GENERAL DESCRIPTION
The AK4368 is 24-bit DAC with an integrated PLL and headphone amplifier. The PLL input frequency is synchronized to typical mobile phone clock frequencies. The AK4368 features an analog mixing circuit that allows easy interfacing in mobile phone and portable communication designs. The AK4368 includes a 3-D stereo enhancement circuit that operates with both the headphone amplifier and the stereo lineout. The integrated headphone amplifier features “pop-free” power-on/off, a mute control, and it delivers 50mW of power into 16Ω. The AK4368 is packaged in a 41-pin BGA package, deal for portable applications.

FEATURE
■ Multi-bit ∆Σ DAC
■ Sampling Rate
   - 8kHz, 11.025kHz, 12kHz, 16kHz, 22.05kHz, 24kHz, 32kHz, 44.1kHz and 48kHz
■ On chip perfect filtering 8 times FIR interpolator
   - Passband: 20kHz
   - Passband Ripple: ±0.02dB
   - Stopband Attenuation: 54dB
■ Digital De-emphasis Filter: 32kHz, 44.1kHz and 48kHz
■ PLL:
   - Input Frequency: 27MHz, 26MHz, 19.8MHz, 19.68MHz, 19.2MHz, 15.36MHz, 14.4MHz, 13MHz, 12MHz and 11.2896MHz
   - Input Level: AC Couple Input Available
■ Audio I/F Format: MSB First, 2’s Compliment
   - I2S, 24bit MSB justified, 24bit/20bit/16bit LSB justified
   - Master/Slave Mode
■ Mixing: LR, LL, RR, (L+R)/2
■ Digital ALC
■ Digital ATT
■ Analog Mixing Circuit
■ 3D Stereo Enhancement
■ Stereo Lineout
■ µP Interface: 3-wire/I2C
■ Bass Boost Function
■ Headphone Amplifier
   - Output Power: 50mW x 2ch @16Ω, 3.3V
   - S/N: 92dB@3.3V
   - Pop Noise Free at Power-ON/OFF and Mute
■ Power Supply: 1.6V ∼ 3.6V
■ Power Supply Current: 4.0mA @2.4V (HP-AMP no output)
■ Ta: −30 ∼ 85°C
■ Small Package: 41pin BGA (4mm x 4mm, 0.5mm pitch)