- on Audio/Video/Photography
- Published in issue 7/2004 on page 0
Digital audio equipment usually contains an A/D and a D/A converter. In practice a codec is used for this. This is a chip where both converters are built-in and which often includes standard inputs and outputs for digital audio, such as I2S. Apart from this codec there is often a requirement for a microphone input and headphone output as well.Texas Instruments have made a new codec, the TLV320AIC28, which has an integrated microphone pre-amplifier and a 400 mW headphone amplifier. A few other practical functions have also been added to this chip, such as 2 I/O pins for use in push-button control, microphone detector, etc.