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AD581KH1 Fiches technique(PDF) 10 Page - Analog Devices |
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AD581KH1 Fiches technique(HTML) 10 Page - Analog Devices |
10 / 12 page AD581 Rev. C | Page 10 of 12 10 V reference guarantees a maximum full-scale temperature coefficient of 8 ppm/°C over the commercial range. The 10 V reference also supplies the normal 1 mA bipolar offset current through the 9.95 kΩ bipolar offset resistor. Consequently, the bipolar offset TC depends only on TC matching of the bipolar offset resistor to the input reference resistor and is guaranteed to 3 ppm/°C. 1 18 2 3 4 5 AD7574 (TOP VIEW) AD581 DIGITAL SUPPLY RETURN GROUND INTERTIE ANALOG GROUND ANALOG SUPPLY RETURN R3 1.2k Ω 5% GND +VS VOUT 0.1µF +5V –15V –10V REF R1 1k Ω 10%1 GAIN TRIM1 R2 2k Ω SIGNAL INPUT 0V TO +10V 1R1 AND R2 CAN BE OMITTED IF GAIN TRIM IS NOT REQUIRED. Figure 15. AD581 as −10 V Reference for CMOS ADC PNP LOGIC SWITCHES AND LEVEL SHIFTERS 0.1µF 0.1µF OP1177 OP AMP OUTPUT 5k Ω (8k Ω) A 5k Ω (8k Ω) R4 20k Ω, 15T R3 3.0M Ω 9.950k Ω (15.95k) CONTROL AMP CONTROL AMP SUMMING JUNCTION 100 Ω, 15T R2 GAIN ADJ. 10V VOUT R1 100 Ω, 15T BIPOLAR OFFSET ADJ. GND 19.95k Ω 0.5mA –15V AD565A +15V –15V UNIPOLAR OFFSET ADJ. A = ANALOG GROUND 24 23 22 21 20 19 18 17 16 15 14 13 2 3 11 10 9 12 8 7 2 1 6 4 5 3 A –15V +5V/+15V +15V +VS AD581 Figure 16. Precision 12-Bit DAC |
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