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INA110KUG4 Datasheet(PDF) 9 Page - Texas Instruments |
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INA110KUG4 Datasheet(HTML) 9 Page - Texas Instruments |
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9 / 21 page  INA110 9 SBOS147A www.ti.com GAIN SELECTION Gain selection is accomplished by connecting the appropri- ate pins together on the INA110. Table I shows possible gains from the internal resistors. Keep the connections as short as possible to maintain accuracy. Gains other than 1, 10, 100, 200, and 500 can be set by adding an external resistor, RG, between pin 3 and pins 12, 16, and 11. Gain accuracy is a function of RG and the internal resistors which have a ±20% tolerance with 20ppm/ °C drift. The equation for choosing R G is shown below. Gain can also be changed in the output stage by adding resistance to the feedback loop shown in Figure 4. This is useful for increasing the total gain or reducing the input stage gain to prevent saturation of input amplifiers. The output gain can be changed as shown in Table II. Matching of R1 and R3 is required to maintain high CMR. R2 sets the gain with no effect on CMR. CONNECT PIN 3 GAIN GAIN GAIN TO PIN ACCURACY (%) DRIFT (ppm/ °C) The following gains have assured accuracy: 1 none 0.02 10 10 13 0.05 10 100 12 0.1 20 200 16 0.2 30 500 11 0.5 50 The following gains have typical accuracy as shown: 300 12, 16 0.25 10 600 11, 12 0.25 40 700 11, 16 2 40 800 11, 12, 16 2 80 TABLE I. Internal Gain Connections. are eliminated since they are inside the feedback loop. Proper connection is shown in Figure 1. When more current is to be supplied, a power booster can be placed within the feedback loop as shown in Figure 5. Buffer errors are minimized by the loop gain of the output amplifier. FIGURE 4. Gain Adjustment of Output Stage Using H Pad Attenuator. FIGURE 5. Current Boosting the Output. 3553 1 6 10 INA110 9 V OUT R L ∆V IN 2 I L = 100mA Sense G –1 40k Ω R G = – 50 Ω OUTPUT STAGE GAIN R1 AND R3 R2 21.2k Ω 2.74k Ω 51k Ω 511 Ω 10 1.5k Ω 340 Ω TABLE II. Output Stage Gain Control. COMMON-MODE INPUT RANGE It is important not to exceed the input amplifiers’ dynamic range (see Typical Characteristics). The differential input signal and its associated common-mode voltage should not cause the output of A1 and A2 (input amplifiers) to exceed approximately ±10V with ±15V supplies or nonlinear opera- tion will result. Such large common-mode voltages, when the INA110 is in high gain, can cause saturation of the input stage even though the differential input is very small. This can be avoided by reducing the input stage gain and increas- ing the output stage gain with an H pad attenuator (see Figure 4). OUTPUT SENSE An output sense has been provided to allow greater accuracy in connecting the load. By attaching this feedback point to the load at the load site, IR drops due to load currents that LOW BIAS CURRENT OF FET INPUT ELIMINATES DC ERRORS Because the INA110 has FET inputs, bias currents drawn through input source resistors have a negligible effect on DC accuracy. The picoamp levels produce no more than micro- volts through megohm sources. Thus, input filtering and input series protection are readily achievable. A return path for the input bias currents must always be provided to prevent charging of stray capacitance. Other- wise, the output can wander and saturate. A 1M Ω to 10MΩ resistor from the input to common will return floating sources such as transformers, thermocouples, and AC-coupled inputs (see Applications section). DYNAMIC PERFORMANCE The INA110 is a fast-settling FET input instrumentation amplifier. Therefore, careful attention to minimize stray capacitance is necessary to achieve specified performance. High source resistance will interact with input capacitance to reduce the overall bandwidth. Also, to maintain stability, avoid capacitance from the output to the gain set, offset adjust, and input pins. Applications with balanced-source impedance will provide the best performance. In some applications, mismatched source impedances may be required. If the impedance in the 1 6 10 INA110 9 V OUT R 3 ∆V IN R 2 2 R 1 Output Stage Gain = (R 2 || 20kΩ) + R1 + R3 R 2 || 20kΩ |
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