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AD565AJD Datasheet(PDF) 11 Page - Analog Devices |
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AD565AJD Datasheet(HTML) 11 Page - Analog Devices |
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11 / 13 page  AD565A REV. –10– FIGURE 6. OTHER VOLTAGE RANGES The AD566A can also be easily configured for a unipolar 0 V to +5 V range or ±2.5 V and ±10 V bipolar ranges by using the additional 5 k Ω application resistor provided at the 20 V span R terminal, Pin 11. For a 5 V span (0 V to +5 V or ±2.5 V), the two 5 k Ω resistors are used in parallel by shorting Pin 11 to Pin 9 and connecting Pin 10 to the op amp output and the bipolar offset resistor either to ground for unipolar or to VREF for the bipolar range. For the ±10 V range (20 V span), use the 5 kΩ resistors in series by connecting only Pin 11 to the op amp output and the bipolar offset connected as shown. The ±10 V option is shown in Figure 6. Table I. Digital Input Codes DIGITAL INPUT ANALOG OUTPUT MSB LSB Straight Binary Offset Binary Twos Complement * 0 0 0 0 0 0 0 0 0 0 0 0 Zero –FS Zero 0 1 1 1 1 1 1 1 1 1 1 1 Mid Scale – 1 LSB Zero – 1 LSB +FS – 1 LSB 1 0 0 0 0 0 0 0 0 0 0 0 +1/2 FS Zero –FS 1 1 1 1 1 1 1 1 1 1 1 1 +FS – l LSB +FS – 1 LSB Zero – 1 LSB *Inverts the MSB of the offset binary code with an external inverter to obtain twos complement. 19.95k 20k 0.5mA IREF DAC IOUT = 4 IREF CODE AD566A 9.95k 5k 8k IO 20V SPAN 10V SPAN DAC OUT POWER GND –VEE REF GND BIPOLAR OFF 5k CODE INPUT LSB MSB R2 5k 10pF AD509 2.4k 7.5V EREF AD561 –V REF IN R1 5k 14k * THE PARALLEL COMBINATION OF THE BIPOLAR OFFSET RESISTOR AND R3 ESTABLISHES A CURRENT TO BALANCE THE MSB CURRENT. THE EFFECT OF TEMPERATURE COEFFICIENT MISMATCH BETWEEN THE BIPOLAR RESISTOR COMBINATION AND DAC RESISTORS IS EXPANDED ON PREVIOUS PAGE. R3 26k * Figure 6. ±10 V Voltage Output F |
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