Audio ICs 1.5V signal sensor BA3714F 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. Applications Tape end sensors for 1.5 to 3V headphone stereos Mute and song selection sensors 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. Absolute maximum ratings (Ta = 25C) Recommended operating conditions (Ta = 25C) 746 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. Audio ICs BA3714F Block diagram Electrical characteristics (unless otherwise noted, Ta = 25C and VCC = 1.25V) 747 Audio ICs BA3714F Measurement circuit Timing chart 748 Application example Audio ICs BA3714F External dimensions (Units: mm) 749