ALC202 Просмотр технического описания (PDF) - Realtek Semiconductor

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ALC202

TWO CHANNEL AC97 AUDIO CODEC

Realtek Semiconductor 

1. Features

Single chip audio CODEC with high S/N ratio (>90

dB)

Compliant with AC’97 2.2 & WHQL

specifications

Support of S/PDIF out is compliant with AC’97

rev2.2 specifications

Meets performance requirements for audio on

PC2001 systems

Meets Microsoft PC99 & WLP 2.0 audio

requirements

18-bit Stereo full-duplex CODEC with

independent and variable sampling rate

18-bit ADC and 20-bit DAC resolution

Four analog line-level stereo inputs with 5-bit

volume control: LINE_IN, CD, VIDEO, AUX

High quality differential CD input

Two analog line-level mono input:

PC_BEEP,PHONE_IN

Supports double sampling rate (96KHz) of DVD

audio playback

Two software selectable MIC inputs

+30dB boost preamplifier for MIC input

Stereo output with 6-bit volume control

Mono output with 5-bit volume control

ALC202/ALC202A

Headphone output with 50mW/8Ω driving

capability (ALC202)

Line output with 50mW/8Ω driving capability

(ALC202A)

Headphone jack-detect function to mute

LINE/MONO/HP output, and to control S/PDIF

output

3D Stereo Enhancement

Multiple CODEC extension capability

External Amplifier Power Down (EAPD)

capability

High performance converter technology

Power management and enhanced power saving

features

2 GPIO pins

No external crystal/clock required

14.318MHz 24.576MHz PLL saves crystal

DC Voltage volume control

Auxiliary power (VAUX ) to support Power Off

CD function

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

Standard 48-Pin LQFP Package

2. General Description

The ALC202/ALC202A is an 18-bit, full duplex AC'97 2.2 compatible stereo audio CODEC designed for PC multimedia systems,

including host/soft audio and AMR/CNR based designs. The ALC202 incorporates proprietary converter technology to achieve a

high SNR, greater than 90 dB. The ALC202 AC'97 CODEC supports multiple CODEC extensions with independent variable

sampling rates and built-in 3D effects. The ALC202 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 digital interface circuitry of the ALC202 CODEC operates from a 5V/3.3V power

supply with EAPD (External Amplifier Power Down) control for use in notebook and PC applications. The ALC202 integrates a

50mW/8Ω headset audio amplifier into the CODEC, saving BOM costs. The ALC202 also supports the SPDIF out function, which

is compliant to AC'97 2.2, which can offer easy connection of PCs to consumer electronic products, such as AC3 decoder/speaker

and mini disk devices. The ALC202 CODEC supports host/soft audio from Intel 810/815/820/845 chipsets as well as audio

controller based VIA/SIS/ALI chipsets. Bundled Windows series drivers (Win95/98/ME/2000/XP/NT) and sound effect utilities

(supporting Karaoke, 26-kind of environment sound emulation, 10-band equalizer) provide an excellent entertainment package for

PC users. Finally, internal PLL circuits generate required timing signals, eliminating the need for external clocking devices.

There are two differences between the ALC202 and the ALC202A. First, the ALC202 includes outputs for headphones with an

op-amp, and in the ALC202A, those outputs are for True Line output and have no op-amp. Second, the Line Out channels on the

ALC202 has no op-amp (1.0Vrms), where the ALC202A includes an op-amp (1.0Vrms).

Line-Out Channel

Pins 39 & 41

ALC202

No op-amp (1.0Vrms)

Headphone output with op-amp

ALC202A

With op-amp (1.0Vrms)

True-Line out without op-amp

2002/07/30

2

Rev.1.28

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