Moteur de recherche de fiches techniques de composants électroniques
Selected language     French  ▼

Delete All


Preview PDF Download HTML

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
Scroll/Zoom Zoom In 100% Zoom Out
Fabricant  ROHM [Rohm]
Site Internet

BA6800AS Datasheet(HTML) 6 Page - Rohm

Zoom Inzoom in Zoom Outzoom out
 6 / 7 page
background image
= 7.3
IB (mA)
R4 (k
R6 (k
Fluorescent tube grid current
IB >
Audio ICs
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
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
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.
The temperature characteristic for the lighting limit
for the 16th LED is shown in Fig. 6.
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).

Html Pages

1  2  3  4  5  6  7 

Datasheet Download

Lien URL

Privacy Policy
AllDATASHEET vous a-t-il été utile ?   [ DONATE ]  

À propos de Alldatasheet   |   Publicit   |   Contactez-nous   |   Politique de confidentialit   |   Echange de liens   |   Manufacturer List
All Rights Reserved©

Mirror Sites
English :  |   English :  |   Chinese :  |   German :  |   Japanese :
Russian :  |   Korean :  |   Spanish :  |   French :  |   Italian :
Portuguese :  |   Polish :  |   Vietnamese :