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ADDAC85MILCBII8 데이터시트(PDF) 10 Page - Analog Devices |
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ADDAC85MILCBII8 데이터시트(HTML) 10 Page - Analog Devices |
10 / 16 page REV. B ADDAC80/ADDAC85/ADDAC87 –10– 1 F 3.9M 1 F 0.01 F 10M +VS 10k TO 100k +VS –VS 10k TO 100k –VS 1 2 3 4 5 6 7 8 9 10 11 12 12-BIT RESISTOR LADDER NETWORK AND CURRENT SWITCHES REF CONTROL CIRCUIT 6.3k 2k 3k 5k 24 23 22 21 20 19 18 17 16 15 14 13 Figure 6. External Adjustment and Voltage Supply Connection Diagram, Current Model Offset Adjustment For unipolar (CSB) configurations, apply the digital input code that should produce zero potential output and adjust the OFFSET potentiometer for zero output. For bipolar (COB, CTC) configurations, apply the digital input code that should produce the maximum negative output voltage. Example: If the FULL SCALE RANGE is connected for 20 V, the maximum negative output voltage is –10 V. See Table II for corresponding codes. Gain Adjustment For either unipolar or bipolar configurations, apply the digital input that should give the maximum positive voltage output. Adjust the GAIN potentiometer for this positive full-scale voltage. See Table II for positive full-scale voltages. 12-BIT RESISTOR LADDER NETWORK AND CURRENT SWITCHES REF CONTROL CIRCUIT 1 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 20 19 18 17 16 15 14 13 6.3k 5k 5k + – 1 F 1 F 0.01 F 10M +VS 10k TO 100k +VS –VS 10k TO 100k –VS 3.9M Figure 7. External Adjustment and Voltage Supply Connection Diagram, Voltage Model 10M 270k 270k 7.8k 3.9M 180k 180k 10k Figure 8. Equivalent Resistances Table II. Digital Input Analog Output Digital Input Analog Output 12-Bit Resolution Voltage* Current MSB LSB 0 to +10 V 10 V 0 to –2 mA 1 mA 0 0 0 0 0 0 0 0 0 0 0 0 +9.9976 V +9.9951 V –1.9995 mA –0.9995 mA 0 1 1 1 1 1 1 1 1 1 1 1 +5.0000 V 0.0000 V –1.0000 mA 0.0000 mA 1 0 0 0 0 0 0 0 0 0 0 0 +4.9976 V 4.88 mV –0.9995 mA +0.0005 mA 1 1 1 1 1 1 1 1 1 1 1 1 0.0000 V –10.0000 V 0.0000 mA –1.00 mA l LSB 2.44 mV –0.0049 V 0.488 µA 0.488 µA *To obtain values for other binary ranges 0 to 5 V range: divide 0 to 10 values by 2; ± 5 V range: divide ± 10 V range values by 2; ±2.5 V range: divide ±10 V range values by 4. |
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