GENERAL DESCRIPTION
The AK4342 is a 24-bit stereo DAC with 2Vrms lineout, an integrated headphone amplifier, and an
auxiliary line output. The AK4342 features an analog mixing circuit that enables a simple interface to external analog audio sources. The integrated headphone amplifier features “click-free” power-on/off, a mute control and delivers 62.5mW of power at 16Ω@ 3.3V. The AK4342 is controlled via an I2C or 3-wire interface, and is available in a 32-pin QFN package.

FEATURE
Multi-bit 24-bit ∆Σ DAC
Sampling Rate: 8kHz to 96kHz
8 times Oversampling FIR interpolator
  - Passband: 20kHz
  - Passband Ripple: ±0.02dB
  - Stopband Attenuation: 54dB
Audio I/F Format: MSB First, 2’s Complement
  - I2S, 24bit MSB justified, 24bit/20bit/16bit LSB justified Master Clock:
  - Normal Speed Mode: 256fs/384fs/512fs/768fs
  - Double Speed Mode: 128fs/192fs/256fs/384fs
  - Half Speed Mode: 512fs/768fs
Digital De-emphasis Filter: 32kHz, 44.1kHz and 48kHz
Analog volume control:
  - Headphone: +6dB to – 48dB, Variable Step Size
  - Lineout: 0dB to – 31dB, 1dB step
Digital Linear Attenuator
Digital Soft Mute
Analog Mixing Circuit
µP Interface: 3-wire/I2C (400kHz mode)
Pop Noise Free at Power-ON/OFF and Mute
DAC Performance (Lineout)
  - THD+N: -88dB
  - Dynamic Range: 100dB
  - Output Level: 2Vrms
DAC Performance (Aux-Out)
  - THD+N: -87dB
  - Dynamic Range: 95dB
Headphone Amplifier (Cap-less)
  - Output Power: 62.5mW x 2ch @16Ω, 3.3V
  - THD+N: -60dB @ 25mW
  - Dynamic Range: 95dB
Power Supply:
  - DAC & Output Buffers: 2.7V ∼ 3.6V
  - Digital Interface: 1.6V ∼ 3.6V
Power Supply Current: 30.5mA (Headphone amp off)
Ta: −30 ∼85°C
Package: 32pin QFN