GENERAL DESCRIPTION

The AK4371 is a 24-bit DAC with an integrated PLL and headphone amplifier. The PLL input frequency is synchronized to typical mobile phone clock frequencies. The AK4371 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 AK4371 is packaged in a 32-pin QFN (4mm×4mm) package, ideal for portable applications.

FEATURE

❐ Multi-bit ΔΣ 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

❐ System Clock

- PLL Mode (MCKI): 27MHz, 26MHz, 19.8MHz, 19.68MHz, 19.2MHz, 15.36MHz, 14.4MHz, 13MHz, 12MHz and 11.2896MHz

- PLL Mode (BICK or LRCK): 64fs, 32fs or fs

- EXT Mode: 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: 6 Inputs (Single-ended or Full-differential)

❐ Stereo Lineout

- S/N: 90dB@3.3V

- Output Volume: +6 to –24dB (or 0 to –30dB), 2dB step

❐ Mono Hands-free Output

- Output Power: 0.8mW @ 600Ω 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: 32pin QFN (4mm x 4mm, 0.4mm pitch)

❐ Register Compatible with AK4368