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參數(shù)資料
| 型號(hào)： | BA6899AS |
| 英文描述： | Servo/Spindle Motor Controller/Driver |
| 中文描述： | 伺服/主軸電機(jī)控制器/驅(qū)動(dòng)器 |
| 文件頁(yè)數(shù)： | 5/6頁(yè) |
| 文件大?。?/td> | 84K |
| 代理商： | BA6899AS |
660
Audio ICs
BA689
Application example (DC input)
DC input is input directly to pin 3 (see Fig. 4). However,
when the input level is high, connect the input directly to
the amplifier output (pin 4) as shown in Fig. 5. When this
is done dispersion of the rectifier amplifier gain ceases to
be a factor, and the comparator dispersion becomes ex-
tremely small.
If the resistance of the 100k
VR shown in Fig. 5 be-
comes too small, the discharge time constant deter-
mined by R
1
and C
1
will change, and the response time
will vary. The maximum input level to pin 4 is 6V.
Operation notes
(1)
LED connection
Connect the LEDs as indicated in Fig. 2. Note that the
connection methods are different for bar and dot dis-
plays, and that in the case of bar display, pin 18 is open,
while for dot display, pin 18 is connected to GND.
When using different color LEDs that have different cur-
rent values (e.g. green for the lower 10 LEDs and red for
the top two) set the value of the current to the larger LED
current using the external resistor, and adjust the current
value for LEDs that require a smaller current by connect-
ing resistors in parallel them.
If you wish to remove LEDs, be certain to short unused
LEDs.
(2)
The LED current is set using R
1
. The relationship be-
tween the value of R
1
and the typical LED current is given
in Fig. 3.
(3)
Comparator voltage
In the case of the BA689, the comparator voltage is the
input voltage when about half LED current setting value
(typ.) is flowing in an LED.
Therefore, if the LED current is set to 16mA, the
comparator voltage is the value when 8mA is flowing in
the LED.
LED current adjustment
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