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INA200AIDR Datasheet(PDF) 11 Page - Texas Instruments |
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INA200AIDR Datasheet(HTML) 11 Page - Texas Instruments |
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11 / 27 page  G= V V - OUT1 OUT2 100mV 20mV - V RTI(Referred-To-Input)= OS V OUT1 G - 100mV 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 INA200 INA201 INA202 www.ti.com SBOS374C – NOVEMBER 2006 – REVISED OCTOBER 2010 Normal Case 1: VSENSE ≥ 20mV, VCM ≥ VS larger-than-normal offset can appear at the current shunt monitor output with a typical maximum value of This region of operation provides the highest VOUT = 300mV for VSENSE = 0mV. As VSENSE accuracy. Here, the input offset voltage is approaches 20mV, VOUT returns to the expected characterized and measured using a two-step output value with accuracy as specified in the method. First, the gain is determined by Equation 1. Electrical Characteristics. Figure 27 illustrates this effect using the INA202 (Gain = 100). (1) 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. (2) In the Typical Characteristics, the Output Error vs Common-Mode Voltage curve (Figure 7) shows the highest accuracy for the this region of operation. In this plot, VS = 12V; for VCM ≥ 12V, the output error is Figure 27. Example for Low VSENSE Cases 1 and 3 at its minimum. This case is also used to create the (INA202, Gain = 100) VSENSE ≥ 20mV output specifications in the Electrical Characteristics table. Low VSENSE Case 2: VSENSE < 20mV, 0V ≤ VCM ≤ VS Normal Case 2: VSENSE ≥ 20mV, VCM < VS This region of operation is the least accurate for the This region of operation has slightly less accuracy INA200 family. To achieve the wide input than Normal Case 1 as a result of the common-mode common-mode voltage range, these devices use two operating area in which the part functions, as seen in op amp front ends in parallel. One op amp front end the Output Error vs Common-Mode Voltage curve operates in the positive input common-mode voltage (Figure 7). As noted, for this graph VS = 12V; for VCM range, and the other in the negative input region. For < 12V, the Output Error increases as VCM becomes this case, neither of these two internal amplifiers less than 12V, with a typical maximum error of dominates and overall loop gain is very low. Within 0.005% at the most negative VCM = –16V. this region, VOUT approaches voltages close to linear operation levels for Normal Case 2. This deviation Low VSENSE Case 1: from linear operation becomes greatest the closer VSENSE < 20mV, –16V ≤ VCM < 0; and VSENSE approaches 0V. Within this region, as VSENSE Low VSENSE Case 3: approaches 20mV, device operation is closer to that VSENSE < 20mV, VS < VCM ≤ 80V described by Normal Case 2. Figure 28 illustrates this Although the INA200 family of devices are not behavior for the INA202. The VOUT maximum peak for designed for accurate operation in either of these this case is tested by maintaining a constant VS, regions, some applications are exposed to these setting VSENSE = 0mV and sweeping VCM from 0V to conditions. For example, when monitoring power VS. The exact VCM at which VOUT peaks during this supplies that are switched on and off while VS is still test varies from part to part, but the VOUT maximum applied to the INA200, INA201, or INA202, it is peak is tested to be less than the specified VOUT important to know what the behavior of the devices tested limit. will be in these regions. As VSENSE approaches 0mV, in these VCM regions, the device output accuracy degrades. A Copyright © 2006–2010, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Link(s): INA200 INA201 INA202 |
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