Datenblatt-Suchmaschine für elektronische Bauteile |
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AD565ASD Datenblatt(PDF) 8 Page - Analog Devices |
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AD565ASD Datenblatt(HTML) 8 Page - Analog Devices |
8 / 11 page AD565A/AD566A REV. D –8– FIGURE 1. UNIPOLAR CONFIGURATION This configuration will provide a unipolar 0 volt to +10 volt output range. In this mode, the bipolar terminal, Pin 8, should be grounded if not used for trimming. 19.95k 20k 0.5mA IREF DAC IOUT = 4 IREF CODE AD565A 9.95k 5k 8k IO 20V SPAN 10V SPAN DAC OUT POWER GND –VEE REF GND BIPOLAR OFF 5k CODE INPUT LSB MSB 10V VCC REF OUT REF IN R2 100 10pF AD509 OUTPUT 0V TO +10V 100 100k +15V –15V R1 50k 2.4k Figure 1. 0 V to +10 V Unipolar Voltage Output STEP I . . . ZERO ADJUST Turn all bits OFF and adjust zero trimmer R1, until the output reads 0.000 volts (1 LSB = 2.44 mV). In most cases this trim is not needed, but Pin 8 should then be connected to Pin 12. STEP II . . . GAIN ADJUST Turn all bits ON and adjust 100 Ω gain trimmer R2, until the output is 9.9976 volts. (Full scale is adjusted to 1 LSB less than nominal full scale of 10.000 volts.) If a 10.2375 V full scale is desired (exactly 2.5 mV/bit), insert a 120 Ω resistor in series with the gain resistor at Pin 10 to the op amp output. FIGURE 2. BIPOLAR CONFIGURATION This configuration will provide a bipolar output voltage from –5.000 to +4.9976 volts, with positive full scale occurring with all bits ON (all 1s). 19.95k 20k 0.5mA IREF DAC IOUT = 4 IREF CODE AD565A 9.95k 5k 8k IO 20V SPAN 10V SPAN DAC OUT POWER GND –VEE REF GND BIPOLAR OFF 5k CODE INPUT LSB MSB 10V VCC REF OUT REF IN R2 100 10pF AD509 OUTPUT –5V TO +5V 2.4k R1 100 Figure 2. ±5 V Bipolar Voltage Output STEP I . . . OFFSET ADJUST Turn OFF all bits. Adjust 100 Ω trimmer R1 to give –5.000 volts output. STEP II . . . GAIN ADJUST Turn ON All bits. Adjust 100 Ω gain trimmer R2 to give a read- ing of +4.9976 volts. Please note that it is not necessary to trim the op amp to obtain full accuracy at room temperature. In most bipolar situations, an op amp trim is unnecessary unless the untrimmed offset drift of the op amp is excessive. FIGURE 3. OTHER VOLTAGE RANGES The AD565A can also be easily configured for a unipolar 0 volt to +5 volt range or ±2.5 volt and ±10 volt bipolar ranges by using the additional 5k application resistor provided at the 20 volt span R terminal, Pin 11. For a 5 volt span (0 to +5 or ±2.5), the two 5k 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 either to ground for unipolar or to REF OUT for the bipolar offset either to ground for unipolar or to REF OUT for the bipolar range. For the ±10 volt range (20 volt span) use the 5k resistors in series by connecting only Pin 11 to the op amp output and the bipolar offset connected as shown. The ±10 volt option is shown in Figure 3. 19.95k 20k 0.5mA IREF DAC IOUT = 4 IREF CODE AD565A 9.95k 5k 8k IO 20V SPAN 10V SPAN DAC OUT POWER GND –VEE REF GND BIPOLAR OFF 5k CODE INPUT LSB MSB 10V VCC REF OUT REF IN R2 100 10pF AD509 OUTPUT –10V TO +10V 3.0k R1 100 Figure 3. ±10 V Voltage Output |
Ähnliche Teilenummer - AD565ASD |
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Ähnliche Beschreibung - AD565ASD |
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