AK4951EG Datasheet, PDF (1/30 Pages) Asahi Kasei Microsystems – 24bit Stereo CODEC with MIC/HP/SPK-AMP

[AK4951]
= Preliminary =
AK4951
24bit Stereo CODEC with MIC/HP/SPK-AMP
1. General Description
The AK4951 is a low power 24-bit stereo CODEC with a microphone, headphone and speaker amplifiers.
The AK4951 supports sampling frequency from 8kHz to 48kHz. It is suitable for a wide range of application
from speech signal processing for narrowband, wideband and super wideband to sound signal processing for
audio band.
The input circuits include a microphone amplifier, an automatic wind noise reduction filter of the proprietary
algorithms and a high performance digital ALC (automatic level control) circuit, therefore the AK4951 can
record with high-quality sound regardless of whether indoors or outdoors. In addition, the output circuits
include a cap-less headphone amplifier with a negative voltage generated by charge pump circuit and a speaker
amplifier with 1W output power. It is suitable for various products as well as portable applications with
recording/playback function.
The AK4951 are available in a small 32-pin QFN (4mm x 4mm, 0.4mm pitch: AK4951EN) and a 32-pin BGA
(3.5mm x 3.5mm, 0.5mm pitch: AK4951EG) packages saving mounting area on the board.
Application:
 IP Camera
 Digital Camera
 IC Recorder
 Tablet
 Wireless Headphone
 Headset
2. Features
1. Recording Functions
 Analog Input
(AK4951EN) 3 Stereo Single-ended inputs with Selectors
(AK4951EG) 2 Stereo and 1 Monaural Single-ended inputs with Selectors
 Microphone Amplifier: +30dB ~ 0dB, 3dB Step
 Microphone Power Supply: 2.0V or 2.4V, Noise Level= 108dBV
 Digital ALC (Automatic Level Control)
- Setting Range: +36dB  52.5dB, 0.375dB Step & Mute
 ADC Performance: S/(N+D): 83dB, DR, S/N: 88dB (MIC-Amp=+18dB)
S/(N+D): 85dB, DR, S/N: 96dB (MIC-Amp=0dB)
 Microphone Sensitivity Correction
 Automatic Wind Noise Reduction Filter
 5-Band Notch Filter: Include Dynamic Gain Control
 Stereo Separation Emphasis Circuit
 Digital Microphone Interface
014004561-E-00-PB
-1-
2014/08