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BA338 데이터시트(PDF) 6 Page - Rohm

부품명 BA338
상세설명  Mute detector IC
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제조업체  ROHM [Rohm]
홈페이지  http://www.rohm.com
Logo ROHM - Rohm

BA338 데이터시트(HTML) 6 Page - Rohm

  BA338 Datasheet HTML 1Page - Rohm BA338 Datasheet HTML 2Page - Rohm BA338 Datasheet HTML 3Page - Rohm BA338 Datasheet HTML 4Page - Rohm BA338 Datasheet HTML 5Page - Rohm BA338 Datasheet HTML 6Page - Rohm BA338 Datasheet HTML 7Page - Rohm  
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731
Audio ICs
BA336 / BA338 / BA338L
(5)
Capacitor CW and resistor RW (Pin 1) for setting out-
put pulse width
The relation between CW, RW and the output pulse width
TW is as follows :
TW 0.69
CW (
µF) RW (kΩ) ms
TW is almost independent of the supply voltage.
If RW is small (less than 10k
Ω), errors increase.
See Fig. 8.
(6)
Capacitor CD and resistor RD (Pin 2) for setting song
gap detection time
The relation between CD, RD and the detection time TD
(the duration from the point when the input signal goes
below the input decision level to the generation of the out-
put pulse) is as follows :
BA336 :
TD = 0.69
CD (
µF) RD (kΩ)
BA338 / BA338L :
TD = 0.69
CD (
µF) RD (kΩ)
TD = =
)0.15 CN (µF) RN (kΩ)
(The internal resistor RN is 25 to 100k
Ω.)
TD is almost independent of the supply voltage.
If RD is small (less than 10k
Ω), errors increase.
See Fig. 8.
If a CN is added in the case of the BA338 / BA338L, its
discharge time will cause TD to be slightly longer than it
is when CN = 0.
Caution is required if TD is made short or a large CN is
used. (See Fig. 9).
FOperation notes
(1)
The input decision level of the BA336 / BA338 /
BA338L is a highly sensitive -52dBm. This can cause the
output current to return to the input through the common
impedance of the ground line. Be sure to decouple the
power supply line and prevent common impedance with
the ground line. Adding a 0.1
µF capacitor between Pin 8
and GND is effective, and we strongly recommend doing
so when high current is used.
(2)
The maximum output current of the BA336 /
BA338 / BA338L can be up to 150mA (typical). However,
if left in the current limited state for a long time when using
a high voltage power supply, damage to the IC can result.
Be sure not to exceed the rated power dissipation and the
over-current protection time.
(3)
When the BA336 / BA338 / BA338L is input into a
counter IC, make sure the input is above the 2VF thresh-
old (approximately 1.3V). Otherwise, there is a possibility
that a miscount will occur due to the output pulse gener-
ated (approximately 0.5V, see Fig. 4) when the power is
turned on or off.
FDifferences between the noise filters of the BA336
and BA338 / BA338L
The basic configurations of the BA336 and BA338 /
BA338L are the same, however, the noise filters are dif-
ferent.
BA336
The noise filter only operates from the time the
power is turned on or muting is turned off to the
arrival of the input signal. The power must be
turned off or muting turned on each time an out-
put signal is generated.
BA338 / BA338L The noise filter operates continuously
while the power is on. However, as
noted previously the song gap detec-
tion time can change slightly due to
the capacitor CN connected to the
noise filter pin.


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