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HS-2420RH Datasheet(PDF) 7 Page - Intersil Corporation |
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HS-2420RH Datasheet(HTML) 7 Page - Intersil Corporation |
7 / 8 page 7 HS-2420RH Offset and Gain Adjustment Offset Adjustment The offset voltage of the HS-2420RH may be adjusted using a 100k Ω trim pot, as shown in Figure 15. The recommended adjustment procedure is: 1. Apply 0V to the sample-and-hold input, and a square wave to the S/H control. 2. Adjust the trim pot for 0V output in the hold mode. Gain Adjustment The linear variation in pedestal voltage with sample-and-hold input voltage causes a -0.06% gain error (CH = 1000pF). In some applications (D/A deglitcher, A/D converter) the gain error can be adjusted elsewhere in the system, while in other applications it must be adjusted at the sample-and-hold. The two circuits shown below demonstrate how to adjust gain error at the sample-and-hold. The recommended procedure for adjusting gain error is: 1. Perform offset adjustment. 2. Apply the nominal input voltage that should produce a +10V output. 3. Adjust the trim pot for +10V output in the hold mode. 4. Apply the nominal input voltage that should produce a -10V output. 5. Measure the output hold voltage (V-10 NOMINAL). Adjust the trim pot for an output hold voltage of: V-10 NOMINAL () 10V – () + 2 ------------------------------------------------------------------------ |
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