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AD1671 Arkusz danych(PDF) 9 Page - Analog Devices |
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AD1671 Arkusz danych(HTML) 9 Page - Analog Devices |
9 / 16 page AD1671 REV. B –9– Table I is a list of grounding and decoupling rules that should be reviewed before laying out a printed circuit board. Table I. Grounding and Decoupling Guidelines Power Supply Decoupling Comment Capacitor Values 0.1 µF (Ceramic) and 1 µF (Tantalum) Surface Mount Chip Capacitors Recommended to Reduce Lead Inductance Capacitor Locations Directly at Positive and Negative Supply Pins to Common Ground Plane Reference (REF OUT) Capacitor Value 1 µF (Tantalum) to ACOM Grounding Analog Ground Ground Plane or Wide Ground Return Connected to the Analog Power Supply Reference Ground Critical Common Connections (REF COM) Should be Star Connected to REF COM (as Shown in Figure 8) Digital Ground Ground Plane or Wide Ground Return Connected to the Digital Power Supply Analog and Digital Ground Connected Together Once at the AD1671 UNIPOLAR (0 V TO +5 V) CALIBRATION The AD1671 is factory trimmed to minimize offset, gain and linearity errors. In some applications the offset and gain errors of the AD1671 need to be externally adjusted to zero. This is accomplished by trimming the voltage at AIN2 (Pin 22). The circuit in Figure 9 is recommended for calibrating offset and gain errors of the AD1671 when configured in the 0 V to +5 V input range. If the offset trim resistor R1 is used, it should be trimmed as follows, although a different offset can be set for a particular system requirement. This circuit will give approxi- mately ±5 mV of offset trim range. Nominally the AD1671 is intended to have a 1/2 LSB offset so that the exact analog input for a given code will be in the middle of that code (halfway be- tween the transitions to the codes above it and below it). Thus, the first transition (from 0000 0000 0000 to 0000 0000 0001) will occur for an input level of +1/2 LSB (0.61 mV for 5 V range). The gain trim is done by applying a signal 1 1/2 LSBs below the nominal full scale (4.998 V for a 5 V range). Trim R2 to give the last transition (1111 1111 1110 to 1111 1111 1111). This circuit will give approximately ±0.5% FS of adjustment range. R2 50 Ω GAIN ADJ AIN1 AIN2 5k 5k SHA OUT BPO/UPO AD1671 REF IN REF OUT SHA 1µF 50k +5V –5V OFFSET ADJ R1 10k 25 Ω 0 TO +5V VIN Figure 9. Unipolar (0 V to +5 V) Calibration BIPOLAR ( 5 V) CALIBRATION The connections for the bipolar ±5 V input range is shown in Figure 10. R2 50 Ω GAIN ADJ AIN1 AIN2 5k 5k SHA OUT BPO/UPO AD1671 REF IN REF OUT SHA 1µF 50k +5V –5V OFFSET ADJ R1 10k 25 Ω VIN –5V TO +5V Figure 10. Bipolar ( ±5 V) Calibration Bipolar calibration is similar to unipolar calibration. First, a sig- nal 1/2 LSB above negative full scale (–4.9988 V) is applied and R1 is trimmed to give the first transition (0000 0000 0000 to 0000 0000 0001). Then a signal 1 1/2 LSB below positive full scale (+4.9963 V) is applied and R2 is trimmed to give the last transition (1111 1111 1110 to 1111 1111 1111). |
Podobny numer części - AD1671_15 |
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Podobny opis - AD1671_15 |
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