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