CA3060
Circuit Description
Typical Applications
Figure 23 shows the block diagram of a tri-level comparator
using the CA3060. Two of the three amplifiers are used to
compare the input signal with the upper limit and lower limit
reference voltages. The third amplifier is used to compare
the input signal with a selected value of intermediate limit
reference voltage. By appropriate selection of resistance
ratios this intermediate limit may be set to any voltage
between the upper limit and lower limit values. The output of
the upper limit and lower limit comparator sets the corre-
sponding upper or lower limit flip-flop. The activated flip-flop
retains its state until the third comparator (intermediate limit)
in the CA3060 initiates a reset function, thereby indicating
that the signal voltage has returned to the intermediate limit
selected. The flip-flops employ two CA3086 transistor array
ICs, with circuitry to provide separate “SET” and “POSITIVE
OUTPUT” terminals.
Having determined the operating points of the CA3060
amplifiers, they can now function in the same manner as
conventional op amps, and thus, are well suited for most op
amp applications, including inverting and non-inverting
amplifiers, integrators, differentiators, summing amplifiers
etc.
Tri-Level Comparator
Tri-level comparator circuits are an ideal application for the
CA3060 since it contains the requisite three amplifiers. A tri-
level comparator has three adjustable limits. If either the
upper lower limit is exceeded, the appropriate output is
activated until the input signal returns to a selected
intermediate limit. Tri-level comparators are particularly
suited to many industrial control applications.
SATURATES WHEN
V+ = 6V
V+ = 6V
UPPER LIMIT IS
EXCEEDED
3
INPUT SIGNAL
(E )
S
100
CA3086
REGULATOR
IN CA3060
1
LOAD
4.7K
8
20K
10K
V+ = 6V
2
8
6
5.1K
Q
1
25K
I
ABC
15
7
V- = -6V
SET
5.1K
5.1K
150K
5
1
13K
+
14
13
1/3
CA3060
16
11
9
10
4
2
E
WHEN
U
-
UPPER
LIMIT IS
R
10K
3
4
I
ABC
EXCEEDED
14
13
12
UPPER LIMIT
FLIP-FLOP
10
R
2
5.1K
1K
-
12
11
RESET
1/3
CA3060
UPPER LIMIT
REFERENCE
VOLTAGE
9
SATURATES WHEN
LOWER LIMIT IS
EXCEEDED
WHEN INTERMEDIATE REFERENCE
LIMIT IS EXCEEDED
V+ = 6V
+
100
CA3086
INTERMEDIATE LIMIT
REFERENCE VOLTAGE
LOAD
8
4.7K
150K
10K
E
- E
L
U
R
10K
3
I
2
ABC
6
Q
2
6
LOWER LIMIT
REFERENCE
VOLTAGE
7
5.1K
5.1K
5.1K
5
1
4
5
-
SET
E
L
1/3
7
10
11
9
4
2
CA3060
+
WHEN
LOWER
LIMIT IS
EXCEEDED
3
13
12
14
LOWER LIMIT
FLIP-FLOP
R
1K
1
NOTES:
9. Items in dashed boxes are external to the CA3086.
All resistance values are in ohms.
10.
E
E
> E = Q (ON), Q (OFF)
U 1 2
S
L
E
– E
L
2
U
-------------------
= Q (OFF), Q (OFF)
1 2
E
<
< E = Q (ON), Q (OFF)
S
U
2
1
FIGURE 22. TRI-LEVEL COMPARATOR CIRCUIT
3-9
HARRIS [ HARRIS CORPORATION ]
