3 V Stereo Headphone Amplifier (3 V USE)

The TA2145AFG is developed for play-back stereo headphone equipments (3 V USE).

It is built in dual preamplifiers, dual OCL power amplifiers, motor governor, DC volume control and preamplifier on/off switch etc.

Features

• Built-in preamplifier

Input coupling condenser-less

Built-in input capacitor for reducing buzz noise

Low noise: Vni = 1.2 µVrms (typ.)

Preamplifier on/off switch.

• Built-in power amplifier

OCL (Output condenser-less)

Voltage gain: GV = 31 dB (typ.)

• Built-in motor governor (Current proportion type)

• Built-in DC volume control function

ATT = 82dB (Ta = 25°C, typ.)

• Built-in bass boost function

• Low supply current (VCC = 3 V, f = 1 kHz, PRE OUT = 100 mVrms, Ta = 25°C, typ.)

• Quiescent supply current

PRE + PW: ICCQ = 8.5 mA

GVN: ICC = 2.5 mA

• 0.1 mW × 2 ch output

ICC1 = 9.8 mA (RL = 32 Ω)

ICC2 = 10.5 mA (RL = 16 Ω)

• 0.5 mW × 2 ch output

ICC3 = 14.0 mA (RL = 32 Ω)

ICC4 = 16.5 mA (RL = 16 Ω)

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

VCC (opr) = 1.8~3.6 V

GVN VCC (opr) = 2.1~3.6 V (Motor voltage = 1.8 V)