C-Media used to be very popular, especially on low-end motherboards, and they manufactured both codecs and complete audio controllers. Audio controllers usually need an external codec to do the analog-to-digital and digital-to-analog conversions, but C-Media’s low-end audio controllers have a codec embedded inside the chip, which is why we will include them in the table below. Because of that, we included a column called “type” to let you know if the chip is just a codec requiring an external controller (e.g., connected to the south bridge chip) or if it is a complete controller with an embedded codec (usually connected to the PCI bus). Chips from C-Media use names starting with the letters “CMI,” as you can see on the example shown in Figure 3.
|Model||Type||Channels||Input Resolution||Output Resolution||Input Max. Sampling Rate||Output Max. Sampling Rate||Input SNR||Output SNR|
|CMI8738-LX, CMI8738MX||Controller||5.1||16-bit||16-bit||48 kHz||48 kHz||80 dB||80 dB|
|CMI8738-SX||Controller||4||16-bit||16-bit||48 kHz||48 kHz||80 dB||80 dB|
|CMI8768||Controller||7.1||16-bit||24-bit||48 kHz||96 kHz||86 dB||101 dB|
|CMI9738||Codec||4||20-bit||20-bit||48 kHz||48 kHz||72 dB||82 dB|
|CMI9739||Codec||5.1||20-bit||20-bit||48 kHz||48 kHz||NA||NA|
|CMI9761||Codec||5.1||20-bit||24-bit||48 kHz||96 kHz||90 dB||92 dB|