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HS-2420RH Datasheet(PDF) 10 Page - Intersil Corporation |
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HS-2420RH Datasheet(HTML) 10 Page - Intersil Corporation |
10 / 13 page 10 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 zero volts to the sample-and-hold input, and a square wave to the S/H control. 2. Adjust the trim pot for zero volts 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 ---------------------------------------------------------------------------- Spec Number 518855 FIGURE 14. HOLD STEP vs INPUT VOLTAGE FIGURE 15. BASIC SAMPLE-AND-HOLD (TOP VIEW) FIGURE 16. INVERTING CONFIGURATION FIGURE 17. NONINVERTING CONFIGURATION +10 +5 -5 -10 -15 -20 -25 -30 -35 -10 -5 +5 +10 DC INPUT VOLTAGE (V) HOLD STEP VOLTAGE (V) CH = 0.1 µF CH = 10,000pF CH = 1000pF CH = 100pF +IN V- 100k Ω OFFSET TRIM ( ±25mV RANGE) OUT -IN V+ CH S/H CONTROL - +- + HS-2420RH -IN +IN OUT S/H CONTROL INPUT RI OUTPUT 0.002RF RF S/H CONTROL INPUT HS-2420RH GAIN ~ -RF RI +IN -IN OUT S/H CONTROL INPUT RI OUTPUT 0.002RI RF S/H CONTROL INPUT HS-2420RH GAIN ~ I + -RF RI |
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