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INA204A Datasheet(PDF) 11 Page - Burr-Brown (TI) |
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INA204A Datasheet(HTML) 11 Page - Burr-Brown (TI) |
11 / 25 page www.ti.com APPLICATIONS INFORMATION BASIC CONNECTIONS Normal Case 1: VSENSE ≥ 20mV, VCM ≥ VS POWER SUPPLY G= V V - OUT1 OUT2 100mV 20mV - (1) ACCURACY VARIATIONS AS A RESULT OF V RTI(Referred-To-Input)= OS V OUT1 G - 100mV (2) INA203 x20 R SHUNT 3mW LoadSupply - 18Vto+80V Load 5VSupply OptionalDelay Capacitor 0.2 F m C BYPASS 0.01 F m V S OUT CMP1IN /0.6REF - CMP1IN+ CMP2IN+ CMP2IN /0.6REF - GND V IN+ V IN- 1.2VREFOUT CMP1OUT CMP2OUT CMP2DELAY CMP1 RESET CurrentShunt MonitorOutput 1.2VREF R PULL-UP 4.7kW R PULL-UP 4.7kW Transparent/Reset Latch INA203 INA204 INA205 SBOS393 – MARCH 2007 This section addresses the accuracy of these specific operating regions: • Normal Case 1: V SENSE ≥ 20mV, VCM ≥ VS Figure 30 shows the basic connections of the • Normal Case 2: V SENSE ≥ 20mV, VCM < VS INA203, INA204, and INA205. The input pins, VIN+ and VIN–, should be connected as closely as possible • Low V SENSE Case 1: VSENSE < 20mV, –16V ≤ VCM to the shunt resistor to minimize any resistance in < 0 series with the shunt resistance. • Low V SENSE Case 2: VSENSE < 20mV, 0V ≤ VCM ≤ VS Power-supply bypass capacitors are required for • Low V SENSE Case 3: VSENSE < 20mV, VS < VCM ≤ stability. Applications with noisy or high-impedance 80V power supplies may require additional decoupling capacitors to reject power-supply noise. Connect bypass capacitors close to the device pins. This region of operation provides the highest accuracy. Here, the input offset voltage is characterized and measured using a two-step The input circuitry of the INA203, INA204, and method. First, the gain is determined by Equation 1. INA205 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 where: voltage range of the OUT terminal, however, is limited by the voltages on the power-supply pin. VOUT1 = Output Voltage with VSENSE = 100mV VOUT2 = Output Voltage with VSENSE = 20mV V SENSE AND COMMON-MODE VOLTAGE Then the offset voltage is measured at VSENSE = 100mV and referred to the input (RTI) of the current The accuracy of the INA203, INA204, and INA205 shunt monitor, as shown in Equation 2. 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. Figure 30. INA20x Basic Connection 11 Submit Documentation Feedback |
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