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CDS-1402MC Datasheet(PDF) 7 Page - Murata Power Solutions Inc. |
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CDS-1402MC Datasheet(HTML) 7 Page - Murata Power Solutions Inc. |
7 / 8 page CDS-1402 7 ® ® CALIBRATION PROCEDURE Offset Adjust (Figure 5) Offset and pedestal errors may be compensated for by applying external voltages to pin 1 (OFFSET ADJUST V1) and/ or pin 9 (OFFSET ADJUST V2) using either voltage-output DAC’s or potentiometers configured to appear as voltage sources. 1. Connect pin 8 (S/H2 SUMMING NODE) either directly to pin 7 (S/H1 ROUT) or through a 100 Ohm potentiometer to pin 6 (S/H1 OUT). 2. Tie pins 3 (ANALOG INPUT 1) and 4 (ANALOG INPUT 2) to pin 5 (ANALOG GROUND). 3. Adjust OFFSET ADJUST V1 (while S/H1 is in the hold mode) until pin 6 (S/H1 OUT) equals 0V. 4. Adjust OFFSET ADJUST V2 (while S/H2 is in the hold mode) until pin 22 (V OUT) equals 0V. 5. To negate the effect of output droop on the offset-adjust process, each S/H must be continually switched between its sample and hold modes and adjusted so its output equals zero immediately after going into the hold mode. The sensitivity of the voltage offset adjustments is 5mV per Volt. Pins 1 and 9 should be left open (floating) when not being used for offset adjustment. Gain Matching Adjustment (Differential Gain) between S/H1 and S/H2 The user can adjust the gain matching (differential gain) between S/H1 and S/H2 by leaving pin 7 (S/H1 ROUT) floating (open) and connecting a 100 Ohm potentiometer between pin 6 (S/H1 OUT) and pin 8 (S/H2 SUMMING NODE). Note, offset adjustment should take place before gain matching adjustment. Apply a full-scale input to both pin 3 (ANALOG INPUT 1) and pin 4 (ANALOG INPUT 2). Adjust the 100 Ohm potentio- meter (with both S/H's in the sample mode) until pin 22 (V OUT) is 0V. If gain matching adjustment is not required, leave pin 6 (S/H1 OUT) floating (open) and tie pin 7 (S/H1 ROUT) to pin 8 (S/H2 SUMMING NODE). OFFSET ADJUST V1 1 +5V –5V DO NOT CONNECT 2 ANALOG INPUT 1 3 ANALOG INPUT 2 4 ANALOG GROUND 5 S/H1 OUT 6 S/H1 ROUT 7 S/H2 SUMMING NODE 8 OFFSET ADJUST V2 9 +5V –5V DO NOT CONNECT 10 S/H1 COMMAND 11 S/H2 COMMAND 12 100 Ω 0.1µF 2.2µF +5V + 0.1µF 2.2µF –5V 0.1µF 2.2µF +5V + 24 23 22 21 20 19 18 17 16 15 14 13 ANALOG GROUND V OUT ANALOG GROUND A/D CLOCK 2 A/D CLOCK 2 A/D CLOCK 1 A/D CLOCK 1 +5V DIGITAL SUPPLY DIGITAL GROUND ANALOG GROUND –5V ANALOG SUPPLY +5V ANALOG SUPPLY CDS-1402 Figure 5. CDS-1402 Typical Connection Diagram |
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