE Automotive, 75-W, 2-MHz, 2-ch 4.5- to 26.4-V digital input Class-D audio amplifier w/ load dump Pin-to-pin standard 2-channel amplifier

Technical documentation

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Type Title Date
* Data sheet TAS6422E-Q1 45-W, 2-MHz Digital Input 2-Channel Automotive Class-D Audio Amplifi datasheet (Rev. A) Nov. 16, 2020
User guide TAS6422E-Q1 EVM User's Guide (Rev. A) Feb. 01, 2021

Design & development

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Hardware development

document-generic User guide
The TAS6422EQ1EVM evaluation module (EVM) showcases a 2-Mhz, 4-channel digital input Class-D audio solution for automotive infotainment. The TAS6422E’s 2.1-Mhz switching frequency allows users to significantly reduce inductor size and optimize total system cost. TAS6422E delivers 25 W (...)
  • 2.1-Mhz switching Frequency.
  • 2-channel 25-W/channel at 10% THD+N into 4-Ω with a 14.4-V supply
  • I2C diagnostics and protection
  • CISPR25, Class 5 radiated/conducted emission compliant
  • Optical SPDIF, USB and PSIA (external I2S) input options
  • Integrated spread spectrum technology

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  • Preinstalled library with a suite of digital models to enable worst-case timing analysis
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