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AD566A Datasheet(PDF) 9 Page - Analog Devices |
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AD566A Datasheet(HTML) 9 Page - Analog Devices |
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9 / 12 page  AD565A/AD566A REV. E –9– CONNECTING THE AD566A FOR BUFFERED VOLTAGE OUTPUT The standard current-to-voltage conversion connections using an operational amplifier are shown in Figures 4, 5, and 6 with the preferred trimming techniques. If a low offset operational amplifier (OP77, AD741L, OP07) is used, excellent performance can be obtained in many situations without trimming (an op amp with less than 0.5 mV max offset voltage should be used to keep offset errors below 1/2 LSB). If a 50 Ω fixed resistor is substituted for the 100 Ω trimmer, unipolar zero typically is within ±1/2 LSB (plus op amp offset), and full-scale accuracy is within 0.1% (0.25% max). Substituting a 50 Ω resistor for the 100 Ω bipolar offset trimmer gives a bipolar zero error typically within ±2 LSB (0.05%). The AD509 is recommended for buffered voltage-output applications that require a settling time to ±1/2 LSB of 1 µs. The feedback capacitor is shown with the optimum value for each application; this capacitor is required to compensate for the 25 pF DAC output capacitance. FIGURE 4. UNIPOLAR CONFIGURATION This configuration provides a unipolar 0 V to 10 V output range. In this mode, the bipolar terminal, Pin 7, should be grounded if not used for trimming. 100k +15V –15V R1 50k 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 100 10pF AD509 2.4k 100 10V EREF AD561 +V REF IN Figure 4. 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 V (1 LSB = 2.44 mV). In most cases, this trim is not needed, but Pin 7 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 V. (Full scale is adjusted to 1 LSB less than nominal full scale of 10.000 V.) 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 5. BIPOLAR CONFIGURATION This configuration provides a bipolar output voltage from –5.000 V to +4.9976 V, with positive full scale occurring with all bits ON (all 1s). 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 100 10pF AD509 2.4k 10V EREF AD561 +V REF IN R1 100 Figure 5. ±5 V Bipolar Voltage Output STEP I . . . OFFSET ADJUST Turn OFF all bits. Adjust 100 Ω trimmer R1 to give –5.000 output V. STEP II . . . GAIN ADJUST Turn ON all bits. Adjust 100 Ω gain trimmer R2 to give a read- ing of +4.9976 V. 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. |
Similar Part No. - AD566A_15 |
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Similar Description - AD566A_15 |
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