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