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AD650AD Datasheet(PDF) 6 Page - Analog Devices |
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AD650AD Datasheet(HTML) 6 Page - Analog Devices |
6 / 20 page AD650 Data Sheet Rev. E | Page 6 of 20 PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS VOUT 1 +IN 2 –IN 3 BIBOLAR OFFSET CURRENT 4 OFFSET NULL 14 OFFSET NULL 13 +VS 12 ANALOG GND 11 –VS 5 DIGITAL GND 10 ONE SHOT CAPACITOR 6 COMPARATOR INPUT 9 NC 7 FOUTPUT 8 NC = NO CONNECT AD650 TOP VIEW (Not to Scale) Figure 2. D-14, N-14 Pin Configurations 1 20 19 2 3 4 5 6 7 8 18 17 16 15 14 9 10 11 12 13 NC = NO CONNECT –IN NC BIPOLAR OFFSET CURRENT NC –VS +VS NC ANALOG GND NC DIGITAL GND PIN 1 INDENTFIER AD650 TOP VIEW (Not to scale) Figure 3. P-20 Pin Configuration Table 2. Pin Function Descriptions Pin No. D-14, N-14 P-20 Mnemonic Description 1 2 VOUT Output of Operational Amplifier. The operational amplifier, along with CINT, is used in the integrate stage of the V to F conversion. 2 3 +IN Positive Analog Input. 3 4 –IN Negative Analog Input. 4 6 BIPOLAR OFFSET CURRENT On-Chip Current Source. This can be used in conjunction with an external resistor to remove the operational amplifier’s offset. 5 8 –VS Negative Power Supply Input. 6 9 ONE-SHOT CAPACITOR The Capacitor, COS, is Connected to This Pin. COS determines the time period for the one shot. 7 1, 5, 7, 10, 11, 15, 17 NC No Connect. 8 12 FOUTPUT Frequency Output from AD650. 9 13 COMPARATOR INPUT Input to Comparator. When the input voltage reaches −0.6 V, the one shot is triggered. 10 14 DIGITAL GND Digital Ground. 11 16 ANALOG GND Analog Ground. 12 18 +VS Positive Power Supply Input. 13, 14 19, 20 OFFSET NULL Offset Null Pins. Using an external potentiometer, the offset of the operational amplifier can be removed. |
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