Overview:
AK4571 is built-in and 1ch A / D converter, a 2ch D / A converter 1 Chip 16bit CODEC. AK4571 has a USB I / F, via the USB bus To make the transfer of data. In one of the crystal, seven types of sampling It is possible to set the frequency, ADC, DAC independently operable is. PLL and for this, the transceiver, SIE (Serial Interface Engine), audio control circuit, FIFO, etc. has a built-in all.
Analog input, as well as with the first stage 20dB fixed amplifier, from + 24dB It has a variable that can be gain amplifier for each 1dB to -31dB. further, Analog input, mixing and D / A output, be analog output Is possible.

FEATUREs :
■ USB audio controller built-in
   12 Mbps bit rate
   USB Serial Interface Engine（SIE）
   Audio Class Processing Block
   4 Endpoints
   USB transceiver
■ 16 bit codec
   - A/D Converter
      1 channel for Microphone
      Pre-Amp (Fixed Gain: 20dB)
      Mute/Volume Control
      Programmable Gain Control +24dB to –31dB ( 1dB step )
   - D/A Converter
      2 channel
   - Mixer
      Mute/Attenuation Control +0dB to –47dB ( 1dB step )
      Analog Bass Boost
■ HID Support
   - Play for volume mute control can be at hand
   - Record for Mute & status
■ Power Management
   - External headphone amplifier control
■ EEPROM Interface (Micrpwore Type)
   - Descriptor that can be read from an external EEPROM
   - 1K / 2K / 4K bit EEPROM corresponding
■ On-chip PLL
   7 Frequency response: 8kHz, 11.025kHz, 16kHz, 22.05kHz, 32kHz, 44.1kHz, 48kHz
■ Single Power Supply, Low Power
   + 3.3Volts ± 0.3V
■ Package
   48pin LQFP