GENERAL DESCRIPTION
AK4561 is a 16bit stereo CODEC with a built-in Microphone-Amp, Headphone-Amp. Input circuits include Microphone/LINE inputs selector, power supply for microphone, Pre-Amp, HPF-Amp, EQ-Amp and ALC (Automatic Level Control) circuit, and output circuits include LINEOUT buffer, Analog Volume and Headphone-Amp. As Multi-Power-Supply-System can be set a suitable power supply voltage in each block, the AK4561 is compatible with high performance and low power dissipation. The package is a 64pin TQFP, therefore, a new system can be a smaller board area than a current system is composed of 2 or 3 chips.

FEATURE
1. Resolution: 16bits
2. Recording Function
    • 3-Input Selector (Internal MIC, External MIC and LINE)
    • MIC-Amp
        - Pre-Amp, EQ-Amp, HPF-Amp for wind-noise
    • Digital ALC (Automatic Level Control) circuit
    • FADEIN/FADEOUT
    • Digital Delay circuit
    • Digital HPF for offset cancellation (fc=3.7Hz@fs=48kHz)
3. Playback Function
    • Digital De-emphasis Filter (tc=50/15ms, fs = 32kHz, 44.1kHz and 48kHz)
    • LINEOUT Buffer: +2dBV
    • Analog Volume
        - 0dB ~ -50dB, Mute
    • Headphone-Amp
        - Output Level: -5.5dBV@VA=2.8V, RL=55W
    • Monaural Output Buffer
    • BEEP Signal Input
4. Analog Through Mode
5. Power Management
6. ADC Characteristics (LINEIN ® ALC ® ADC)
    • S/(N+D): 78dB, DR=S/N: 86dB
7. DAC Characteristics (DAC ® LINEOUT)
    • S/(N+D): 76dB, DR=S/N: 88dB
8. Master Clock: 256fs/384fs
9. Sampling Rate: 8kHz ~50kHz
10. Audio Data Interface Format: MSB-First, 2’s compliment (AK4550 Compatible)
    • ADC: 16bit MSB justified, DAC: 16bit LSB justified
11. Ta = -20 ~ 85°C
12. Power Supply
    • CODEC, Analog Volume, Headphone-Amp: 2.6 ~ 3.3V (typ. 2.8V)
    • LINEOUT: 3.8 ~ 5.5V (typ. 4.5V)
    • MIC-Amp: 2.6 ~ 5.0V (typ. 2.8V)
    • Digital I/F: 1.8 ~ 3.3V (typ. 2.8V)
13. Power Supply Current
    • All Circuit Power On: 37mA
14. Package: 64pin TQFP, 0.4mm Pitch