The AK4671 is a stereo CODEC with a built-in Microphone-Amplifier, Receiver-Amplifier and Headphone-Amplifier. The AK4671 features dual PCM I/F in addition to audio I/F that allows easy interfacing in mobile phone designs with Bluetooth I/F. The AK4671 is available in a 57pin BGA, utilizing less board space than competitive offerings.

1. Recording Function (Stereo CODEC)
   ·Four Stereo Inputs and Selector
     (4 Stereo single-ended or 2 Stereo differential)
   ·MIC Amplifier: +30dB to -12dB, 3dB step
   ·Digital ALC (Automatic Level Control):
   　+36dB to -54dB at 0.375dB Steps, Mute
   ·Sound Processor:
   　Wind-noise Reduction Filter, Stereo Separation
      Emphasis, 5-band Programmable Notch Filter
   ·Audio Interface Format:
   　 16bit MSB justified, I²S, DSP Mode
   
2. Playback Function (Stereo CODEC)
   ·Digital Volume: +12dB to -115.0dB, 0.5dB Steps, Mute
   ·Digital ALC (Automatic Level Control):
   +36dB to -54dB, 0.375dB Step, Mute
   ·Sound Processor:
   　 Stereo Separation Emphasis, 5-band EQ
   · Stereo Line Output
   ·Mono BLT Speaker-Driver: 30mW@32Ω (AVDD=3.3V)
   ·Stereo Headphone-Amp: 30mW@16Ω (AVDD=3.3V)
   ·Direct  Analog input  mixing
   ·Audio Interface Format:
   16bit MSB justified, 16bit LSB justified, 16-24bit I²S, DSP Mode
3. Dual PCM I/F for Baseband & Bluetooth Interface
   · Sample Rate Converter :
   Up sample: up to x6, Down sample: down to x1/6
       Sample Rate: 8kHz
   · Digital Volume
   ·Audio/Voice Interface Format:
   16bit Linear, 8bit A-law, 8bit μ-law, Short/Long Frame, I²S, MSB  justified
   
·10bit SAR ADC
·3 Input Selector

4. Clock Mode and Control
·Master Clock:
PLL Mode: 11.2896, 12, 12.288, 13, 13.5, 19.2, 24, 26, 27MHz
External Clock Mode: 256fs, 384fs, 512fs, 768fs or 1024fs
·Output Master Clock Frequencies: 32fs/64fs/128fs/256fs
·Sampling Rate (CODEC):
PLL Slave/Maser Mode : 8kHz to 48kHz
EXT Master/Slave Mode: 8kHz to 48kHz
·Power Management Function
·μP I/F: 4-wire Serial or I²C Bus (400kHz Fast Mode)
·Operation Temperature: -30 to 85°C

·Power Supply:
AVDD, PVDD, SAVDD: 2.2 to 3.6V
DVDD, TVDD2, TVDD3: 1.6 to 3.6V

·Package :
57pin BGA (5mm × 5mm, 0.5mm pitch)
Halogen Free