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INA200 Datasheet(PDF) 10 Page - Burr-Brown (TI) |
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INA200 Datasheet(HTML) 10 Page - Burr-Brown (TI) |
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10 / 22 page  INA200 INA201 INA202 SBOS374 − NOVEMBER 2006 www.ti.com 10 APPLICATIONS INFORMATION BASIC CONNECTIONS Figure 2 shows the basic connections of the INA200, INA201, and INA202. The input pins, VIN+ and VIN−, should be connected as closely as possible to the shunt resistor to minimize any resistance in series with the shunt resistance. Power-supply bypass capacitors are required for stability. Applications with noisy or high-impedance power supplies may require additional decoupling capacitors to reject power-supply noise. Connect bypass capacitors close to the device pins. POWER SUPPLY The input circuitry of the INA200, INA201, and INA202 can accurately measure beyond the power-supply voltage, V+. For example, the V+ power supply can be 5V, whereas the load power-supply voltage is up to +80V. The output voltage range of the OUT terminal, however, is limited by the voltages on the power-supply pin. ACCURACY VARIATIONS AS A RESULT OF VSENSE AND COMMON-MODE VOLTAGE The accuracy of the INA200, INA201, and INA202 current shunt monitors is a function of two main variables: VSENSE (VIN+ − VIN−) and common-mode voltage, VCM, relative to the supply voltage, VS. VCM is expressed as (VIN+ + VIN−)/2; however, in practice, VCM is seen as the voltage at VIN+ because the voltage drop across VSENSE is usually small. This section addresses the accuracy of these specific operating regions: Normal Case 1: VSENSE ≥ 20mV, VCM ≥ VS Normal Case 2: VSENSE ≥ 20mV, VCM < VS Low VSENSE Case 1: VSENSE < 20mV, −16V ≤ VCM < 0 Low VSENSE Case 2: VSENSE < 20mV, 0V ≤ VCM ≤ VS Low VSENSE Case 3: VSENSE < 20mV, VS < VCM ≤ 80V Normal Case 1: VSENSE ≥ 20mV, VCM ≥ VS This region of operation provides the highest accuracy. Here, the input offset voltage is characterized and measured using a two-step method. First, the gain is determined by Equation 1. G + V OUT1 * VOUT2 100mV * 20mV where: VOUT1 = Output Voltage with VSENSE = 100mV VOUT2 = Output Voltage with VSENSE = 20mV Then the offset voltage is measured at VSENSE = 100mV and referred to the input (RTI) of the current shunt monitor, as shown in Equation 2. V OSRTI (Referred−To−Input) + V OUT1 G * 100mV G 0.6V Reference Comparator OUT CMP IN CMP OUT RESET V IN − V IN+ INA200 (G = 20) GND V+ 2 3 4 6 5 7 8 1 R PULL−UP 4.7k Ω Latch Transparent/Reset C BYPASS 0.01 µF R SHUNT 3m Ω Load Supply −18V to +80V Load 5V Supply R 1 R 2 Figure 2. INA200 Basic Connections (1) (2) |
Similar Part No. - INA200_07 |
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Similar Description - INA200_07 |
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