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CA3130A Arkusz danych(PDF) 6 Page - Intersil Corporation |
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CA3130A Arkusz danych(HTML) 6 Page - Intersil Corporation |
6 / 17 page 6 Input Current Variation with Common Mode Input Voltage As shown in the Table of Electrical Specifications, the input current for the CA3130 Series Op Amps is typically 5pA at TA = 25oC when Terminals 2 and 3 are at a common-mode potential of +7.5V with respect to negative supply Terminal 4. Figure 3 contains data showing the variation of input current as a function of common-mode input voltage at TA = 25oC. These data show that circuit designers can advantageously exploit these characteristics to design circuits which typically require an input current of less than 1pA, provided the common-mode input voltage does not exceed 2V. As previously noted, the input current is essentially the result of the leakage current through the gate-protection diodes in the input circuit and, therefore, a function of the applied voltage. Although the finite resistance of the glass terminal-to-case insulator of the metal can package also contributes an increment of leakage current, there are useful compensating factors. Because the gate-protection network functions as if it is connected to Terminal 4 potential, and the Metal Can case of the CA3130 is also internally tied to Terminal 4, input Terminal 3 is essentially “guarded” from spurious leakage currents. Offset Nulling Offset-voltage nulling is usually accomplished with a 100,000 Ω potentiometer connected across Terminals 1 and 5 and with the potentiometer slider arm connected to Terminal 4. A fine offset-null adjustment usually can be effected with the slider arm positioned in the mid-point of the potentiometer’s total range. Input-Current Variation with Temperature The input current of the CA3130 Series circuits is typically 5pA at 25oC. The major portion of this input current is due to leakage current through the gate-protective diodes in the input circuit. As with any semiconductor-junction device, including op amps with a junction-FET input stage, the leakage current approximately doubles for every 10oC increase in temperature. Figure 4 provides data on the typical variation of input bias current as a function of temperature in the CA3130. In applications requiring the lowest practical input current and incremental increases in current because of “warm-up” effects, it is suggested that an appropriate heat sink be used with the CA3130. In addition, when “sinking” or “sourcing” significant output current the chip temperature increases, causing an increase in the input current. In such cases, heat- sinking can also very markedly reduce and stabilize input current variations. Input Offset Voltage (VIO) Variation with DC Bias and Device Operating Life It is well known that the characteristics of a MOSFET device can change slightly when a DC gate-source bias potential is applied to the device for extended time periods. The magnitude of the change is increased at high temperatures. Users of the CA3130 should be alert to the possible impacts of this effect if the application of the device involves extended operation at high temperatures with a significant differential DC bias voltage applied across Terminals 2 and 3. Figure 5 shows typical data pertinent to shifts in offset voltage encountered with CA3130 devices (metal can package) during life testing. 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. The 2VDC differential voltage example represents conditions when the amplifier output stage is “toggled”, e.g., as in comparator applications. 10 7.5 5 2.5 0 -1 012 3456 7 INPUT CURRENT (pA) TA = 25 oC 3 2 7 4 8 6 PA VIN CA3130 15V TO 5V 0V TO -10V V+ V- FIGURE 3. INPUT CURRENT vs COMMON-MODE VOLTAGE VS = ±7.5V 4000 1000 100 10 1 -80 -60 -40 -20 0 20 40 60 80 100 120 140 TEMPERATURE (oC) FIGURE 4. INPUT CURRENT vs TEMPERATURE CA3130, CA3130A |
Podobny numer części - CA3130A |
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Podobny opis - CA3130A |
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