alc203-lf Realtek Semiconductor Corporation, alc203-lf Datasheet - Page 5

• Manufacturer Part Number: alc203-lf
• Description: Two-channel Ac?97 2.3 Audio Codec
• Manufacturer: Realtek Semiconductor Corporation

1. General Description
The ALC203 AC'97 codec 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 ALC203 incorporates proprietary converter
technology to achieve a high SNR, greater than 100 dB, sensing logic for device reporting, and Universal Audio Jack® to improve
user experience.
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 ALC203 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. An integrated 14.318M 24.576MHz PLL generate required clock to
eliminate the need for external crystal. Built in PCBEEP generator to save buzzer on board.
The ALC203 integrates a 50mW/20Ω headset audio amplifier into the codec, saving BOM costs. The ALC203 also supports the
SPDIF out function, compliant with AC'97 2.3, which offers easy connection of PCs to consumer electronic products, such as AC3
decoder/speaker and mini disk devices. The ALC203 codec supports host/soft audio from Intel ICHx chipsets as well as audio
controller based VIA/SIS/ALI/AMD/nVIDIA/ATI chipsets.
Bundled Windows series drivers (WinXP/ME/2000/98/NT), EAX/ Direct Sound 3D/ I3DL2/ A3D compatible sound effect utilities
(supporting Karaoke, 26-types of environment sound emulation, 10-band equalizer), HRTF 3D positional audio and Sensaura™ 3D
(optional) provide an excellent entertainment package and game experience for PC users.
2. Features
Two-Channel AC’97 2.3 Audio Codec
The ALC203 supports multiple CODEC extensions with independent variable sampling rates and built-in 3D effects. The ALC203
Single chip with high S/N ratio (>100 dB)
Meets performance requirements for audio on
Meets Microsoft WHQL/WLP 2.0 audio
20-bit DAC and 18-bit ADC resolution
18-bit Stereo full-duplex CODEC with
Compliant with AC’97 2.3 specifications
Support of S/PDIF out is fully compliant with
Three analog line-level stereo inputs with 5-bit
High quality differential CD input
Two analog line-level mono input: PCBEEP,
Supports double sampling rate (96KHz) of DVD
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
PC99/2001 systems
requirements
independent and variable sampling rate
-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
AC’97 rev2.3 specifications
volume control: LINE_IN, CD, AUX
PHONE-IN
audio playback
1
3D Stereo Enhancement
Multiple CODEC extension capability
External Amplifier Power Down (EAPD)
Power management and enhanced power saving
Stereo MIC record for AEC/BF application
DC Voltage volume control
Auxiliary power to support Power Off CD
Adjustable VREFOUT control
2 GPIO pins with smart GPIO volume control
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
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
AVRack
Configuration Panel to improve User
capability
features
KaraOK mode
Experience
®
Media Player
ALC203 DataSheet
Rev1.6