The BA3714F is a signal sensor consisting of a sensor circuit which detects the presence of an input signal, a logic circuit which controls an output drive circuit based on the input signal, and an output drive circuit. The signal sensor circuit employs the dual-wave rectified current method for excellent response.
The outputs TE of Pin 3 and TON of Pin 5 can be respectively set by choosing appropriate values for the capacitor between Pin 7 and VCC and the capacitor between Pin 1 and ground.
Drive outputs include two systems OUT1 and OUT which are controlled by the logic block. These systems can be combined to enable a wide range of designs.

Features
1) Operation possible at ultra-low voltages. (VCC = 0.8 to 4.5V)
2) Minimal attached components.
3) Uses dual rectified current method for excellent signal response.
4) Very low current dissipation. (IQ = 0.9mA)
5) When used for a tape end sensor, can also be used with mechanical auto-off.
6) SOP 8-pin package allows space conservation on the board.

Applications
    Tape end sensors for 1.5 to 3V headphone stereos
    Mute and song selection sensors