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CA3140MZ96 Datasheet(PDF) 9 Page - Intersil Corporation |
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CA3140MZ96 Datasheet(HTML) 9 Page - Intersil Corporation |
9 / 23 page 9 FN957.10 July 11, 2005 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 3.9k 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 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. 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 101 103 104 105 106 107 108 FREQUENCY (Hz) 100 80 60 40 20 0 SUPPLY VOLTAGE: VS = ±15V TA = 25 oC 102 -75 -90 -105 -120 -135 -150 RL = 2kΩ, CL = 0pF RL = 2kΩ, CL = 100pF φOL SUPPLY VOLTAGE: VS = ±15V TEMPERATURE (oC) -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 RL = ∞ +VOUT AT TA = 125 oC +VOUT AT TA = 25 oC +VOUT AT TA = -55 oC +VICR AT TA = 125 oC +VICR AT TA = 25 oC +VICR AT TA = -55 oC -3.0 0 -0.5 SUPPLY VOLTAGE (V+, V-) 0 5 10 15 20 25 -VICR AT TA = 125 oC -VICR AT TA = 25 oC -VICR AT TA = -55 oC -VOUT FOR TA = -55 oC to 125oC 0 -0.5 0.5 -1.0 -1.5 1.5 1.0 CA3140, CA3140A |
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