GENERAL DESCRIPTION The AK4370 is a 24-bit DAC with headphone amplifier. The AK4370 features an analog mixing circuit that allows easy interfacing in mobile phone and portable communication designs. The integrated headphone amplifier features “pop-noise free” power-on/off, a mute control, and it delivers 40mW of power into 16Ω. The AK4370 is packaged in a 24-pin QFN (4mm×4mm) package, ideal for portable applications. FEATURE □ Multi-bit ΔΣ DAC □ Sampling Rate - 8kHz ∼ 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 □ System Clock - 256fs/384fs/512fs/768fs/1024fs - Input Level: AC Couple Input Available □ Audio I/F Format: MSB First, 2’s Complement - I2S, 24bit MSB justified, 24bit/20bit/16bit LSB justified - Master/Slave Mode □ Digital Mixing: LR, LL, RR, (L+R)/2 □ Bass Boost Function □ Digital ATT □ Analog Mixing Circuit: 4 Inputs (Single-ended or Full-differential) □ Stereo Lineout - S/N: 90dB@3.3V - Output Volume: +6 to –24dB (or 0 to –30dB), 2dB step □ Headphone Amplifier - Output Power: 40mW x 2ch @16Ω, 3.3V - S/N: 92dB@3.3V - Pop Noise Free at Power-ON/OFF and Mute - Output Volume: 0 ~ –63dB & +12/+6/0 dB Gain 1.5dB step (0 ~ –30dB), 3dB step (–30 ~ –63dB) □ μP Interface: 3-wire/I2C □ Power Supply: 1.6V ∼ 3.6V □ Power Supply Current: 3.8mA @1.8V (6.8mW, DAC+HP, No output) □ Ta: −30 ∼ 85°C □ Small Package: 24pin QFN (4mm x 4mm, 0.5mm pitch) □ Register Compatible with AK4368
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