Headphone amplifier with TPA6120A

The following article is devoted to a HiFi headphone amplifier project of mine based on BurrBrown’s (Texas Instruments company now) integrated circuit TPA6120A . This IC consists of two high power operational amplifiers in one package. Both amplifiers have separate power supply pins, placed symmetrically on both sides of the package so developing a high density PCB will be easy. TPA6120 has impressive parameters, which make it fit the usage mentioned in its datasheet. The main parameters as follows:

  • 80 mW into 600 Ω From a ±12V Supply at 0.00014% THD + N
  • Current-Feedback Architecture
  • Greater than 120 dB of Dynamic Range
  • SNR of 120 dB
  • Output Voltage Noise of 5 μVrms at Gain = 2 V/V
  • Power Supply Range: ±5 V to ±15 V
  • 1300 V/μs Slew Rate
  • Differential Inputs
  • Independent Power Supplies for Low Crosstalk
  • Short Circuit and Thermal Protection

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