CA3094 Просмотр технического описания (PDF) - Intersil
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CA3094 Datasheet PDF : 14 Pages
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Typical Applications
CA3094, CA3094A, CA3094B
Z1
EIN
Z2
-
CA3094
+
EIN
EOUT
(NOTE)
Where
E----E-O----I-U-N----T--
=
f
ZZ----21--
depends on the characteristics of Z1 and Z2
Where EOUT = EIN
+
CA3094
-
EOUT
(NOTE)
NOTE: In single-ended output operation, the CA3094 may require a pull up or pull down resistor.
FIGURE 11A. INVERTING OP AMP
FIGURE 11B. NON-INVERTING MODE, AS A FOLLOWER
FIGURE 11. APPLICATION OF THE CA3094
V+ = 18V
VOLTAGE A
2/3V+
0
+18
0
VOLTAGE AT
TERMINAL 8
S1
R
II
A
1N914
12V
C
RABC
220kΩ
R1
100kΩ
5
7
8
2
+
3
R2
220kΩ
CA3094
-
6
4
2kΩ
PULL UP
Problem: To calculate the maximum value of R required to
switch a 100mA output current comparator
Given: IABC = 5µA, RABC = 3.6MΩ ≈ 5-1---8µ----VA---
EOUT
II = 500nA at IABC = 100µA (from Figure 3)
II = 5µA can be determined by drawing a line on Figure 3 through
IABC = 100µA and IB = 500nA parallel to the typical TA = 25oC
curve.
Then: II = 33nA at IABC = 5µA
RMAX = 1----8---3V---3---–-n----1A---2----V-- = 180 MΩ at TA = 25oC
RMAX = 180MΩ × 2 ⁄ 3† = 120M Ω at TA = –55oC
TIME DELAY (s) = RC (APPROX.)
† Ratio of II at TA = 25oC to II at TA = -55oC for any given value
of IABC
FIGURE 12. RC TIMER
V+
A
0
V+
INPUT
A
100
kΩ
270
0.01µF
kΩ
B
100
kΩ
12VDC
C
1N914
100
kΩ 100
kΩ
R1
1MΩ
D
R2
2.2MΩ
3
2
R3
1MΩ
220kΩ
7
8
+
5
CA3094
6
-
4
0
B
C0
3/4V+
C1
0.5µF
E
EOUT
RLOAD
2kΩ
D0
V+
E0
On a negative going transient at input (A), a negative
pulse at C will turn “on” the CA3094, and the output (E)
will go from a low to a high level.
At the end of the time constant determined by C1, R1,
R2, R3, the CA3094 will return to the “off” state and the
output will be pulled low by RLOAD. This condition will
be independent of the interval when input (A) returns
to a high level.
FIGURE 13. RC TIMER TRIGGERED BY EXTERNAL NEGATIVE PULSE
3-7
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