參數(shù)資料
型號(hào)： HA17901PJ
廠商： Hitachi,Ltd.
元件分類(lèi)： 比較器
英文描述： Quadruple Comparators
中文描述： 四重比較
文件頁(yè)數(shù)： 12/16頁(yè)
文件大?。?/td> 79K
代理商： HA17901PJ
HA17901, HA17339 Series
12
V
CC
–
+
V
CC
+V
C
V
CC
/2
V
CC
/2
V
CC
V
CC
A
3
A
1
A
2
50k
Frequency
control
voltage
input
V
= 30V
+250mV
<
+V
<
+50V
700Hz
<
/
<
100kHz
Output 2
Output 1
10
100k
20k
5.1k
3k
V
CC
3k
100k
20k
0.1
μ
HA17901
–
+
HA17901
0.01
μ
500p
HA17901
–
+
Figure 5 Voltage Controlled Oscillator
4. Basic Comparator
The circuit shown in figure 6 is a basic comparator. When the input voltage V
IN
exceeds the reference
voltage V
REF
, the output goes to the high level.
+
–
V
CC
3k
Vin
V
REF
Figure 6 Basic Comparator
5. Noninverting Comparator (with Hysteresis)
Assuming +V
IN
is 0V, when V
REF
is applied to the inverting input, the output will go to the low level
(approximately 0V). If the voltage applied to +V
IN
is gradually increased, the output will go high when
the value of the noninverting input, +V
IN
×
R
2
/(R
1
+ R
2
), exceeds +V
REF
. Next, if +V
IN
is gradually
lowered, Vout will be inverted to the low level once again when the value of the noninverting input,
(Vout – V
IN
)
×
R
1
/(R
1
+ R
2
), becomes lower than V
REF
. With the circuit constants shown in figure 7,
assuming V
CC
= 15V and +V
REF
= 6V, the following formula can be derived, i.e. +V
IN
×
10M/(5.1M +
10M)
>
6V, and Vout will invert from low to high when +V
IN
is > 9.06V.
R
1
R
1
+ R
2
(Vout – V
IN
)
×
(Assuming Vout = 15V)
+ V
IN
<
6V
When +V
IN
is lowered, the output will invert from high to low when +V
IN
<
1.41V. Therefore this
circuit has a hysteresis of 7.65V. Figure 8 shows the input characteristics.
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