TPA0103PWPRG4 Datasheet, PDF (33/45 Pages) Texas Instruments – 1.75-W 3-CHANNEL STEREO AUDIO POWER AMPLIFIER

TPA0103
1.75-W 3-CHANNEL STEREO AUDIO POWER AMPLIFIER
SLOS167A – JULY 1997 – REVISED MARCH 2000
APPLICATION INFORMATION
Input MUX operation (continued)
RFRHP
RFRLINE
CIRLINE _RIRLINE
21 RLINE IN
CIRHP ^RIRHP
MUX
–
20 RHP IN
+
MID
ROUT 22
COUTR _{Right Channel}
VDD
System ₁₆
Control
HP/LINE
CNTL
MODE A 14
MODE B 11
VDD
Left Channel
Figure 64. TPA0103 Example Input MUX Circuit
Another advantage of using the MUX feature is setting the gain of the headphone channel to –1. This provides
the optimum distortion performance into the headphones where clear sound is more important.
mute and shutdown modes
The TPA0103 employs both a mute and a shutdown mode of operation designed to reduce supply current, I_DD,
to the absolute minimum level during periods of nonuse for battery-power conservation. The SHUTDOWN input
terminal should be held low during normal operation when the amplifier is in use. Pulling SHUTDOWN high
causes the outputs to mute and the amplifier to enter a low-current state, I_DD = 5 µA. SHUTDOWN should never
be left unconnected because amplifier operation would be unpredictable. Mute mode alone reduces I_DD <1 mA.
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