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 |
