
ASAHI KASEI 
[AK4342] 
MS0506-E-02 
- 1 - 
2006/07 
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 16
 @ 3.3V. The AK4342 is controlled via an I
2
C 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 
- I
2
S, 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/I
2
C (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 @16
, 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 
AK4342
24-Bit Stereo DAC with HP-AMP & 2V Line-Out