PA3312_15 Datasheet, PDF (1/11 Pages) Unisonic Technologies – DUAL 2.6W AUDIO POWER AMPLIFIER

UNISONIC TECHNOLOGIES CO., LTD
PA3312
DUAL 2.6W AUDIO POWER
AMPLIFIER WITH FOUR
SELECTABLE GAIN SETTINGS
AND INPUT-MUX CONTROL
 DESCRIPTION
The UTC PA3312 is a monolithic integrated circuit that stereo
bridged audio power amplifiers capable of producing 2.6W into 3Ω
with less than 10% THD+N or 1W into 8Ω with less than 0.65%
THD+N. This device minimizes the number of external components
needed, simplifying the design, and freeing up board space for
other features. Both of the depop circuitry and the thermal
shutdown protection circuitry are integrated in UTC PA3312, that
reduce pops and clicks noise during power up or shutdown mode
operation .
Amplifier gain is internally configured and controlled by way of
two terminals (GAIN0 and GAIN1). BTL gain setting of 6 dB, 10 dB,
15.6dB, 21.6dB (inverting) are provided, whereas SE gain is
always configured as 4.1dB for headphone drive. A MUX control
terminal (HP/LINE) allows selection between the two sets of stereo
input signals. To simplify the audio system design, UTC PA3312
combines a stereo bridge-tied loads (BTL) mode for speaker drive
and a stereo single-end (SE) mode for headphone drive into a
single chip, where both modes are easily switched by the SE/BTL
input control pin signal.
 FEATURES
* Low operating current with 10mA
* Compatible with pc 99 desktop line-out into 10KΩ load
* Internal gain control ,which eliminates external gain-setting
resistors
* 2.6w per channel output power into 3Ω at 5V , BTL mode
* Input MUX select terminal
* Pc-beep input
* Improves depop circuitry to eliminate turn-on and turn-off
transients in output
* Fully differential input
CMOS IC
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