BA338L PDF 데이터시트 : 부품 기능 및 핀배열

부품번호 BA338L
기능 Mute detector IC
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BA338L 데이터시트, 핀배열, 회로
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.
Mute detection
Tape end detection
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
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)

BA338L pdf, 반도체, 판매, 대치품
Audio ICs
BA336 / BA338 / BA338L
FCircuit operation
The BA336 / BA338 / BA338L operates according to
the timing shown in Fig. 2. When the input signal is below
the input decision level, the electrical potential of Pin 2
begins to rise according to the time constant set by CD
and RD. When it reaches 1 / 2 of VCC, the comparator
which sets the mute detection time inverts. At this point
the potential of Pin 1 begins to rise according to the time
constant set by CW and RW, and when it reaches 1 / 2 of
VCC, the pulse width comparator inverts. During the inter-
val from the inverting of the mute detection time
comparator to the inverting of the pulse width compara-
tor, the output is high. When the power is turned on or
muting is turned off, a reset pulse is generated for a cer-
tain period of time (determined by the Pin 6 capacitor),
the internal flip-flop resets, and an output pulse is not
generated. When an input signal comes in after this, the
flip-flop resets, mute detection goes on standby, and an
output pulse is obtained with each song gap.If the mute
time is TM, the song detection time TD and the output
pulse width TW must be selected so that TD ) TW < TM.
Furthermore, TD must be made longer than any periods
of silence in songs.


BA338L 전자부품, 판매, 대치품
Audio ICs
FElectrical characteristic curves
BA336 / BA338 / BA338L
FExternal dimensions (Units: mm)


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Mute detector IC


Mute detector IC

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