I think some of you have misunderstood what AC'97 really is. It's not a soundcard, it's not a sound chip, it's just an audio codec component specification. An AC'97 compliant audio codec could include the following:
- 16-bit full-duplex stereo audio codec (DAC and ADC)
- AC'97 1.x compliant indicates fixed 48k sampling rate operation (non-extended feature set)
- AC'97 2.1 compliant indicates extended audio feature set (optional variable rate, multichannel , etc.)
- AC'97 2.2 compliant indicates extended audio, enhanced riser audio support and optional S/PDIF
- AC'97 2.3 compliant indicates extended configuration information and optional jack sensing support
- Industry standard 48-pin QFP package and pinout
- Up to four analog line-level stereo inputs and up to two analog line-level mono inputs
- High quality pseudo-differential analog CD input
- MIC input with 20 dB boost, programmable gain, and AEC reference capability
- Dedicated stereo output (LINE_OUT)
- Additional stereo output (AUX_OUT) configurable as line level, optional headphone, or optional 4- or 6-ch output
- Mono output for speakerphone or internal mono speaker output
- Optional 18- or 20-bit DAC and ADC resolution
- Optional output tone and loudness controls
- Optional 3D stereo output enhancement
- Optional 3rd ADC input channel for dedicated voice input
- Optional integrated Sony/Philips Digital Interface (S/PDIF) transmitter for digital output
- Comprehensive power management capability
- Optional codec interrupt generation
- Extended codec revision and configuration information
- Optional jack sensing and reporting of connected devices
More from
AC '97 v2.3 Component Specification.
Now, there are a lot of soundcards and -chips that conform to these specifications, including, but not limited to
- Analog Devices AD1881
- AKM AK4540
- Sigmatel STAC9700, STAC9701, STAC9721, STAC9704, STAC9708, etc.
- Crystal/Cirrus CS4297
- TR28023
- Aureal Vortex (AU8820) and Vortex2 (AU8830)
- ESS Maestro-1 and Maestro-2
- Crystal CS4280
- Trident 4D Wave
- Creative/Ensoniq ES1371/ES1373 (AudioPCI, SB PCI16, PCI64, PCI128)
- Creative SB Live!
- Yamaha YMF724/YMF734/YMF740/YMF744
- Avance Logic ALS300
- Neomagic NM2200
- Intel 810 motherboard chipset
- VIA VT82C686A "south bridge"
- Crystal CS4248/CS4231/CS4231A and Analog Devices AD1848/AD1847/AD1845
So if the quality is below adequate, don't blame the standard. Manufacturers don't always use hifi components in onboard sound. Some have used vacuum tubes, though
