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INA270AID Datasheet(PDF) 10 Page - Burr-Brown (TI) |
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INA270AID Datasheet(HTML) 10 Page - Burr-Brown (TI) |
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10 / 17 page  www.ti.com Normal Case 2: VSENSE ≥ 20mV, VCM < VS ACCURACY VARIATIONS AS A RESULT OF Low VSENSE Case 1: Normal Case 1: VSENSE ≥ 20mV, VCM ≥ VS G= V V - OUT1 OUT2 100mV 20mV - (1) V RTI(Referred-To-Input)= OS V OUT1 G - 100mV (2) 2.0 1.8 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0 0 2 4 6 8 10 12 14 16 18 V (mV) SENSE 20 Actual Ideal INA270 INA271 SBOS381A – FEBRUARY 2007 – REVISED APRIL 2007 V SENSE AND COMMON-MODE VOLTAGE This region of operation has slightly less accuracy than Normal Case 1 as a result of the common-mode The accuracy of the INA270 and INA271 current operating area in which the part functions, as seen in shunt monitors is a function of two main variables: the Output Error vs Common-Mode Voltage curve VSENSE (VIN+ – VIN–) and common-mode voltage, (Figure 6). As noted, for this graph VS = 12V; for VCM VCM, relative to the supply voltage, VS. VCM is < 12V, the Output Error increases as VCM becomes expressed as (VIN+ + VIN–)/2; however, in practice, less than 12V, with a typical maximum error of VCM is seen as the voltage at VIN+ because the 0.005% at the most negative VCM = –16V. voltage drop across VSENSE is usually small. This section addresses the accuracy of these specific operating regions: VSENSE < 20mV, –16V ≤ VCM < 0; and Low VSENSE Case 3: Normal Case 1: VSENSE ≥ 20mV, VCM ≥ VS VSENSE < 20mV, VS < VCM ≤ 80V Normal Case 2: VSENSE ≥ 20mV, VCM < VS Although the INA270 family of devices are not Low VSENSE Case 1: designed for accurate operation in either of these VSENSE < 20mV, –16V ≤ VCM < 0 regions, some applications are exposed to these Low VSENSE Case 2: conditions. For example, when monitoring power VSENSE < 20mV, 0V ≤ VCM ≤ VS supplies that are switched on and off while VS is still applied to the INA270 or INA271, it is important to Low VSENSE Case 3: know what the behavior of the devices will be in VSENSE < 20mV, VS < VCM ≤ 80V these regions. As VSENSE approaches 0mV, in these VCM regions, the device output accuracy degrades. A This region of operation provides the highest larger-than-normal offset can appear at the current accuracy. Here, the input offset voltage is shunt monitor output with a typical maximum value of characterized and measured using a two-step VOUT = 60mV for VSENSE = 0mV. As VSENSE method. First, the gain is determined by Equation 1. approaches 20mV, VOUT returns to the expected output value with accuracy as specified in the Electrical Characteristics. Figure 17 shows this effect using the INA271 (Gain = 20). 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. In the Typical Characteristics, the Output Error vs Common-Mode Voltage curve (Figure 6) shows the highest accuracy for the this region of operation. In this plot, VS = 12V; for VCM ≥ 12V, the output error is at its minimum. This case is also used to create the VSENSE ≥ 20mV output specifications in the Electrical Characteristics table. Figure 17. Example for Low VSENSE Cases 1 and 3 (INA271, Gain = 20) 10 Submit Documentation Feedback |
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