1.5V Stereo Headphone Amplifier

The TA2123AF is the system amplifier IC which is developed for playback stereo headphone equipments. It is built in dual auto−reverse preamplifiers, dual power amplifiers with bass / treble boost function, AMS (automatic music sensor) function, beep function, AGC for power amplifier etc.

Features


 Power amplifier stage

• In case of output coupling type, the supply current decreases. (built−in center amplifier switch)

   • Built−in bass boost function

   • Built−in treble boost function

   • Built−in power amplifier muting function

   • Built−in input terminal for beep signal

   • Built−in input capacitor for reducing buzz noise

   • GV = 24dB (typ.)

   • Built−in AGC circuit (in case of boost mode, this circuit operates.)

• Low supply current

   (VCC = 1.3V, f = 1kHz, RL = 32Ω, Ta = 25°C, typ.)

• Preamplifier stage

   • Auto-reverse compatible

   • Built-in input capacitor for reducing buzz noise

   • Input coupling condensor-less

   • Built-in metal mode drivers

   • Preamplifier muting function

• Built-in ripple filter circuit

• Built-in AMS (automatic music sensor) function (mixer amplifier and level comparator)

• Built-in power switch

• Operating supply voltage range (Ta = 25°C)

   VCC (opr) = 0.95~2.2V