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INA202AIDGKT Datasheet(PDF) 11 Page - Burr-Brown (TI) |
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INA202AIDGKT Datasheet(HTML) 11 Page - Burr-Brown (TI) |
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11 / 19 page  INA200 INA201 INA202 SBOS374 − NOVEMBER 2006 www.ti.com 11 In the Typical Characteristics, the Output Error vs Common-Mode Voltage curve 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. Normal Case 2: VSENSE ≥ 20mV, VCM < VS This region of operation has slightly less accuracy than Normal Case 1 as a result of the common-mode operating area in which the part functions, as seen in the Output Error vs Common-Mode Voltage curve. As noted, for this graph VS = 12V; for VCM < 12V, the Output Error increases as VCM becomes less than 12V, with a typical maximum error of 0.005% at the most negative VCM = −16V. Low VSENSE Case 1: VSENSE < 20mV, −16V ≤ VCM < 0; and Low VSENSE Case 3: VSENSE < 20mV, VS < VCM ≤ 80V Although the INA200 family of devices are not designed for accurate operation in either of these regions, some applications are exposed to these conditions. For example, when monitoring power supplies that are switched on and off while VS is still applied to the INA200, INA201, or INA202, it is important to know what the behavior of the devices will be in these regions. As VSENSE approaches 0mV, in these VCM regions, the device output accuracy degrades. A larger-than-normal offset can appear at the current shunt monitor output with a typical maximum value of VOUT = 300mV for VSENSE = 0mV. As VSENSE approaches 20mV, VOUT returns to the expected output value with accuracy as specified in the Electrical Characteristics. Figure 3 illustrates this effect using the INA202 (Gain = 100). 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 1012 1416 18 V SENSE (mV) 20 Actual Ideal Figure 3. Example for Low VSENSE Cases 1 and 3 (INA202, Gain = 100) Low VSENSE Case 2: VSENSE < 20mV, 0V ≤ VCM ≤ VS This region of operation is the least accurate for the INA200 family. To achieve the wide input common-mode voltage range, these devices use two op amp front ends in parallel. One op amp front end operates in the positive input common-mode voltage range, and the other in the negative input region. For this case, neither of these two internal amplifiers dominates and overall loop gain is very low. Within this region, VOUT approaches voltages close to linear operation levels for Normal Case 2. This deviation from linear operation becomes greatest the closer VSENSE approaches 0V. Within this region, as VSENSE approaches 20mV, device operation is closer to that described by Normal Case 2. Figure 4 illustrates this behavior for the INA202. The VOUT maximum peak for this case is tested by maintaining a constant VS, setting VSENSE = 0mV and sweeping VCM from 0V to VS. The exact VCM at which VOUT peaks during this test varies from part to part, but the VOUT maximum peak is tested to be less than the specified VOUT tested limit. 2.4 2.2 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 20 22 V SENSE (mV) 24 INA202 V OUT Tested Limit (1) VCM2 VCM1 V CM3 V CM4 V CM2,VCM3,and VCM4 illustrate the variance from part to part of the VCM that can cause maximum V OUT with VSENSE < 20mV. V OUT tested limit at V SENSE =0mV, 0 ≤ VCM1 ≤ VS. NOTE: (1) INA200 V OUT Tested Limit = 0.4V. INA201 VOUT Tested Limit = 1V. Ideal Figure 4. Example for Low VSENSE Case 2 (INA202, Gain = 100) SELECTING RS The value chosen for the shunt resistor, RS, depends on the application and is a compromise between small-signal accuracy and maximum permissible voltage loss in the measurement line. High values of RS provide better accuracy at lower 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 range of 50mV to 100mV. Maximum input voltage for accurate measurements is 500mV. TRANSIENT PROTECTION The −16V to +80V common-mode range of the INA200, INA201, and INA202 is ideal for withstanding automotive fault conditions ranging from 12V battery reversal up to +80V transients, since no additional protective components are needed up to those levels. In the event that the INA200, INA201, and INA202 are exposed to transients on the inputs in excess of their ratings, then external transient absorption with semiconductor transient absorbers (such as zeners) will be necessary. Use of |
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