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TS472 Product Page
| Targeting
new growth segments for analog integrated circuits,
ST has introduced a new highly integrated, low noise
microphone pre-amplifier for portable applications.
The TS472 is the first in a new line of products focused
on analog and mixed signal ICs for power-sensitive,
battery-operated applications such as flash-based
music players, personal media players, mini-displayers/recorders,
PDAs, smart phones, digital camcorders and digital
voice recorders. |
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The TS472 is a high-performance audio pre-amplifier suitable
for microphone pre-amp applications. Designed with an advanced
BICMOS process, the output gain is adjustable via one external
resistor, making it possible to control gain over a wide range
from 0 to 40dB, reaching 10dB gain with a 27kOhms resistor,
and 0dB gain with a 470Ohms resistor. The TS472 exhibits significantly
lower noise at low gains, wider bandwidth, higher slew rate,
lower distortion, and lower supply current. The part features
internal ESD overload protection on all critical pins. The device
offers a low supply current of 10nA in standby mode, excellent
power supply rejection ratio, around 80dB from the output bias
reference. It offers a low output impedance over the voice bandwidth.
The TS472 provides a low-noise output voltage BIAS reference
designed for biasing electric condenser microphone cartridges.
The BIAS output is regulated typically at 2V. This BIAS output
can source up to 3mA.
Typical internal circuit topology
| Compact Package For Board Space Reduction |
Thanks to its reduced die dimension, cost structure, and good
thermal performance, the TS472 in a 12- bump Flip-Chip package
is ideally tailored for portable electronics.
 Video
and photo cameras with sound input
Sound
acquisition and voice recognition
Video
conference systems
Notebook
computers and PDAs
Low
noise: 10nV/√Hz typ. equivalent input noise at F = 1kHz
Fully
differential input/output
2.2V
to 5.5V single supply operation
Low
power consumption at 20dB: 1.8mA
Fast
start-up time at 0dB: 5ms typ.
Low
distortion: 0.1% typ.
40kHz
bandwidth at -3dB and adjustable
Active
low standby mode function (1nA typ)
Low
noise 2.0V microphone bias output
Flip-Chip
(12 bumps) lead-free package
ESD
protection (2kV)
The TS472 delivers excellent analog audio performance while
providing system designers with a solution that improves battery
life, reduces end product form factors and simplifies the recording
and playback of audio inputs. The TS472 's key distinction against
competing products is that it can operate from a single 2.5V
power supply with low power consumption. The TS472 will finally
enable designers to stop sacrificing audio quality in their
portable products due to size and power constraints.
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