Date: 25/09/2009

Single chip packs audio-DAC and line-driver functions for consumer electronics gadgets

ST's new TS4657 is a single chip combining audio-DAC (digital-to-analog converter) and line-driver functions to feed the audio Line-Out connection of set-top boxes, DVD players, portable multimedia devices, sound cards, or similar equipment. The Line Out provides a direct connection to drive an external home amplifier, allowing for a better audio experience by maintaining constant signal levels, better digital volume control and a wider volume range

The IC uses an internal power management unit to produce a 2.2Vrms audio-output signal for voltages from 3.0V to 5.5V, eliminating the need for a separate high-voltage power supply to drive the Line-Out output. Similar devices typically require four external capacitors for the charge pumps but ST's high-frequency design integrates this function on-chip, thereby saving board space and bill-of-materials costs.

The TS4657 is in production now, available in the 4 x 4mm QFN20 package and priced at $0.91 in quantities of 1000 units.

For more details visit www.st.com