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參數(shù)資料
| 型號(hào)： | BA6800 |
| 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(dòng)器，16點(diǎn)× 2通道，維旺迪規(guī)模，酒吧顯示屏 |
| 文件頁(yè)數(shù)： | 6/7頁(yè) |
| 文件大?。?/td> | 129K |
| 代理商： | BA6800 |
R
4
R
6
= 7.3
<
5
0.6
0.6
5
0.6
I
B
(mA)
R
4
(k
)
0.6
R
6
(k
)
Fluorescent tube grid current
h
FE
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
.
R8 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. Se-
lect the resistors to suit the characteristics of the fluores-
cent tube used.
C
5
and R
26
: set the oscillator frequency.
Capacitor C
5
should be a component with good tempera-
ture characteristics.
I
B
>
809
Audio ICs
BA6800AF
Timing chart
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 7).
R
6
and R
7
: resistor for the grid leak current path (I
Gleak
).
Set so that I
Gleak
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 (I
B
) flow are V
CC
= 5V and
V
F
= 0.6V :
the base current is given by the following formula.
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 R26 connected to the oscilla-
tor (pin 28) should be in the range of 20k
and 100k
.
If it is outside this range, oscillation may stop due to the
influence of temperature (see Fig. 7).
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