ALC250 데이터 시트보기 (PDF) - Unspecified

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ALC250

TWO CHANNEL AC’97 2.3 AUDIO CODEC with EQUALIZER

Unspecified 

1. Features

Built- in 7 Bands of Digital Hardware Equalizer

for Optimizing Speaker Response

Single chip with high S/N ratio (>100 dB)

Meets performance requirements for audio on

PC99/2001 systems

Meets Microsoft WHQL/WLP 2.0 audio

requirements

20-bit DAC and 18-bit ADC resolution

Compliant with AC’97 2.3 specifications

-LINE/HP-OUT, MIC-IN and LINE-IN sensing

-14.318MHz- 24.576MHz PLL saves crystal

-12.288MHz BITCLK input can be consumed

-Integrated PCBEEP generator to save buzzer

-Interrupt capability

-Page registers and Analog Plug&Play

Support of S/PDIF out is fully compliant with

AC’97 rev2.3 specifications

Three analog line-level stereo inputs with 5-bit

volume control: LINE_IN, CD, AUX

High quality differential CD input

Two analog line-level mono input: PCBEEP,

PHONE-IN

Supports double sampling rate (96KHz) of DVD

audio playback

Two software selectable MIC inputs

+6/12/20/30dB boost preamplifier for MIC input

Stereo output with 6-bit volume control

Mono output with 5-bit volume control

Headphone output with 50mW/20Ω amplifier

3D Stereo Enhancement

ALC250 Data Sheet

Multiple CODEC extension capability

External Amplifier Power Down (EAPD)

capability

Power management and enhanced power saving

features

Stereo MIC record for AEC/BF application

DC Voltage volume control

Auxiliary power to support Power Off CD

Adjustable VREFOUT control

EQ operation can be controlled by 2 pins of

serial bus

2 Universal Audio Jack (UAJ)® for front panel

Support 32K/44.1K/48K/96KHz of S/PDIF output

Support 32K/44.1K/48KHz of S/PDIF input

Power support: Digital: 3.3V; Analog: 3.3V/5V

Standard 48-Pin LQFP Package

EAX™ 1.0&2.0 compatible

Direct Sound 3D™ compatible

A3D™ compatible

I3DL2 compatible

HRTF 3D Positional Audio

Sensaura™ 3D Enhancement (optional)

10 Bands of Software Equalizer

Voice Cancellation and Key Shifting in Kara

OK mode

AVRack® Media Player

Configuration Panel to improve Experience of

User

2. General Description

The ALC250 is a 20-bit DAC and 18-bit ADC full duplex AC'97 2.3 compatible stereo audio CODEC designed for PC multimedia

systems, including host/soft audio and AMR/CNR based designs. The ALC250 incorporates proprietary converter technology to

achieve a high SNR, greater than 100 dB, sensing logics for device reporting and Universal Audio Jack® to improve user interface.

The ALC250 AC'97 CODEC supports multiple CODEC extensions with independent variable sampling rates and built-in 3D

effects. The ALC250 CODEC provides two pairs of stereo outputs with independent volume controls, a mono output, and multiple

stereo and mono inputs, along with flexible mixing, gain and mute functions to provide a complete integrated audio solution for

PCs. The circuitry of the ALC250 CODEC operates from a +3.3V digital power and +5V analog power supply with EAPD

(External Amplifier Power Down) control for use in notebook and PC applications. The ALC250 integrates a 50mW/20Ω headset

audio amplifier into the CODEC, saving BOM costs. The ALC250 also supports the SPDIF out function, which is compliant to

AC'97 2.3, which can offer easy connection of PCs to consumer electronic products, such as AC3 decoder/speaker and mini disk

devices. The ALC250 CODEC supports host/soft audio from Intel ICHx chipsets as well as audio controller based

VIA/SIS/ALI/AMD/nVIDIA/ ATI chipset. Bundled Windows series drivers (WinXP/ME/2000/98/NT), EAX/ Direct Sound 3D/

I3DL2/ A3D compatible sound effect utilities (supporting Karaoke, 26-kind of environment sound emulation, 10-band of software

equalizer), HRTF 3D positional audio and Sensaura™ 3D (optional) provide an excellent entertainment package and game

experience for PC users. Integrated 14.318M 24.576MHz PLL generate required clock to eliminate the need for external crystal.

Besides, ALC250 also built in seven bands of digital hardware equalizer cascades one lowpass filter, five bandpass filters and one

highpass filter. It is for optimizing frequency response of speaker on mobil PCs.

.

Two Channel AC’97 2.3 Audio Codec

1

Tel: +49(0)234-9351135 · Fax: +49(0)234-9351137 E-MAIL: info@cornelius-consult.de

Rev1.01

http://www.cornelius-consult.de

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