The ALC is an bit, full duplex AC’97 compatible stereo audio CODEC designed for PC multimedia systems, including host/soft audio and AMR/CNR. Description, AC’97 Audio Codec. Company, Realtek Semiconductor Corporation. Datasheet, Download ALC datasheet. Quote. Find where to buy. Quote. Avance Logic, Inc. ALC AVANCE LOGIC, INC. SINGLE CHIP SIX CHANNEL AC’97 AUDIO CODEC ALC 1. Features.

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Set GPIO1 as input pin. Always read as 0. Note that the 3D bit in the general purpose datasehet bit 13 must be set to 1 to enable this function. And there is no gain for MX Stereo output with 5-bit volume control.

GPIO0 is driven high by external device input. The 3D stereo enhancement function provides for a deeper and wider sound experience with a potential 6-speaker arrangement.

GPIO1 is driven low by external device input. See table under Section 6. Locked R Ca [1: Combined rise or fall plus flight times are provided for worst case scenario modeling purpose. Sample Frequency in channel status Reading this register returns the ID code of the specific part.


The GPIOx is internally pulled high by a weak resistor. The 6th bit implementation is optional.

ALC datasheet, Pinout ,application circuits SIX-CHANNEL AC’97 AUDIO CODEC

Locked by hardware 0: Each step in bits If validity control is set MX3A. This register used to control the master volume of surround output. When this register is written, the bit values that come in on AC-Link will have no effect on read only bits and bit Example of differential CD input 9. For this reason, when 6th bit is written by datashet, it is equivalent to writing low 5-bit with 1.

Cold, Warm and Register reset which listed below: S-OUT is the real surround output. Bit 7 enables loopback of the AD output to the DA input without involving the AC-Link, allowing for full system performance measurements. Vref is up to normal level 0: Drive GPIO0 as high. This register used dataeheet control the master volume of LFE and center output.

Register Write register indexed 00h Reset all registers to their default values. Power down Mixer Vref off PR2 0: The written data is ignored. A transaction which polarity depends on MX Mono output is the same data sent on all output channels.

Set GPIO0 as output pin. Bit Type Function Not yet DAC Status 1: Not yet ADC Status 1: Each step on the left and right channels correspond to 1.


Write 1 datasheef clear this status bit. Read as 0 Depth control DP[ Writing 1xxxxx will be interpreted as x and read as x Set GPIO0 as input pin. External amplifier power down capability.

Because software modem applications may not have a speaker, the CODEC can offer a speaker-out service. Each step in bit 6 corresponds to a magnification of 20dB increase in volume. Power down Mixer Vref still on PR1 0: Bit 9 allows selection of mono output.

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Bit 13 enables or disables 3D control. Analog Performance Characteristics Standard test condition: Intel Pentium 4 Proces Bit Type Function 15 Reserved Bit 8 controls the mic selector.

Drive GPIO0 as low. Below is an example of differential CD input. The first three codes have been assigned by Microsoft for Plug and Play definitions. EAPD output low enable external amplifier 1: