Digital-in Class-D audio amplifier demonstration kit

TFA9879D Archived
  • This page contains information on a product that is no longer manufactured (discontinued). Specifications and information herein are available for historical reference only.

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The demonstration PCB is designed to operate from a single supply with a wide supply voltage range of 2.5V - 5.5V delivering an output power up to 1.6WRMS in 8W Ω BTL or 2.7WRMS 4W Ω BTL. The application PCB area for the TFA9879 is very small because only three external components are required. The demo board is EMC compliant and contains 15kV ESD protections at the speaker output.

Product Details

Features

General

  • Wide supply voltage range 2.5 V - 5.5 V
  • Two digital inputs (I2S and PCM/IOM2 formats, 1.8 V and 3.3 V tolerant) which are less sensitive to external RF fields
  • Internal Phase-Locked Loop (PLL) requiring no system clock
  • High efficiency of 92% and low power consumption
  • Closed loop amplifier resulting in excellent audio performance:
    • PSRR = -76 dB
    • S/N = -95 dB (A-weighted)
    • THD+N = 0.015% at 100 mWRMS
  • High-power capability:
    • 2.7 WRMS in 4 W Ω BTL at 5 V
    • 1.6 WRMS in 8 W Ω BTL at 5 V
  • Protections including diagnostic via I2C:
    • I2S and PCM/IOM2 input protections
      • Under Frequency Protection (UFP)
      • Over Frequency Protection (OFP)
      • Invalid Bit clock Protection (IBP)
    • OverCurrent Protection (OCP)
    • OverTemperature Protection (OTP)
  • HVQFN24 package

DSP

  • Volume control (-70 dB to +24 dB)
  • 5-band parametric equalizer
  • Dynamic Range Compression
  • Bass-treble control (-18 dB to +18 dB)
  • High-pass filter
  • Power limiter (0 dB to -124 dB)
  • Zero crossing detect

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