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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LTC1404CS8 датащи(PDF) 14 Page - Linear Technology |
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LTC1404CS8 датащи(HTML) 14 Page - Linear Technology |
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14 / 24 page  14 LTC1404 APPLICATIONS INFORMATION Figure 8. LTC1404 Unipolar Transfer Characteristics INPUT VOLTAGE (V) 0V FS – 1LSB 1404 F08 111...111 111...110 111...101 111...100 000...000 000...001 000...010 000...011 1 LSB UNIPOLAR ZERO 1LSB = FS 4096 4.096 4096 = Figure 10b. LTC1404 Offset and Full-Scale Adjust Circuit 1404 F10b – + R2 10k R9 20 Ω R4 100k R5 4.3k FULL-SCALE ADJUST R3 100k R6 400 Ω R1 10k 10k ANALOG INPUT 0V TO 4.096V A1 5V R8 10k OFFSET ADJUST R7 100k 5V AIN LTC1404 Bipolar Offset and Full-Scale Error Adjustments Bipolar offset and full-scale errors are adjusted in a similar fashion to the unipolar case. Bipolar offset error adjust- ment is achieved by applying an input voltage of – 0.5mV (– 0.5LSB) to the input in Figure 10c and adjusting the op amp until the ADC output code flickers between 0000 0000 0000 and 1111 1111 1111. For full-scale adjustment, an input voltage of 2.0465V (FS – 1.5LSBs) is applied to the input and R5 is adjusted until the output code flickers between 0111 1111 1110 and 0111 1111 1111. 1404 F10c – + R2 10k R4 100k R5 4.3k FULL-SCALE ADJUST R3 100k R6 200 Ω R1 10k ANALOG INPUT ±2.048V A1 R8 20k OFFSET ADJUST R7 100k 5V –5V AIN LTC1404 Figure 10c. LTC1404 Bipolar Offset and Full-Scale Adjust Circuit Figure 9. LTC1404 Bipolar Transfer Characteristics INPUT VOLTAGE (V) 0V –1 LSB 1404 F09 011...111 011...110 000...001 000...000 100...000 100...001 111...110 1 LSB BIPOLAR ZERO 111...111 FS/2 – 1LSB –FS/2 1404 F10a – + R2 10k R3 10k R1 50 Ω R4 100 Ω FULL-SCALE ADJUST VIN A1 LTC1404 AIN GND ADDITIONAL PINS OMITTED FOR CLARITY ±20LSB TRIM RANGE Figure 10a. LTC1404 Full-Scale Adjust Circuit |
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