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參數(shù)資料
| 型號： | BA6803 |
| 廠商： | Rohm CO.,LTD. |
| 英文描述： | Fluorescent display tube level meter driver, 16-point x 2 channel, VU scale, bar display |
| 中文描述： | 熒光顯示管電平表驅(qū)動器，16點× 2通道，維旺迪規(guī)模，酒吧顯示屏 |
| 文件頁數(shù)： | 6/7頁 |
| 文件大?。?/td> | 126K |
| 代理商： | BA6803 |
R
4
R
6
= 7.3
<
5
0.6
0.6
5
R
4
(k
)
0.6
I
B
(mA)
0.6
R
6
(k
)
Fluorescent tube grid current
h
FE
I
B
>
816
Audio ICs
BA6803S
Timing chart
BA6803S (when oscillator frequency is 2kHz)
Attached components (refer to “Circuit operation”)
C
1
and C
2
: input coupling capacitors.
VR
1
and VR
2
: AC sensitivity adjustment and balance ad-
justment (3k
recommended).
C
3
, R
1
, C
4
and R
2
: 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.
R
3
: Pullup resistor for the input switching terminal (pin 8).
R
6
and R
7
: resistor for the grid leak current path
(I
Gleak
).Set so that I
Gleak
x R
6
(R
7
) < 0.6V.
R
4
and R
5
: base bias resistors for Q
1
and Q
2
.
Conditions for base bias current (IB) flow are V
CC
= 5V
and V
F
= 0.6V:
the base current is given by the following formula.
Set resistors R
4
and R
6
(R
5
and R
7
) so that
Q
1
and Q
2
: grid output inverting transistors. Use transis-
tors for which V
CEO
> V
CC
V
EE
.
R
8
to R
25
: Resistors that reverse bias the segments and
grid when the fluorescent tube is not lit. The application
example given is for general cases. Select the resistors
to suit the characteristics of the fluorescent tube used.
C
5
and R
26
: set the oscillator frequency.
Capacitor C
5
should be a component with good tempera-
ture characteristics.
Operation notes
1) Adjust the potentiometers VR
1
and VR
2
(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 R
26
connected to the oscillator
(pin 30) should be in the range of 20k
and 100k
. If it
is outside this range, oscillation may stop due to the influ-
ence of temperature (see Fig. 7).
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| BA6803S | 制造商:ROHM 制造商全稱:Rohm 功能描述:Fluorescent display tube level meter driver, 16-point x 2 channel, VU scale, bar display |
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| BA6810 | 制造商:ROHM 制造商全稱:Rohm 功能描述:Fluorescent display tube level meter driver, 12-point x 2 channel, VU scale, bar display |
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