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TS4956 Product Page
| Mobile handset
designs are evolving from custom multichip designs
to standard highly integrated solutions. To meet the
challenges of this more standardized market for mixed-analog
ICs, ST has introduced a new highly-integrated stereo
audio amplifier system for portable applications.
The TS4956 is part of a new line of products focused
on handset architectures using single-chip audio phone
amplifying solutions for the latest generation of
portable applications such as smart phones, multimedia
devices, PDAs and personal navigators. |
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The TS4956 is a complete audio system device with three dedicated
outputs, one stereo headphone, one loudspeaker drive and one
mono line output. It can drive up to 38mW per channel continuous
average power into 16ohms headphone loads, or 450mW into 8ohms
loudspeaker loads, when operating on a 3.3V power supply. The
TS4956 features an excellent power supply rejection ratio, as
wellas an ultra-low standby current of 0.5mA, with just 10nA
shut down current. It can operate on power supplies from 2.7V
to 5.5V..
Typical internal circuit topology
An advanced pop and click-less reduction circuitry
as well as an internal ESD overload protection on all critical
pins is also integrated inside the single chip. Designed with
an advanced BICMOS process, this device uses an I²C bus
interface to control functions such as the I/O switch matrix,
digital volume control, start up and standby mode phases.
The TS956 has 32 digital volume control steps in a gain range
from -34dB to +12dB and 8 different output mode selections.
Using the I²C interface, one can set the device to output
mode 7, putting the TS4956 in 2x1W Stereo Loudspeaker configuration.
A quality stereo headphone mode is also provided, enabling features
such as MP3 player functionality.
The TS4956 delivers excellent analog audio performance while
providing system designers with a solution that improves battery
life, and reduces end product form factors. Thanks to its reduced
die dimension, cost structure, and good thermal performance,
the TS4956 packaged in a lead-free 2.5x2.4mm 18-bump Flip-Chip,
is ideally tailored for portable applications.
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