ASAHI KASEI
[AK4342]
AK4342
24-Bit Stereo DAC with HP-AMP & 2V Line-Out
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 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 @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
MS0506-E-02
-1-
2006/07
AKM [ ASAHI KASEI MICROSYSTEMS ]
