AS3560 Class-G Stereo Headphone Amplifiers

Description

The AS3560 and AS3561 are true ground headphone amplifiers using Class G and Class H topologies respectively. These products combine highest quality audio associated with traditional Class AB topology together with very low power consumption by modulating the power to the headphone amplifier according to needs. The Class G topology switches between 3 power rails, while the Class H adapts the power rail to whatever power is needed to drive the headphone volume. Both devices use differential line inputs to minimize the effects of ground noise and EMI susceptibility and output volume can be locally adjusted trough I2C.

Key Features

• G-Class amplifier with integrated DCDC buck converter
  • 2x30mW, 0.02% THD @16Ω
  • >100dB SNR @1Vrms
• Charge pump for true ground output without coupling capacitors
• Direct battery connection with wide supply range: 2.3V to 5.5V
• Low power consumption optimized for battery operation
  • 1 mA quiescent current with both channels enabled
  • <5 μA shutdown current
• Fully Differential Inputs reduce system noise
  • Also configurable as Single-Ended Inputs
• SGND pin for ground sensing and ground feedback minimizes sensitivity to interference
• I2C control interface
  • volume control with 32 gain steps, -59 to +4dB, <-80dB mute
  • Channel independent enable control
  • Current and Temperature Supervisor
• Package: 0.4 mm Pitch WL-CSP (1.615x1.615mm)

Applications

• Mobile Phones
• Portable Navigation Devices
• Media Devices

Block diagram for AS3560 Class-G Stereo Headphone Amplifiers