CA3060 Datasheet, PDF (9/12 Pages) Intersil Corporation – 110kHz, Operational Transconductance Amplifier Array

CA3060
Typical Applications
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.
Circuit Description
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.
INPUT SIGNAL
(E_S)
V+ = 6V
13K
E_U
R₂
1K
UPPER LIMIT
REFERENCE
VOLTAGE
LOWER LIMIT
REFERENCE
VOLTAGE
E_L
R₁
1K
5.1K
14
5.1K
13
R₄
10K
5.1K
12
11
V+ = 6V
3
1
REGULATOR
IN CA3060
CA3086
20K
I_ABC
15
+
1/3
CA3060
-
10
-
1/3
CA3060
+
16
I_ABC
9
2
8
25K
V- = -6V
SET
11 9
10
WHEN
UPPER
LIMIT IS
EXCEEDED
UPPER LIMIT
FLIP-FLOP
RESET
WHEN INTERMEDIATE REFERENCE
LIMIT IS EXCEEDED
INTERMEDIATE LIMIT
REFERENCE VOLTAGE
R₃
10K
E_U - E_L
2
I_ABC
6
CA3086
5.1K
4
5.1K
5
-
1/3
CA3060
+
SET
7
WHEN
LOWER
LIMIT IS
EXCEEDED
10
11 9
LOWER LIMIT
FLIP-FLOP
V+ = 6V
10K
5.1K
SATURATES WHEN
UPPER LIMIT IS
EXCEEDED
100
LOAD
4.7K
8
6
Q₁
51
4
2
7
150K
3
13
12 14
V+ = 6V
4.7K
150K
SATURATES WHEN
LOWER LIMIT IS
EXCEEDED
100
LOAD
10K
8
6
Q₂
51
7
5.1K
4
2
3
12 14
13
NOTES:
9. Items in dashed boxes are external to the CA3086.
All resistance values are in ohms.
10. _{ES > EU= Q1(ON), Q2(OFF)}
E_L < E_U= Q₂(ON), Q₁(OFF)
ES < -^E---^U-----₂-–----^E----^L- = Q₁(OFF), Q₂(OFF)
FIGURE 22. TRI-LEVEL COMPARATOR CIRCUIT
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