726

Audio ICs

Mute detector IC

BA336 / BA338 / BA338L

The BA336, BA338 and BA338L are monolithic ICs designed for mute detection and tape end detection. When a duration

of silence (52dBm or less) exceeds the time constant set with an external CR circuit, a song gap is identified, and after

this a plunger control signal is output during a pulse whose width is determined by another external CR circuit. These

functions are contained in a compact 9-pin package.

The circuit configuration consists of a pre-amp with limiter, a comparator flip-flop, and a driver. Circuitry is also included

which prevents errors when the power is turned on, and measures have been taken to prevent errors due to excessive

input, song gap noise, and other factors.

FApplications

Mute detection

Tape end detection

FFeatures

1) Mute detection time and output pulse width can be

set within a broad range by an external CR circuit.

2) Includes circuit for preventing errors due to song gap

noise.

3) Includes over-current protection circuit.

4) Includes circuit for preventing errors when the power

is turned on.

5) Detection can be stopped using an external input.

FAbsolute maximum ratings (Ta = 25_C)

FRecommended operating conditions (Ta = 25_C)