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, R
L
=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
-1-
2000/09
AKM [ ASAHI KASEI MICROSYSTEMS ]
