GENERAL DESCRIPTION
The AK4564 is a 16bit stereo CODEC with a built-in Microphone-Amp, Headphone-Amp and Speaker-Amp. AK4564 has new recording features, a digital equalizer for microphone inputs and a digital ALC (Automatic LevelControl). The playback features also include LINEOUT-Amp, digital volume, Headphone-Amp and Speaker-Amp. The AK4564 suits a portable application with a built-in LCD and etc. The AK4564 is  housedin a space-saving 48pin LQFP package.

FEATURE
1. Resolution: 16bits
2. Recording Function:
   •4-Input Selector (Internal MIC, External MIC, LINE x 2)
   •Pre-Amp
   •Digital EQ/HPF/LPF
   •Digital ALC (Automatic Level Control) circuit
   •FADEIN / FADEOUT
   •Digital HPF for offset cancellation (fc=3.7Hz@fs=48kHz)
   •Enable mixingof BEEP signal
3. Playback Function
   •Digital De-emphasis Filter (tc = 50/15ms, fs = 32kHz, 44.1kHz and 48kHz)
   •LINEOUT-Amp
   •Digital Volume: 0dB ~ -65.25dB, Mute
   •Headphone-Amp-Po: 5.3mW @ 16 W(AVDD = 2.8V)
   •Speaker-Amp with built-in ALC-BTL Output -Po: 80mW @ 8 W
   •Enable mixing of BEEP signal
4. Power Management
5. ADC characteristics (LIN fiADC)
   •S/(N+D): 87dB, DR=S/N: 90dB
6. DAC characteristics (DAC fiLINEOUT-Amp)
   •S/(N+D): 82dB, DR=S/N: 88dB
7. Master Clock: 256fs/384fs
8. Sampling Rate: 8kHz ~50kHz
9. Audio Data Interface Format: MSB-First, 2’s compliment
   •ADC, DAC: 16bit MSB justified, 16bit LSB justified, I2S
10.  Ta = -20 ~85 °C
11.  Power Supply Voltage
   •CODEC, Speaker-Amp: 2.6 ~3.6V
   •MIC/Headphone/LINEOUT-Amp: 2.6 ~5.5V
12.  Power Supply Current
   •All Power On: 30.5mA
13.  Package: 48pin LQFP, 0.5mm Pitch