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INA196AMDBVREP(2) Datasheet(PDF) 11 Page - Texas Instruments |
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INA196AMDBVREP(2) Datasheet(HTML) 11 Page - Texas Instruments |
11 / 20 page www.ti.com Shutdown A2 R L INA193A INA198A - OUT R S A1 0.1 F m Load V+ I L R 1 R 2 V IN+ V IN+ V IN- -16Vto80V Negative and Positive Common-Mode Voltage V+ 3V > Selecting R S Transient Protection INA193A-EP,, INA194A-EP,, INA195A-EP INA196A-EP, INA197A-EP, INA198A-EP SBOS400 – MAY 2007 APPLICATION INFORMATION (continued) Because the INA193A–INA198A consume a quiescent current less than 1 mA, they can be powered by either the output of logic gates or by transistor switches to supply power. Use a totem pole output buffer or gate that can provide sufficient drive along with 0.1 µF bypass capacitor, preferably ceramic with good high frequency characteristics. This gate should have a supply voltage of 3 V or greater because the INA193A–INA198A requires a minimum supply greater than 2.7 V. In addition to eliminating quiescent current, this gate also turns off the 10 µA bias current present at each of the inputs. An example shutdown circuit is shown in Figure 4. Figure 4. INA193A–INA198A Example Shutdown Circuit The value chosen for the shunt resistor, RS, depends on the application and is a compromise between small-signal accuracy and maximum permissible voltage loss in the measurement line. High values of RS provide better accuracy at lower currents by minimizing the effects of offset, while low values of RS minimize voltage loss in the supply line. For most applications, best performance is attained with an RS value that provides a full-scale shunt voltage range of 50 mV to 100 mV. Maximum input voltage for accurate measurements is 500 mV. The –16 V to 80 V common-mode range of the INA193A–INA198A is ideal for withstanding automotive fault conditions ranging from 12 V battery reversal up to 80 V transients, since no additional protective components are needed up to those levels. In the event that the INA193A–INA198A is exposed to transients on the inputs in excess of its ratings, then external transient absorption with semiconductor transient absorbers (zeners or Transzorbs) will be necessary. Use of MOVs or VDRs is not recommended except when they are used in addition to a semiconductor transient absorber. Select the transient absorber such that it will never allow the INA193A–INA198A to be exposed to transients greater than 80 V (that is, allow for transient absorber tolerance, as well as additional voltage due to transient absorber dynamic impedance). Despite the use of internal zener type ESD protection, the INA193A–INA198A does not lend itself to using external resistors in series with the inputs since the internal gain resistors can vary up to ±30%. (If gain accuracy is not important, then resistors can be added in series with the INA193A–INA198A inputs with two equal resistors on each input.) 11 Submit Documentation Feedback |
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