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BA6800AS Datasheet(Fiches technique) 6 Page - Rohm

Numéro de pièce BA6800AS
Description  Fluorescent display tube level meter driver, 16-point x 2 channel, VU scale, bar display
Télécharger  7 Pages
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Fabricant  ROHM [Rohm]
Site Internet  http://www.rohm.com
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BA6800AS Datasheet(HTML) 6 Page - Rohm

   
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R4
= 7.3
R6
<
5
*0.6
0.6
*
5
*0.6
IB (mA)
R4 (k
Ω)
0.6
R6 (k
Ω)
Fluorescent tube grid current
IB >
hFE
802
Audio ICs
BA6800AS
FTiming chart
(when oscillator frequency is 2kHz)
FAttached components (refer to “Circuit operation”)
C1 and C2 : input coupling capacitors.
VR1 and VR2 : AC sensitivity adjustment and balance ad-
justment (3k
Ω recommended).
C3, R1, C4 and R2 : set the response characteristics with
respect to the AC input signal. In the example given, the
attack time is about 4mS and the release time is about
1sec.
R3 : Pullup resistor for the input switching terminal (pin 8).
R6 and R7 : resistor for the grid leak current path (IGleak).
Set so that IGleak
R6 (R7) < 0.6V.
R4 and R5 : base bias resistors for Q1 and Q2.
Conditions for base bias current (IB) flow are VCC = 5V and
VF = 0.6V :
the base current is given by the following formula.
Set resistors R4 and R6 (R5 and R7) so that
Q1 and Q2 : grid output inverting transistors. Use transis-
tors for which VCEO > VCC
) VEE.
R8 to R25 : Resistors that reverse bias the segments and
grid when the fluorescent tube is not lit.
The application example given is for general cases. Se-
lect the resistors to suit the characteristics of the fluores-
cent tube used.
C5 and R26 : set the oscillator frequency.
Capacitor C5 should be a component with good tempera-
ture characteristics.
FOperation notes
(1)
Adjust the potentiometers VR1 and VR2 (connected
to pins 1 and 3) to adjust the 0dB input level and the dis-
persion of ch1 and ch2.
(2)
The temperature characteristic for the lighting limit
for the 16th LED is shown in Fig. 6.
(3)
The external resistor R26 connected to the oscillator
(pin 30) should be in the range of 20k
Ω and 100kΩ. If it
is outside this range, oscillation may stop due to the influ-
ence of temperature (see Fig. 7).


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