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INA170 Datasheet(PDF) 7 Page - Burr-Brown (TI) |
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INA170 Datasheet(HTML) 7 Page - Burr-Brown (TI) |
7 / 10 page INA170 7 SBOS193B www.ti.com 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 of 50mV to 100mV. Maximum input voltage for accurate measurements is 500mV. RL is chosen to provide the desired full-scale output voltage. The output impedance of the INA170 Out terminal is very high which permits using values of RL up to 100kΩ with excellent accuracy. The input impedance of any additional circuitry at the output should be much higher than the value of RL to avoid degrading accuracy. Some Analog-to-Digital (A/D) converters have input imped- ances that will significantly affect measurement gain. The input impedance of the A/D converter can be included as part of the effective RL if its input can be modeled as a resistor to ground. Alternatively, an op-amp can be used to buffer the A/D converter input, as shown in Figure 2. See Figure 1 for recommended values of RL. OUTPUT VOLTAGE RANGE The output of the INA170 is a current, which is converted to a voltage by the load resistor, RL. The output current remains accurate within the compliance voltage range of the output circuitry. The shunt voltage and the input common-mode and power supply voltages limit the maximum possible output swing. The maximum output voltage compliance is limited by the lower of the two equations below: Vout max = (V+) – 0.7V – (VIN + – V IN – ) (5) or Vout max = VIN – – 0.5V (6) (whichever is lower) BANDWIDTH Measurement bandwidth is affected by the value of the load resistor, RL. High gain produced by high values of RL will yield a narrower measurement bandwidth (see Typical Per- formance Curves). For widest possible bandwidth, keep the capacitive load on the output to a minimum. If bandwidth limiting (filtering) is desired, a capacitor can be added to the output, as shown in Figure 3. This will not cause instability. APPLICATIONS The INA170 is designed for current shunt measurement circuits as shown in Figure 1, but its basic function is useful in a wide range of circuitry. A creative engineer will find many unforeseen uses in measurement and level shifting circuits. FIGURE 4. Offsetting the Output Voltage. FIGURE 2. Buffering Output to Drive A/D Converter. FIGURE 3. Output Filter. I S OPA340 INA170 2 1 4 6 Z IN R L Buffer of amp drives A/D converter without affecting gain. INA170 f –3dB = 1 2 πR LCL V O f –3dB R L C L 2 1 4 6 V 0 V REF R L 6 Gain Set by R L Output Offset Current = V REF R OS Output Offset Voltage = • R L V REF R OS INA170 2 1 4 5 3 I S R OS |
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