8

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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 3.9k

Ω 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

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

lower temperatures (metal can and plastic), for example, at

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.

FIGURE 6. OPEN LOOP VOLTAGE GAIN AND PHASE vs

FREQUENCY

FIGURE 7. INPUT CURRENT vs TEMPERATURE

FIGURE 8. OUTPUT VOLTAGE SWING CAPABILITY AND COMMON MODE INPUT VOLTAGE RANGE vs SUPPLY VOLTAGE

FREQUENCY (Hz)

100

80

60

40

20

0

-75

-90

-105

-120

-135

-150

φOL

-60

-40

-20

0

20

40

60

80

100

120

140

1K

100

1

10K

10

SUPPLY VOLTAGE (V+, V-)

0

5

10

15

20

25

-1.5

-2.0

-1.0

-2.5

-3.0

0

-0.5

SUPPLY VOLTAGE (V+, V-)

0

5

10

15

20

25

0

-0.5

0.5

-1.0

-1.5

1.5

1.0

CA3140, CA3140A