CA3140 Ver la hoja de datos (PDF) - Intersil
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CA3140 Datasheet PDF : 22 Pages
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CA3140, CA3140A
the CA3140 is used as a unity gain voltage follower. This
resistance prevents the possibility of extremely large input
signal transients from forcing a signal through the input
protection network and directly driving the internal constant
current source which could result in positive feedback via the
output terminal. A 3.9kΩ resistor is sufficient.
The typical input current is on the order of 10pA when the
inputs are centered at nominal device dissipation. As the
output supplies load current, device dissipation will increase,
raising the chip temperature and resulting in increased input
current. Figure 7 shows typical input terminal current versus
ambient temperature for the CA3140.
It is well known that MOSFET devices can exhibit slight
changes in characteristics (for example, small changes in
SUPPLY VOLTAGE:
TA = 25oC
VS = ±15V
100
φOL
80
60
RL = 2kΩ,
40
CL = 100pF
RL = 2kΩ,
CL = 0pF
-75
-90
-105
-120
-135
-150
20
0
101 102 103 104 105 106 107 108
FREQUENCY (Hz)
FIGURE 6. OPEN LOOP VOLTAGE GAIN AND PHASE vs
FREQUENCY
input offset voltage) due to the application of large
differential input voltages that are sustained over long
periods at elevated temperatures.
Both applied voltage and temperature accelerate these
changes. The process is reversible and offset voltage shifts of
the opposite polarity reverse the offset. Figure 9 shows the
typical offset voltage change as a function of various stress
voltages at the maximum rating of 125oC (for metal can); at
lower temperatures (metal can and plastic), for example, at
85oC, this change in voltage is considerably less. In typical
linear applications, where the differential voltage is small and
symmetrical, these incremental changes are of about the
same magnitude as those encountered in an operational
amplifier employing a bipolar transistor input stage.
10K
SUPPLY VOLTAGE: VS = ±15V
1K
100
10
1
-60 -40 -20
0 20 40 60 80 100 120 140
TEMPERATURE (oC)
FIGURE 7. INPUT CURRENT vs TEMPERATURE
RL = ∞
0
-0.5 +VICR AT TA = 125oC
+VICR AT TA = 25oC
-1.0 +VICR AT TA = -55oC
-1.5
-2.0
-2.5
-3.0
+VOUT AT TA = 125oC
+VOUT AT TA = 25oC
+VOUT AT TA = -55oC
1.5
1.0
0.5 -VOUT FOR
TA = -55oC to 125oC
0
-0.5
-1.0
-1.5
-VICR AT TA = 125oC
-VICR AT TA = 25oC
-VICR AT TA = -55oC
0
5
10
15
20
25
SUPPLY VOLTAGE (V+, V-)
0
5
10
15
20
25
SUPPLY VOLTAGE (V+, V-)
FIGURE 8. OUTPUT VOLTAGE SWING CAPABILITY AND COMMON MODE INPUT VOLTAGE RANGE vs SUPPLY VOLTAGE
8
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