Asynchronous audio codec with on-chip amplifier
8 March 2006
Analogue, Mixed Signal, LSI
STMicroelectronics' STw5095 low power stereo audio/voice codec is designed as a compact and flexible solution for delivering high-quality audio for battery-powered multimedia products and mobile phones. Requiring few external components, it provides high audio quality analog stereo mixing, recording and playback capability, with three line inputs and two direct differential microphone inputs. Audio flows are digitised with 20-bit resolution at between 8 and 96 kHz, the ADC giving 93 dB dynamic range and 0,001% THD - full scale output at 2,7 V. The codec is compatible with a range of audio data serial interfaces including I²S, SPI and PCM. The stereo DAC outputs and multiple analog inputs are selectable and mixable; mixed signals can be connected to the chip's multiple output channels or to the ADC. Control registers for switching and gain control, and for the control of the on-chip bass/treble/volume DSP in the digital audio flow, are accessed through a selectable I²C or SPI compatible interface. Embedded amplifiers can directly drive 40 mW stereo headphones and also drive a separate 500 mW loudspeaker output.
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