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 em-
ploys the dual-wave rectified current method for excellent response.
The outputs T
E
of Pin 3 and T
ON
of Pin 5 can be respectively set by choosing appropriate values for the capacitor between
Pin 7 and V
CC
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 com-
bined to enable a wide range of designs.
FApplications
Tape end sensors for 1.5 to 3V headphone stereos
Mute and song selection sensors
FFeatures
1) Operation possible at ultra-low voltages. (V
CC
= 0.8
to 4.5V)
2) Minimal attached components.
3) Uses dual rectified current method for excellent sig-
nal response.
FAbsolute
maximum ratings (Ta = 25_C)
4) Very low current dissipation. (I
Q
= 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.
FRecommended
operating conditions (Ta = 25_C)
746
1
2
3
4
