738
Audio ICs
Mute detector IC for 3V sets
BA3708F
The BA3708F is a mute detector IC for 3V tape players. When the signal is higher than the input decision level VIN and
longer than the song detect time, a pulse of width TW is output after the pulse delay time TD which begins when the input
signal ends. The output is an open collector which enables direct drive of the plunger. A mute function is included which
makes it possible to stop detection.
Applications
3V tape players
Features
1) Low supply voltage (can be operated at 1.8V; recom-
mended operating voltage is 2.0 to 5.0V).
2) Uses the song detection method to minimize incor-
rect detection caused by noise between songs.
3) The pulse delay time TD, pulse width TW, and song de-
tect time TC can be set using external CR time
constants.
4) Includes a mute circuit which makes it possible to
stop song selection.
5) Built-in output transistor enables direct drive of the
plunger. (IO Max. = 100mA)
Absolute maximum ratings (Ta = 25 C)
Recommended operating conditions