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ST's audio codec suits cell phones, PMPs

Posted: 16 Feb 2006     Print Version  Bookmark and Share

Keywords:STw5095  audio codec  amplifier  DAC  digital-to-analogue converter 

STMicroelectronics (ST) has announced the STw5095 low power stereo audio/voice codec, which features integrated amplifiers for headphones and hands-free equipment. The product is designed as a compact solution for delivering audio in the low voltage conditions of battery-powered multimedia products and cell phones.

The STw5095 provides high audio quality analogue stereo mixing, recording and playback capability, with three line inputs and two direct differential microphone inputs. Audio flows are digitized with 20bit resolution at between 8kHz and 96kHz, the ADC giving 93dB dynamic range and 0.001per cent total harmonic distortion (THD), with full scale output at 2.7V. The output stereo DAC operates independently over the same data rate, with a 95dB dynamic range and 0.02 per cent THD.

The product also comes with an extended master clock range of between 4MHz and 32MHz, asynchronous digital input and output data rates, and compatibility with a range of audio data serial interfaces including I2S, SPI and PCM. Voice control and recording is supported by an 8/16kHz voice codec with embedded channel filters.

The stereo DAC outputs and multiple analogue 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 or volume DSP in the digital audio flow is accessed through a selectable I2C or SPI compatible interface.

Embedded amplifiers can directly drive stereo headphones (2 x 40mW into 16 ΩsΩ, with a 40dB gain range) using a phantom ground configuration to eliminate coupling capacitors, and also drive a separate 500mW hands-free/loudspeaker output. An independent stereo differential/single line out with gain control is provided.

The STw5095 can use the same 2.4V to 2.7V supply for all of its functions, or it can use different power supplies for its digital and analogue circuits, and for the loudspeaker driver, to achieve optimum performance. Typical power consumption for playback is 23mW, and 1μW in standby. The new codec is available in a 5-by-5-by-1.2mm TFBGA64 package with 0.5mm ball pitch.

Engineering samples and evaluation boards are already available. Pricing for the STw5095 is Rs.141.50 ($3.20) for 1,000 units.

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