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