UNISONIC TECHNOLOGIES CO., LTD

UPA2008

Preliminary

CMOS IC

www.unisonic.com.tw

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Copyright © 2015 Unisonic Technologies Co., Ltd

QW-R107-068.a

3W STEREO CLASS-D AUDIO

POWER AMPLIFIER WITH DC

VOLUME CONTROL



DESCRIPTION

The UTC UPA2008 is a third generation 5-V class-D amplifier

which provides precise DC volume control, lower supply current,

lower noise floor, higher efficiency, smaller packaging, and fewer

external components. Designed using a new filter-free class-D

modulation technique, the UTC UPA2008 is capable of directly

driving the speakers, without needing a low-pass output filter

consisting of two inductors and three capacitors per channel.

Eliminating this output filter saves approximately 30% in system

cost and 75% in PCB area.

The UTC UPA2008 improves the chip-level shutdown control,

1µA

total

supply

current

making

the

device

ideal

for

battery-powered applications. It also protects the chip from being

destroyed by over temperature and short current failure. To save

battery power for more essential devices when battery voltage

drops to low levels, undervoltage shutdown is designed in the UTC

UPA2008.

In applications, class-D amplifier for LCD projectors, LCD

monitors, powered speakers, the UTC UPA2008 is also suitable for

battery operated and space constrained systems.



FEATURES

* 3W per channel into 3Ω speakers (THD+N=10%)

-< 0.045% THD at 1.5W, 1kHz, 3Ω load

* Filter free modulation scheme operates without a large and

expensive LC output filter

* DC volume control with 2dB steps from -38dB to 20dB

* Extremely efficient third generation 5V Class-D technology

-Low supply current, 7mA

-Low shutdown control, 1µA

-Low noise floor, -80dBV

-Maximum efficiency into 3Ω, 78%

-Maximum efficiency into 8Ω, 88%

-PSRR, -70dB

* Operating temperature range, -40°C~85°C