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PDF BA336 Data sheet ( Hoja de datos )

Número de pieza BA336
Descripción Mute detector IC
Fabricantes ROHM Semiconductor 
Logotipo ROHM Semiconductor Logotipo



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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)
726

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BA336 pdf
Audio ICs
FApplication example
BA336 / BA338 / BA338L
FAttached components (see Fig. 3)
(1) Input coupling capacitor CIN and resistor RIN (Pin 3)
This capacitor is for coupling a pre-amp to the
BA336 / BA338 / BA338L.
If the DC level of the pre-amp output is GND, the coupling
capacitor can be omitted. If a coupling capacitor is con-
nected, Pin 3 must be connected to GND through a resis-
tor. If the resistor between Pin 3 and GND is too large, an
offset will occur due to a voltage drop caused by the input
current, and the input decision level will change. We rec-
ommend 10kor less. The input decision level of the
BA336 / BA338 / BA338L is highly sensitive at*52dBm.
In the application example, the pre-stage output is di-
vided to adjust the sensitivity and increase the input im-
pedance. Furthermore, the low cutoff frequency fc is de-
termined by the input circuit time constant or the Pin 4
time constant, whichever is smaller. As it is better to de-
termine fc by the Pin 4 CF when the power is turned on,
we recommend making the time constant of the input cir-
cuit larger than that of Pin 4.
(2) DC cutoff capacitor in feedback circuit CF (Pin 4)
This determines the low cutoff frequency fC. The relation
of CF and fC is as follows :
CF =
1
0.4πfC (kHz)
(µF)
If CF = 1µF, fC 800Hz.
The larger CF is, the more time it will take for the circuit
730
to stabilize when the power is turned on.
(3) Muting capacitor for power up CM (Pin 6)
After the power is turned on, this capacitor stops song
selection until the circuit stabilizes. If the value of CF is
large, a large CM will also be necessary. CM must be
greater than CF. Also, if it takes longer for the external cir-
cuit to stabilize, select CM based on the external circuit.
The relation between CM and the muting time is as fol-
lows :
TM 30CM (µF)
(4) Noise filter capacitor CN (Pin 7)
This capacitor prevents errors due to pulse noise.
When an input signal is shorter than the time determined
by TN = CN (µF) ms (BA338 / BA338L) or TN = 20CN (µF)
ms (BA336), the IC will not respond and an output pulse
will not be generated. If pulse noise appears continuous-
ly at the input, the effectiveness of the noise filter will be
decreased. If it is likely that continuous noise will appear,
attach a discharge resistor RN between Pin 7 and GND
(RN y 30k).
There are differences in the noise filter functions of the
BA336 and the BA338 / BA338L. Refer to the section,
“Differences between the noise filters of the BA336 and
BA338 / BA338L”.

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