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LM363H-500 Datasheet(PDF) 11 Page - National Semiconductor (TI) |
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LM363H-500 Datasheet(HTML) 11 Page - National Semiconductor (TI) |
11 / 22 page Application Hints (Continued) Because the LM363’s offset voltage is so low to begin with offset nulling has a negligible effect on offset temperature drift For example zeroing a 100 mV offset assuming external resistor TC of 200 ppm C and worst-case internal resistor TC results in an additional drift component of 008 mV C For this reason drift specifications are guaranteed with or without external offset nulling GAIN ADJUSTMENT Gain may be increased by adding an external voltage divid- er between output force and sense and reference the pre- ferred connection is shown in Figure 4 Since both the sense and reference pins look like 50 kX (g20 kX)toVb impedances presented to both pins must be equal to avoid offset error For example a 100X imbalance can create a worst-case output offset of 50 mV creating an input-re- ferred error of 5 mV at Ge10 or 50 mVatGe1000 Increasing gain this way increases output offset error An LM363H-100 may have an output offset of 5 mV resulting in input referred offset component of 50 mV Raising the gain to 200 yields a 10 mV error at the output and changes input referred error by an additional 50 mV External resistors connected to the reference and sense pins can only increase the gain If ultra-low output imped- ance is not critical the technique in Figure 5 can be used to trim the gain to nominal value Alternatively the VOS adjust- ment terminals on the 16-pin package may be used to trim the gain ( Figure 10b ) TLH5609 – 12 R1 and R2 should be as low as possible to avoid errors due to 50 kX input impedance of reference and sense pins Total resistance (R2a2R1) should be above 4 kX however to prevent excessive load on the LM363 output The exact formula for calculating gain (G) is GeGO 1a2R1R2aR150kJ GOepreset gain The last term may be ignored in applications where gain accuracy is not critical The table below gives suggested values for R1 and R2 along with the calculated error due to ‘‘closest value’’ standard 1% resistors Total gain error tolerance includes contributions from LM363 GO error and resistor tolerance (g1%) and works out to approximately 25% in every case Pinout shown is for 16-pin package This same technique can also be used with 8-pin versions Gain Increase 1 5 2 2 5 3 4 5 6789 10 R1 121k 121k 2k 2k 178k 2k 249k 294k 348k 392k 442k R2 5k 249k 274k 205k 121k 1k 1k 1k 1k 1k 1k Error (typ) a 06% b 02% 0 b 03% b 06% a 08% a 05% b 09% a 04% b 09% b 07% FIGURE 4 Increasing Gain Pinout shown is for 8-pin versions This same technique can also be used with 16-pin version TLH5609 – 13 FIGURE 5 Adjusting Gain Alternate Technique 11 |
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