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AK4561

16bit CODEC with built-in ALC and MIC/HP-Amp

Asahi Kasei Microdevices 

ASAHI KASEI

AKM CONFIDENTIAL

[AK4561]

- Preliminary -

AK4561

16bit CODEC with built-in ALC and MIC/HP-Amp

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=50/15µs, fs = 32kHz, 44.1kHz and 48kHz)

• LINEOUT Buffer: +2dBV

• Analog Volume

- 0dB ∼ -50dB, Mute

• Headphone-Amp

- Output Level: -5.5dBV@VA=2.8V, RL=55Ω

• 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

Rev. 0.9

2000/09

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